A cone-shaped structure in plants made up of a mass of meristematic cells that covers and protects the tip of a growing root. It is the putative site of gravity sensing in plant roots.
The usually underground portions of a plant that serve as support, store food, and through which water and mineral nutrients enter the plant. (From American Heritage Dictionary, 1982; Concise Dictionary of Biology, 1990)
The directional growth of organisms in response to gravity. In plants, the main root is positively gravitropic (growing downwards) and a main stem is negatively gravitropic (growing upwards), irrespective of the positions in which they are placed. Plant gravitropism is thought to be controlled by auxin (AUXINS), a plant growth substance. (From Concise Dictionary of Biology, 1990)
Azoles of one NITROGEN and two double bonds that have aromatic chemical properties.
Proteins found in plants (flowers, herbs, shrubs, trees, etc.). The concept does not include proteins found in vegetables for which VEGETABLE PROTEINS is available.
Expanded structures, usually green, of vascular plants, characteristically consisting of a bladelike expansion attached to a stem, and functioning as the principal organ of photosynthesis and transpiration. (American Heritage Dictionary, 2d ed)
A plant genus of the family BRASSICACEAE that contains ARABIDOPSIS PROTEINS and MADS DOMAIN PROTEINS. The species A. thaliana is used for experiments in classical plant genetics as well as molecular genetic studies in plant physiology, biochemistry, and development.
Acetic acid derivatives of the heterocyclic compound indole. (Merck Index, 11th ed)
The functional hereditary units of PLANTS.
Process whereby a cell, bodily structure, or organism (animal or plant) receives or detects a gravity stimulus. Gravity sensing plays an important role in the directional growth and development of an organism (GRAVITROPISM).
A group of plant cells that are capable of dividing infinitely and whose main function is the production of new growth at the growing tip of a root or stem. (From Concise Dictionary of Biology, 1990)
New immature growth of a plant including stem, leaves, tips of branches, and SEEDLINGS.
A plant species of the family POACEAE. It is a tall grass grown for its EDIBLE GRAIN, corn, used as food and animal FODDER.
Symbiotic combination (dual organism) of the MYCELIUM of FUNGI with the roots of plants (PLANT ROOTS). The roots of almost all higher plants exhibit this mutually beneficial relationship, whereby the fungus supplies water and mineral salts to the plant, and the plant supplies CARBOHYDRATES to the fungus. There are two major types of mycorrhizae: ectomycorrhizae and endomycorrhizae.
Any of the hormones produced naturally in plants and active in controlling growth and other functions. There are three primary classes: auxins, cytokinins, and gibberellins.
Deoxyribonucleic acid that makes up the genetic material of plants.
Proteins that originate from plants species belonging to the genus ARABIDOPSIS. The most intensely studied species of Arabidopsis, Arabidopsis thaliana, is commonly used in laboratory experiments.
Concentrated pharmaceutical preparations of plants obtained by removing active constituents with a suitable solvent, which is evaporated away, and adjusting the residue to a prescribed standard.
A genus of OOMYCETES in the family Saprolegniaceae. It causes root rot in plants and is also a pathogen of FISHES.
The immediate physical zone surrounding plant roots that include the plant roots. It is an area of intense and complex biological activity involving plants, microorganisms, other soil organisms, and the soil.
Nucleic acid structures found on the 5' end of eukaryotic cellular and viral messenger RNA and some heterogeneous nuclear RNAs. These structures, which are positively charged, protect the above specified RNAs at their termini against attack by phosphatases and other nucleases and promote mRNA function at the level of initiation of translation. Analogs of the RNA caps (RNA CAP ANALOGS), which lack the positive charge, inhibit the initiation of protein synthesis.
Knobbed structures formed from and attached to plant roots, especially of LEGUMES, which result from symbiotic infection by nitrogen fixing bacteria such as RHIZOBIUM or FRANKIA. Root nodules are structures related to MYCORRHIZAE formed by symbiotic associations with fungi.
The relationship between two different species of organisms that are interdependent; each gains benefits from the other or a relationship between different species where both of the organisms in question benefit from the presence of the other.
A group of compounds that are derivatives of oxo-pyrrolidines. A member of this group is 2-oxo pyrrolidine, which is an intermediate in the manufacture of polyvinylpyrrolidone. (From Merck Index, 11th ed)
The gourd plant family of the order Violales, subclass Dilleniidae, class Magnoliopsida. It is sometimes placed in its own order, Cucurbitales. 'Melon' generally refers to CUCUMIS; CITRULLUS; or MOMORDICA.
A plant genus of the family FABACEAE. The gums and tanning agents obtained from Acacia are called GUM ARABIC. The common name of catechu is more often used for Areca catechu (ARECA).
Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control of gene action in plants.
Processes orchestrated or driven by a plethora of genes, plant hormones, and inherent biological timing mechanisms facilitated by secondary molecules, which result in the systematic transformation of plants and plant parts, from one stage of maturity to another.
A technique for growing plants in culture solutions rather than in soil. The roots are immersed in an aerated solution containing the correct proportions of essential mineral salts. (From Concise Dictionary of Biology, 1990)
A variable annual leguminous vine (Pisum sativum) that is cultivated for its rounded smooth or wrinkled edible protein-rich seeds, the seed of the pea, and the immature pods with their included seeds. (From Webster's New Collegiate Dictionary, 1973)
A thin layer of cells forming the outer integument of seed plants and ferns. (Random House Unabridged Dictionary, 2d ed)
Acceleration produced by the mutual attraction of two masses, and of magnitude inversely proportional to the square of the distance between the two centers of mass. It is also the force imparted by the earth, moon, or a planet to an object near its surface. (From NASA Thesaurus, 1988)
Members of the group of vascular plants which bear flowers. They are differentiated from GYMNOSPERMS by their production of seeds within a closed chamber (OVARY, PLANT). The Angiosperms division is composed of two classes, the monocotyledons (Liliopsida) and dicotyledons (Magnoliopsida). Angiosperms represent approximately 80% of all known living plants.
A plant family of the order Solanales, subclass Asteridae. Among the most important are POTATOES; TOMATOES; CAPSICUM (green and red peppers); TOBACCO; and BELLADONNA.
The unconsolidated mineral or organic matter on the surface of the earth that serves as a natural medium for the growth of land plants.
Plants or plant parts which are harmful to man or other animals.
The part of a tooth from the neck to the apex, embedded in the alveolar process and covered with cementum. A root may be single or divided into several branches, usually identified by their relative position, e.g., lingual root or buccal root. Single-rooted teeth include mandibular first and second premolars and the maxillary second premolar teeth. The maxillary first premolar has two roots in most cases. Maxillary molars have three roots. (Jablonski, Dictionary of Dentistry, 1992, p690)
Parts of plants that usually grow vertically upwards towards the light and support the leaves, buds, and reproductive structures. (From Concise Dictionary of Biology, 1990)
The directional growth of an organism in response to an external stimulus such as light, touch, or gravity. Growth towards the stimulus is a positive tropism; growth away from the stimulus is a negative tropism. (From Concise Dictionary of Biology, 1990)
Basic functional unit of plants.

The influence of microgravity and spaceflight on columella cell ultrastructure in starch-deficient mutants of Arabidopsis. (1/58)

The ultrastructure of root cap columella cells was studied by morphometric analysis in wild-type, a reduced-starch mutant, and a starchless mutant of Arabidopsis grown in microgravity (F-microgravity) and compared to ground 1g (G-1g) and flight 1g (F-1g) controls. Seedlings of the wild-type and reduced-starch mutant that developed during an experiment on the Space Shuttle (both the F-microgravity samples and the F-lg control) exhibited a decreased starch content in comparison to the G-1g control. These results suggest that some factor associated with spaceflight (and not microgravity per se) affects starch metabolism. Elevated levels of ethylene were found during the experiments on the Space Shuttle, and analysis of ground controls with added ethylene demonstrated that this gas was responsible for decreased starch levels in the columella cells. This is the first study to use an on-board centrifuge as a control when quantifying starch in spaceflight-grown plants. Furthermore, our results show that ethylene levels must be carefully considered and controlled when designing experiments with plants for the International Space Station.  (+info)

POLTERGEIST functions to regulate meristem development downstream of the CLAVATA loci. (2/58)

Mutations at the CLAVATA loci (CLV1, CLV2 and CLV3) result in the accumulation of undifferentiated cells at the shoot and floral meristems. We have isolated three mutant alleles of a novel locus, POLTERGEIST (POL), as suppressors of clv1, clv2 and clv3 phenotypes. All pol mutants were nearly indistinguishable from wild-type plants; however, pol mutations provided recessive, partial suppression of meristem defects in strong clv1 and clv3 mutants, and nearly complete suppression of weak clv1 mutants. pol mutations partially suppressed clv2 floral and pedicel defects in a dominant fashion, and almost completely suppressed clv2 phenotypes in a recessive manner. These observations, along with dominant interactions observed between the pol and wuschel (wus) mutations, indicate that POL functions as a critical regulator of meristem development downstream of the CLV loci and redundantly with WUS. Consistent with this, pol mutations do not suppress clv3 phenotypes by altering CLV1 receptor activation.  (+info)

Restoration of gravitropic sensitivity in starch-deficient mutants of Arabidopsis by hypergravity. (3/58)

Despite the extensive study of plant gravitropism, there have been few experiments which have utilized hypergravity as a tool to investigate gravisensitivity in flowering plants. Previous studies have shown that starch-deficient mutants of Arabidopsis are less sensitive to gravity compared to the wild-type (WT). In this report, the question addressed was whether hypergravity could restore the sensitivity of starch-deficient mutants of Arabidopsis. The strains examined include a WT, a starchless mutant and a reduced-starch mutant. Vertical orientation studies with dark-grown seedlings indicate that increased centrifugal acceleration improves orientation relative to the acceleration vector for all strains, even the WT. For starchless roots, growth of seedlings under constant 5 g acceleration was required to restore orientation to the level of the WT at 1 g. In contrast, approximately 10 g was required to restore the orientation of the starchless mutant hypocotyls to a WT level at 1 g. Examination of plastid position in root cap columella cells of the starchless mutant revealed that the restoration of gravitropic sensitivity was correlated with the sedimentation of plastids toward the distal cell wall. Even in WT plants, hypergravity caused greater sedimentation of plastids and improved gravitropic capability. Collectively, these experiments support the hypothesis of a statolith-based system of gravity perception in plants. As far as is known, this is the first report to use hypergravity to study the mechanisms of gravitropism in Arabidopsis.  (+info)

Root mucilage from pea and its utilization by rhizosphere bacteria as a sole carbon source. (4/58)

Plant roots secrete a complex polysaccharide mucilage that may provide a significant source of carbon for microbes that colonize the rhizosphere. High molecular weight mucilage was separated by high-pressure liquid chromatography gel filtration from low molecular weight components of pea root exudate. Purified pea root mucilage generally was similar in sugar and glycosidic linkage composition to mucilage from cowpea, wheat, rice, and maize, but appeared to contain an unusually high amount of material that was similar to arabinogalactan protein. Purified pea mucilage was used as the sole carbon source for growth of several pea rhizosphere bacteria, including Rhizobium leguminosarum 8401 and 4292, Burkholderia cepacia AMMD, and Pseudomonas fluorescens PRA25. These species grew on mucilage to cell densities of three- to 25-fold higher than controls with no added carbon source, with cell densities of 1 to 15% of those obtained on an equal weight of glucose. Micromolar concentrations of nod gene-inducing flavonoids specifically stimulated mucilage-dependent growth of R. leguminosarum 8401 to levels almost equaling the glucose controls. R. leguminosarum 8401 was able to hydrolyze p-nitrophenyl glycosides of various sugars and partially utilize a number of purified plant polysaccharides as sole carbon sources, indicating that R. leguminosarum 8401 can make an unexpected variety of carbohydrases, in accordance with its ability to extensively utilize pea root mucilage.  (+info)

The role of the distal elongation zone in the response of maize roots to auxin and gravity. (5/58)

We used a video digitizer system to (a) measure changes in the pattern of longitudinal surface extension in primary roots of maize (Zea mays L.) upon application and withdrawal of auxin and (b) compare these patterns during gravitropism in control roots and roots pretreated with auxin. Special attention was paid to the distal elongation zone (DEZ), arbitrarily defined as the region between the meristem and the point within the elongation zone at which the rate of elongation reaches 0.3 of the peak rate. For roots in aqueous solution, the basal limit of the DEZ is about 2.5 mm behind the tip of the root cap. Auxin suppressed elongation throughout the elongation zone, but, after 1 to 3 h, elongation resumed, primarily as a result of induction of rapid elongation in the DEZ. Withdrawal of auxin during the period of strong inhibition resulted in exceptionally rapid elongation attributable to the initiation of rapid elongation in the DEZ plus recovery in the main elongation zone. Gravistimulation of auxin-inhibited roots induced rapid elongation in the DEZ along the top of the root. This resulted in rapid gravitropism even though the elongation rate of the root was zero before gravistimulation. The results indicate that cells of the DEZ differ from cells in the bulk of the elongation zone with respect to auxin sensitivity and that DEZ cells play an important role in gravitropism.  (+info)

Interactions between red light, abscisic acid, and calcium in gravitropism. (6/58)

The effect of red light on orthogravitropism of Merit corn (Zea mays L.) roots has been attributed to its effects on the transduction phase of gravitropism (AC Leopold, SH Wettlaufer [1988] Plant Physiol 87:803-805). In an effort to characterize the orthogravitropic transduction system, comparative experiments have been carried out on the effects of red light, calcium, and abscisic acid (ABA). The red light effect can be completely satisfied with added ABA (100 micromolar) or with osmotic shock, which is presumed to increase endogenous ABA. The decay of the red light effect is closely paralleled by the decay of the ABA effect. ABA and exogenous calcium show strong additive effects when applied to either Merit or a line of corn which does not require red light for orthogravitropism. Measurements of the ABA content show marked increases in endogenous ABA in the growing region of the roots after red light. The interpretation is offered that red light or ABA may serve to increase the cytoplasmic concentrations of calcium, and that this may be an integral part of orthogravitropic transduction.  (+info)

Springback in root gravitropism. (7/58)

Conditions under which a gravistimulus of Merit corn roots (Zea mays L.) is withdrawn result in a subsequent loss of gravitropic curvature, an effect which we refer to as springback.' This loss of curvature begins within 1 to 10 minutes after removal of the gravistimulus. It occurs regardless of the presence or absence of the root cap. It is insensitive to inhibitors of auxin transport (2,3,5-triiodobenzoic acid, naphthylphthalamic [correction of naphthylphthalmaic] acid) or to added auxin (2,4-dichlorophenoxyacetic acid). Springback is prevented if a clinostat treatment is interjected to neutralize gravistimulation during germination, which suggests that the change in curvature is a response to a memory' effect carried over from a prior gravistimulation.  (+info)

Characterization and distribution of a maize cDNA encoding a peptide similar to the catalytic region of second messenger dependent protein kinases. (8/58)

Maize (Zea mays) roots respond to a variety of environmental stimuli which are perceived by a specialized group of cells, the root cap. We are studying the transduction of extracellular signals by roots, particularly the role of protein kinases. Protein phosphorylation by kinases is an important step in many eukaryotic signal transduction pathways. As a first phase of this research we have isolated a cDNA encoding a maize protein similar to fungal and animal protein kinases known to be involved in the transduction of extracellular signals. The deduced sequence of this cDNA encodes a polypeptide containing amino acids corresponding to 33 out of 34 invariant or nearly invariant sequence features characteristic of protein kinase catalytic domains. The maize cDNA gene product is more closely related to the branch of serine/threonine protein kinase catalytic domains composed of the cyclic-nucleotide- and calcium-phospholipid-dependent subfamilies than to other protein kinases. Sequence identity is 35% or more between the deduced maize polypeptide and all members of this branch. The high structural similarity strongly suggests that catalytic activity of the encoded maize protein kinase may be regulated by second messengers, like that of all members of this branch whose regulation has been characterized. Northern hybridization with the maize cDNA clone shows a single 2400 base transcript at roughly similar levels in maize coleoptiles, root meristems, and the zone of root elongation, but the transcript is less abundant in mature leaves. In situ hybridization confirms the presence of the transcript in all regions of primary maize root tissue.  (+info)

The plant root cap, also known as the calyptra, is the protective tissue found at the extreme tip of the primary root and lateral roots in plants. It consists of a group of cells that encloses and shields the apical meristem, which is the region responsible for the growth and elongation of the root.

The root cap plays a crucial role in guiding the direction of root growth by sensing and responding to environmental stimuli such as gravity, touch, and moisture gradients. As the root grows and penetrates the soil, the root cap cells are constantly worn away and replaced by new cells produced by the underlying meristematic tissue.

In addition to its protective function, the root cap also secretes a slimy mucilage that helps reduce friction between the root and the soil, facilitating the movement of the root through the substrate. This mucilage also contains enzymes and other compounds that aid in the breakdown and uptake of nutrients from the soil.

A plant root is not a medical term per se, but it is a term from botany, which is the study of plants. However, I can certainly provide a definition for you.

Plant roots are the underground organs of a plant that typically grow downward into the soil. They serve several important functions, including:

1. Anchorage: Roots help to stabilize the plant and keep it upright in the ground.
2. Absorption: Roots absorb water and nutrients from the soil, which are essential for the plant's growth and development.
3. Conduction: Roots conduct water and nutrients up to the above-ground parts of the plant, such as the stem and leaves.
4. Vegetative reproduction: Some plants can reproduce vegetatively through their roots, producing new plants from root fragments or specialized structures called rhizomes or tubers.

Roots are composed of several different tissues, including the epidermis, cortex, endodermis, and vascular tissue. The epidermis is the outermost layer of the root, which secretes a waxy substance called suberin that helps to prevent water loss. The cortex is the middle layer of the root, which contains cells that store carbohydrates and other nutrients. The endodermis is a thin layer of cells that surrounds the vascular tissue and regulates the movement of water and solutes into and out of the root. The vascular tissue consists of xylem and phloem, which transport water and nutrients throughout the plant.

Gravitropism is the growth or movement of a plant in response to gravity. It is a type of tropism, which is the growth or movement of an organism in response to a stimulus. In gravitropism, plant cells can sense the direction of gravity and grow or bend towards or away from it. Roots typically exhibit positive gravitropism, growing downwards in response to gravity, while shoots exhibit negative gravitropism, growing upwards against gravity. This growth pattern helps plants establish themselves in their environment and optimize their access to resources such as water and light.

"Pyrroles" is not a medical term in and of itself, but "pyrrole" is an organic compound that contains one nitrogen atom and four carbon atoms in a ring structure. In the context of human health, "pyrroles" often refers to a group of compounds called pyrrol derivatives or pyrrole metabolites.

In clinical settings, "pyrroles" is sometimes used to refer to a urinary metabolite called "pyrrole-protein conjugate," which contains a pyrrole ring and is excreted in the urine. Elevated levels of this compound have been associated with certain psychiatric and behavioral disorders, such as schizophrenia and mood disorders. However, the relationship between pyrroles and these conditions is not well understood, and more research is needed to establish a clear medical definition or diagnostic criteria for "pyrrole disorder" or "pyroluria."

"Plant proteins" refer to the proteins that are derived from plant sources. These can include proteins from legumes such as beans, lentils, and peas, as well as proteins from grains like wheat, rice, and corn. Other sources of plant proteins include nuts, seeds, and vegetables.

Plant proteins are made up of individual amino acids, which are the building blocks of protein. While animal-based proteins typically contain all of the essential amino acids that the body needs to function properly, many plant-based proteins may be lacking in one or more of these essential amino acids. However, by consuming a variety of plant-based foods throughout the day, it is possible to get all of the essential amino acids that the body needs from plant sources alone.

Plant proteins are often lower in calories and saturated fat than animal proteins, making them a popular choice for those following a vegetarian or vegan diet, as well as those looking to maintain a healthy weight or reduce their risk of chronic diseases such as heart disease and cancer. Additionally, plant proteins have been shown to have a number of health benefits, including improving gut health, reducing inflammation, and supporting muscle growth and repair.

I believe there may be a slight misunderstanding in your question. "Plant leaves" are not a medical term, but rather a general biological term referring to a specific organ found in plants.

Leaves are organs that are typically flat and broad, and they are the primary site of photosynthesis in most plants. They are usually green due to the presence of chlorophyll, which is essential for capturing sunlight and converting it into chemical energy through photosynthesis.

While leaves do not have a direct medical definition, understanding their structure and function can be important in various medical fields, such as pharmacognosy (the study of medicinal plants) or environmental health. For example, certain plant leaves may contain bioactive compounds that have therapeutic potential, while others may produce allergens or toxins that can impact human health.

'Arabidopsis' is a genus of small flowering plants that are part of the mustard family (Brassicaceae). The most commonly studied species within this genus is 'Arabidopsis thaliana', which is often used as a model organism in plant biology and genetics research. This plant is native to Eurasia and Africa, and it has a small genome that has been fully sequenced. It is known for its short life cycle, self-fertilization, and ease of growth, making it an ideal subject for studying various aspects of plant biology, including development, metabolism, and response to environmental stresses.

Indole-3-acetic acid (IAA) is not exactly a medical term, but rather a scientific term used in the field of biochemistry and physiology. It is a type of auxin, which is a plant hormone that regulates various growth and development processes in plants. IAA is the most abundant and best-studied natural auxin.

Medically, indole-3-acetic acid may be mentioned in the context of certain medical conditions or treatments related to plants or plant-derived substances. For example, some research has investigated the potential use of IAA in promoting wound healing in plants or in agricultural applications. However, it is not a substance that is typically used in medical treatment for humans or animals.

A gene in plants, like in other organisms, is a hereditary unit that carries genetic information from one generation to the next. It is a segment of DNA (deoxyribonucleic acid) that contains the instructions for the development and function of an organism. Genes in plants determine various traits such as flower color, plant height, resistance to diseases, and many others. They are responsible for encoding proteins and RNA molecules that play crucial roles in the growth, development, and reproduction of plants. Plant genes can be manipulated through traditional breeding methods or genetic engineering techniques to improve crop yield, enhance disease resistance, and increase nutritional value.

'Gravity sensing' is not a term typically used in medical definitions. However, in the context of physiology and neuroscience, it refers to the ability of certain cells or organisms to detect and respond to changes in gravity. This is particularly relevant in the vestibular system, which is responsible for maintaining balance and spatial orientation.

In the human body, gravity sensing in the vestibular system is achieved through the detection of head movement and position by hair cells located in the inner ear. These hair cells are embedded in a gel-like structure within the semicircular canals and the utricle and saccule of the vestibular apparatus. When the head moves, the fluid within these structures moves as well, bending the hair cells and stimulating nerve impulses that are sent to the brain. The brain then interprets these signals to help us maintain our balance and spatial orientation.

Therefore, while not a traditional medical definition, gravity sensing is an important concept in understanding how the body maintains its equilibrium and navigates through space.

A meristem, in the context of plant biology, refers to a type of tissue found in plants that is responsible for their growth. These tissues are composed of cells that have the ability to divide and differentiate into various specialized cell types. Meristems are typically located at the tips of roots and shoots (apical meristems), as well as within the vascular bundles (cambial meristems) and in the cork layers (phellogen meristems). They contribute to the increase in length and girth of plant organs, allowing plants to grow throughout their life.

A medical definition for "plant shoots" may not be readily available, as the term is primarily used in botany and horticulture. However, I can provide you with a general definition:

Plant shoots refer to the above-ground portion of a plant, which typically includes structures like stems, leaves, flowers, and buds. Shoots originate from the seed or the growing tip of the plant and are responsible for photosynthesis, nutrient absorption, and reproduction. In some contexts, "plant shoots" might also refer to new growth that emerges from an existing plant, such as when a leaf or stem sprouts a new branch or flower.

'Zea mays' is the biological name for corn or maize, which is not typically considered a medical term. However, corn or maize can have medical relevance in certain contexts. For example, cornstarch is sometimes used as a diluent for medications and is also a component of some skin products. Corn oil may be found in topical ointments and creams. In addition, some people may have allergic reactions to corn or corn-derived products. But generally speaking, 'Zea mays' itself does not have a specific medical definition.

Mycorrhizae are symbiotic associations between fungi and the roots of most plant species. In a mycorrhizal association, fungi colonize the root tissues of plants and extend their mycelial networks into the surrounding soil. This association enhances the nutrient uptake capacity of the host plant, particularly with regards to phosphorus and nitrogen, while the fungi receive carbohydrates from the plant for their own growth and metabolism.

Mycorrhizal fungi can be broadly classified into two types: ectomycorrhizae and endomycorrhizae (or arbuscular mycorrhizae). Ectomycorrhizae form a sheath around the root surface, while endomycorrhizae penetrate the root cells and form structures called arbuscules, where nutrient exchange occurs. Mycorrhizal associations play crucial roles in maintaining ecosystem stability, promoting plant growth, and improving soil structure and fertility.

Plant growth regulators (PGRs) are natural or synthetic chemical substances that, when present in low concentrations, can influence various physiological and biochemical processes in plants. These processes include cell division, elongation, and differentiation; flowering and fruiting; leaf senescence; and stress responses. PGRs can be classified into several categories based on their mode of action and chemical structure, including auxins, gibberellins, cytokinins, abscisic acid, ethylene, and others. They are widely used in agriculture to improve crop yield and quality, regulate plant growth and development, and enhance stress tolerance.

DNA, or deoxyribonucleic acid, is the genetic material present in the cells of all living organisms, including plants. In plants, DNA is located in the nucleus of a cell, as well as in chloroplasts and mitochondria. Plant DNA contains the instructions for the development, growth, and function of the plant, and is passed down from one generation to the next through the process of reproduction.

The structure of DNA is a double helix, formed by two strands of nucleotides that are linked together by hydrogen bonds. Each nucleotide contains a sugar molecule (deoxyribose), a phosphate group, and a nitrogenous base. There are four types of nitrogenous bases in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T). Adenine pairs with thymine, and guanine pairs with cytosine, forming the rungs of the ladder that make up the double helix.

The genetic information in DNA is encoded in the sequence of these nitrogenous bases. Large sequences of bases form genes, which provide the instructions for the production of proteins. The process of gene expression involves transcribing the DNA sequence into a complementary RNA molecule, which is then translated into a protein.

Plant DNA is similar to animal DNA in many ways, but there are also some differences. For example, plant DNA contains a higher proportion of repetitive sequences and transposable elements, which are mobile genetic elements that can move around the genome and cause mutations. Additionally, plant cells have cell walls and chloroplasts, which are not present in animal cells, and these structures contain their own DNA.

Arabidopsis proteins refer to the proteins that are encoded by the genes in the Arabidopsis thaliana plant, which is a model organism commonly used in plant biology research. This small flowering plant has a compact genome and a short life cycle, making it an ideal subject for studying various biological processes in plants.

Arabidopsis proteins play crucial roles in many cellular functions, such as metabolism, signaling, regulation of gene expression, response to environmental stresses, and developmental processes. Research on Arabidopsis proteins has contributed significantly to our understanding of plant biology and has provided valuable insights into the molecular mechanisms underlying various agronomic traits.

Some examples of Arabidopsis proteins include transcription factors, kinases, phosphatases, receptors, enzymes, and structural proteins. These proteins can be studied using a variety of techniques, such as biochemical assays, protein-protein interaction studies, and genetic approaches, to understand their functions and regulatory mechanisms in plants.

A plant extract is a preparation containing chemical constituents that have been extracted from a plant using a solvent. The resulting extract may contain a single compound or a mixture of several compounds, depending on the extraction process and the specific plant material used. These extracts are often used in various industries including pharmaceuticals, nutraceuticals, cosmetics, and food and beverage, due to their potential therapeutic or beneficial properties. The composition of plant extracts can vary widely, and it is important to ensure their quality, safety, and efficacy before use in any application.

Aphanomyces is a genus of fungi-like oomycetes that are widely distributed in various environments, including soil and water. These organisms are known to cause diseases in plants, particularly in crops such as rice, corn, and legumes. The most well-known species is Aphanomyces euteiches, which causes a serious disease in peas and other legumes called "root rot." This disease can lead to significant yield losses in affected crops.

It's worth noting that while Aphanomyces species are often referred to as water molds, they are not true fungi but rather stramenopiles, which are more closely related to brown algae and diatoms. Nonetheless, they share many characteristics with fungi and are commonly studied in mycology, the branch of biology that deals with fungi.

The rhizosphere is not a medical term per se, but it is a term used in the field of biology and agriculture. It refers to the narrow region of soil that is directly influenced by root secretions and associated microorganisms, typically including a zone of about 1-2 mm around the root surface. The rhizosphere is characterized by increased microbial activity due to the release of organic compounds from the roots, which can affect nutrient availability, plant growth, and disease suppression.

RNA caps are structures found at the 5' end of RNA molecules, including messenger RNA (mRNA), ribosomal RNA (rRNA), and transfer RNA (tRNA). These caps consist of a modified guanine nucleotide (called 7-methylguanosine) that is linked to the first nucleotide of the RNA chain through a triphosphate bridge. The RNA cap plays several important roles in regulating RNA metabolism, including protecting the RNA from degradation by exonucleases, promoting the recognition and binding of the RNA by ribosomes during translation, and modulating the stability and transport of the RNA within the cell.

Root nodules in plants refer to the specialized structures formed through the symbiotic relationship between certain leguminous plants and nitrogen-fixing bacteria, most commonly belonging to the genus Rhizobia. These nodules typically develop on the roots of the host plant, providing an ideal environment for the bacteria to convert atmospheric nitrogen into ammonia, a form that can be directly utilized by the plant for growth and development.

The formation of root nodules begins with the infection of the plant's root hair cells by Rhizobia bacteria. This interaction triggers a series of molecular signals leading to the differentiation of root cortical cells into nodule primordia, which eventually develop into mature nodules. The nitrogen-fixing bacteria reside within these nodules in membrane-bound compartments called symbiosomes, where they reduce atmospheric nitrogen into ammonia through an enzyme called nitrogenase.

The plant, in turn, provides the bacteria with carbon sources and other essential nutrients required for their growth and survival within the nodules. The fixed nitrogen is then transported from the root nodules to other parts of the plant, enhancing its overall nitrogen nutrition and promoting sustainable growth without the need for external nitrogen fertilizers.

In summary, root nodules in plants are essential structures formed through symbiotic associations with nitrogen-fixing bacteria, allowing leguminous plants to convert atmospheric nitrogen into a usable form while also benefiting the environment by reducing the reliance on chemical nitrogen fertilizers.

In the context of medicine and biology, symbiosis is a type of close and long-term biological interaction between two different biological organisms. Generally, one organism, called the symbiont, lives inside or on another organism, called the host. This interaction can be mutually beneficial (mutualistic), harmful to the host organism (parasitic), or have no effect on either organism (commensal).

Examples of mutualistic symbiotic relationships in humans include the bacteria that live in our gut and help us digest food, as well as the algae that live inside corals and provide them with nutrients. Parasitic symbioses, on the other hand, involve organisms like viruses or parasitic worms that live inside a host and cause harm to it.

It's worth noting that while the term "symbiosis" is often used in popular culture to refer to any close relationship between two organisms, in scientific contexts it has a more specific meaning related to long-term biological interactions.

Pyrrolidinones are a class of organic compounds that contain a pyrrolidinone ring, which is a five-membered ring containing four carbon atoms and one nitrogen atom. The nitrogen atom is part of an amide functional group, which consists of a carbonyl (C=O) group bonded to a nitrogen atom.

Pyrrolidinones are commonly found in various natural and synthetic compounds, including pharmaceuticals, agrochemicals, and materials. They exhibit a wide range of biological activities, such as anti-inflammatory, antiviral, and anticancer properties. Some well-known drugs that contain pyrrolidinone rings include the pain reliever tramadol, the muscle relaxant cyclobenzaprine, and the antipsychotic aripiprazole.

Pyrrolidinones can be synthesized through various chemical reactions, such as the cyclization of γ-amino acids or the reaction of α-amino acids with isocyanates. The unique structure and reactivity of pyrrolidinones make them valuable intermediates in organic synthesis and drug discovery.

Cucurbitaceae is the scientific name for the gourd family of plants, which includes a variety of vegetables and fruits such as cucumbers, melons, squashes, and pumpkins. These plants are characterized by their trailing or climbing growth habits and their large, fleshy fruits that have hard seeds enclosed in a protective coat. The fruits of these plants are often used as food sources, while other parts of the plant may also have various uses such as medicinal or ornamental purposes.

"Acacia" is a scientific name for a genus of shrubs and trees that belong to the pea family, Fabaceae. It includes over 1,350 species found primarily in Australia and Africa, but also in Asia, America, and Europe. Some acacia species are known for their hardwood, others for their phyllodes (flattened leaf stalks) or compound leaves, and yet others for their flowers, which are typically small and yellow or cream-colored.

It is important to note that "Acacia" is not a medical term or concept, but rather a botanical one. While some acacia species have medicinal uses, the name itself does not have a specific medical definition.

Gene expression regulation in plants refers to the processes that control the production of proteins and RNA from the genes present in the plant's DNA. This regulation is crucial for normal growth, development, and response to environmental stimuli in plants. It can occur at various levels, including transcription (the first step in gene expression, where the DNA sequence is copied into RNA), RNA processing (such as alternative splicing, which generates different mRNA molecules from a single gene), translation (where the information in the mRNA is used to produce a protein), and post-translational modification (where proteins are chemically modified after they have been synthesized).

In plants, gene expression regulation can be influenced by various factors such as hormones, light, temperature, and stress. Plants use complex networks of transcription factors, chromatin remodeling complexes, and small RNAs to regulate gene expression in response to these signals. Understanding the mechanisms of gene expression regulation in plants is important for basic research, as well as for developing crops with improved traits such as increased yield, stress tolerance, and disease resistance.

'Plant development' is not a term typically used in medical definitions, as it is more commonly used in the field of botany to describe the growth and differentiation of plant cells, tissues, and organs over time. However, in a broader context, plant development can be defined as the series of changes and processes that occur from the fertilization of a plant seed to the formation of a mature plant, including germination, emergence, organ formation, growth, and reproduction.

In medicine, terms related to plant development may include "phytotherapy" or "herbal medicine," which refer to the use of plants or plant extracts as medicinal treatments for various health conditions. The study of how these plants develop and produce their active compounds is an important area of research in pharmacology and natural products chemistry.

I'm sorry for any confusion, but "hydroponics" is not a medical term. It is an agricultural technique and term. Hydroponics refers to the practice of growing plants in nutrient-rich water solutions, without soil. This method allows plants to obtain their necessary nutrients directly from the water, which is enriched with dissolved minerals. Common hydroponic systems include wick systems, deep water culture, nutrient film technique, ebb and flow system, aeroponics, and drip systems.

I'm sorry for any confusion, but "peas" is not a term typically used in medical definitions. Peas are a type of legume that is commonly consumed as a vegetable. They are rich in nutrients such as protein, fiber, vitamin C, and vitamin K. If you have any questions about the health benefits or potential risks of consuming peas, I would be happy to try to help with that.

I apologize for the confusion, but "Plant Epidermis" is not a medical term. Instead, it is a term used in botany to describe the outermost layer of cells in plant tissues. The epidermis serves as a protective barrier for the plant, regulating gas exchange and water loss through stomata, and producing cutin, a waxy substance that helps prevent water loss.

In summary, "Plant Epidermis" is a term related to plant biology and not medicine.

I'm sorry for any confusion, but "gravitation" is not a term that is typically used in the context of medical definitions. Gravitation is a fundamental force that attracts two objects with mass towards each other. It is the force that causes objects to fall towards the earth and keeps the planets in orbit around the sun.

In the field of medicine, the concepts of gravity or gravitational forces are not directly relevant to the diagnosis or treatment of medical conditions. However, there may be some indirect applications related to physiology and human health, such as the effects of microgravity on the human body during space travel.

Angiosperms, also known as flowering plants, are a group of plants that produce seeds enclosed within an ovary. The term "angiosperm" comes from the Greek words "angeion," meaning "case" or "capsule," and "sperma," meaning "seed." This group includes the majority of plant species, with over 300,000 known species.

Angiosperms are characterized by their reproductive structures, which consist of flowers. The flower contains male and female reproductive organs, including stamens (which produce pollen) and carpels (which contain the ovules). After fertilization, the ovule develops into a seed, while the ovary matures into a fruit, which provides protection and nutrition for the developing embryo.

Angiosperms are further divided into two main groups: monocots and eudicots. Monocots have one cotyledon or embryonic leaf, while eudicots have two. Examples of monocots include grasses, lilies, and orchids, while examples of eudicots include roses, sunflowers, and legumes.

Angiosperms are ecologically and economically important, providing food, shelter, and other resources for many organisms, including humans. They have evolved a wide range of adaptations to different environments, from the desert to the ocean floor, making them one of the most diverse and successful groups of plants on Earth.

"Solanaceae" is not a medical term but a taxonomic category in biology, referring to the Nightshade family of plants. This family includes several plants that have economic and medicinal importance, as well as some that are toxic or poisonous. Some common examples of plants in this family include:

- Solanum lycopersicum (tomato)
- Solanum tuberosum (potato)
- Capsicum annuum (bell pepper and chili pepper)
- Nicotiana tabacum (tobacco)
- Atropa belladonna (deadly nightshade)
- Hyoscyamus niger (henbane)

While Solanaceae isn't a medical term itself, certain plants within this family have medical significance. For instance, some alkaloids found in these plants can be used as medications or pharmaceutical precursors, such as atropine and scopolamine from Atropa belladonna, hyoscine from Hyoscyamus niger, and capsaicin from Capsicum species. However, it's important to note that many of these plants also contain toxic compounds, so they must be handled with care and used only under professional supervision.

I'm sorry for any confusion, but "soil" is not a term that has a medical definition. Soil is defined as the top layer of earth in which plants grow, a mixture of organic material, clay, sand, and silt. If you have any questions related to medicine or health, I would be happy to try to help answer them for you.

'Toxic plants' refer to those species of plants that contain toxic substances capable of causing harmful effects or adverse health reactions in humans and animals when ingested, touched, or inhaled. These toxins can cause a range of symptoms from mild irritation to serious conditions such as organ failure, paralysis, or even death depending on the plant, the amount consumed, and the individual's sensitivity to the toxin.

Toxic plants may contain various types of toxins, including alkaloids, glycosides, proteins, resinous substances, and essential oils. Some common examples of toxic plants include poison ivy, poison oak, nightshade, hemlock, oleander, castor bean, and foxglove. It is important to note that some parts of a plant may be toxic while others are not, and the toxicity can also vary depending on the stage of growth or environmental conditions.

If you suspect exposure to a toxic plant, it is essential to seek medical attention immediately and, if possible, bring a sample of the plant for identification.

A tooth root is the part of a tooth that is embedded in the jawbone and cannot be seen when looking at a person's smile. It is the lower portion of a tooth that typically has a conical shape and anchors the tooth to the jawbone through a periodontal ligament. The tooth root is covered by cementum, a specialized bone-like tissue, and contains nerve endings and blood vessels within its pulp chamber.

The number of roots in a tooth can vary depending on the type of tooth. For example, incisors typically have one root, canines may have one or two roots, premolars usually have one or two roots, and molars often have two to four roots. The primary function of the tooth root is to provide stability and support for the crown of the tooth, allowing it to withstand the forces of biting and chewing.

A plant stem is not typically defined in a medical context, but rather in the field of botany. However, I can certainly provide a general biological definition for you.

In plants, stems are organs that serve primarily as support structures, holding leaves, flowers, and fruits aloft where they can receive sunlight and exchange gases. They also act as conduits, transporting water, nutrients, and sugars made during photosynthesis between the roots and shoots of a plant.

The stem is usually composed of three main tissue systems: dermal, vascular, and ground. The dermal tissue system forms the outermost layer(s) of the stem, providing protection and sometimes participating in gas exchange. The vascular tissue system contains the xylem (which transports water and nutrients upward) and phloem (which transports sugars and other organic compounds downward). The ground tissue system, located between the dermal and vascular tissues, is responsible for food storage and support.

While not a direct medical definition, understanding the structure and function of plant stems can be relevant in fields such as nutrition, agriculture, and environmental science, which have implications for human health.

Tropism, in the context of medicine and biology, refers to the growth or turning movement of an organism or its parts (like cells, roots, etc.) in response to an external stimulus such as light, gravity, touch, or chemical substances. This phenomenon is most commonly observed in plants, but it can also occur in certain types of animal cells. In a medical context, the term "tropism" is sometimes used to describe the preference of a virus or other infectious agent to attach to and invade specific types of cells in the body.

A plant cell is defined as a type of eukaryotic cell that makes up the structural basis of plants and other forms of multicellular plant-like organisms, such as algae and mosses. These cells are typically characterized by their rigid cell walls, which provide support and protection, and their large vacuoles, which store nutrients and help maintain turgor pressure within the cell.

Plant cells also contain chloroplasts, organelles that carry out photosynthesis and give plants their green color. Other distinctive features of plant cells include a large central vacuole, a complex system of membranes called the endoplasmic reticulum, and numerous mitochondria, which provide energy to the cell through cellular respiration.

Plant cells are genetically distinct from animal cells, and they have unique structures and functions that allow them to carry out photosynthesis, grow and divide, and respond to their environment. Understanding the structure and function of plant cells is essential for understanding how plants grow, develop, and interact with their surroundings.

The root cap is a type of tissue at the tip of a plant root. It is also called calyptra. Root caps contain statocytes which are ... If the cap is carefully removed the root will grow randomly. The root cap protects the growing tip in plants. It secretes ... The purpose of the root cap is to enable downward growth of the root, with the root cap covering the sensitive tissue in the ... The root cap is absent in some parasitic plants: 138 and some aquatic plants, in which a sac-like structure called the root ...
Here we show that hydrotropism still occurs in roots after laser ablation removed the meristem and root cap. Additionally, ... The root cortex in the elongation zone is the site of perception during hydrotropism but also the site of differential root ... We conclude that root tropic responses to gravity and water are driven by distinct tissue-based mechanisms. In addition, unlike ... its role in root gravitropism, the elongation zone performs a dual function during a hydrotropic response, both sensing a water ...
It probably came in with our root dips. We root dip our plants with … beneficial organisms. We grab some of this mycelium [and ... A friend came by and asked why we werent eating our wine caps. This mycelium is everywhere now on our site. ... He plants aronia in the compacted soil of berms of ponds, as it doesnt root deeply, and all over "really rough soil." ... "We originally planted about 200 trees bare-root into our site and mulched them with wood chips. A year later, during the summer ...
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The Root Microbiome explores how root microbiomes influence plants across multiple scales-from cellular, bacterial, and whole ... These microbes can influence a plants genetic structure, its health, and its interactions with other plants. A new series of ... and yet organisms below the soils surface play a vital role in plant functions and ecosystem well-being. ... This is a mass of border cell-root cap mucilage covering a cotton root tip, 30 seconds after immersion into water. Credit: ...
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The dual effects of root-cap exudates on nematodes: from quiescence in plant-parasitic nematodes to frenzy in entomopathogenic ... Airborne host-plant manipulation by whiteflies via an inducible blend of plant volatiles. Proc. Natl. Acad. Science USA 116: ... Root signals that mediate mutualistic interactions in the rhizosphere. Current Opinion in Plant Biology 32: 62-68. ... Plant, Cell & Environment 40: 330-339.. Röder G, Mota M, Turlings TCJ 2017. Host plant location by chemotaxis in an aquatic ...
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You can use the Plant Finder to narrow down the list of species for your needs. Once you have your species list, quantities, ... You can find a complete list of species we carry under Our Plants. ... The planting of the root-bag material requires that all covering material be removed from the ball before planting. This ... includes the removal of all rope, burlap, nylon bag and "cap" (white nylon on the bottom of the ball). ...
They can modulate various biochemical and physiological processes, including plant response and resistance to fungal pathogens ... Plant Cell. 2003;15(2):533-543.. *Wang JW, Wang LJ, Mao YB, Cai WJ, Xue HW, Chen XY. Control of root cap formation by microRNA- ... Plant Cell. 2010;22(4):1104-1117.. *Dodds PN, Rathjen JP. Plant immunity: towards an integrated view of plant-pathogen ... Bari R, Jones J. Role of plant hormones in plant defence responses. Plant Mol Biol. 2009;69(4):473-488. ...
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The god said, If you wish to plant a superior root (growth) of merit, then seek a superior field (in which to acquire if). The ... cap. 39) that this city επιφανεστατη κει μεγιστη was founded by Herakles. The Buddhist accounts speak of it as a village, Pāṭa ... It was a sort of first-fruit (preparation in planting the root of virtue), and a pattern of majestic construction (lofty ... Compare Fa-hian, cap. xxix. The Vulture Peak is a part of the lofty hill now called Śaila-giri, but no caves have been ...
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Devils Claw Root - Perennial South African plant used in African herbalism for its anti-inflammatory effects on joints. ... Turmeric Root - Native to southwest India, this yellowish culinary herb has been used in Ayurveda for joint support. ... As a dietary supplement, adults take three (3) vegetarian caps up to two (2) times daily prior to mealtime, or as directed by a ... Smart Herbs products are safe, vitamin and herb-based formulas extracted from natural plant and mineral sources. Our products ...
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Biscuitroot (Lomatium) is a small, parsley-looking plant that has a large, edible root. When youre digging up these corms ( ... The hollow stem, with the cap fully attached, and pitted surface make this mushroom reasonably easy to identify. It takes an ... Though learning birds, plants, and reading sign is most easily learned from a mentor, its always based on experience… the best ... The reason might date to our early-human ancestors, to whom the scent might have indicated the likelihood of edible plants. ...
Closer investigation of microtomed sections of the wheat plants revealed that label in the root cap zone the label did not ... Humic substances improve soil structure and fertility and positively influence nutrient uptake by plants and improve root ... Labelled humic acid preferentially accumulates in the root endodermis. The largest constituent of organic soil matter is humic ... penetrate into the plant interior, whereas in the root hair zone label was copiously present in both epidermal and endodermal ...
The root is the axial organ of the plant, which has radial symmetry, has unlimited long growth, has root hairs and a cap and ... Anatomical structure of the root of Lavandula officinalis in the cross section: (a) general view of the root; (b) cortex ... Wood occupies a continuous central root cylinder. Primary conductive tissues are preserved in the root, and then secondary ones ... Axial Organs Plant. The base of the stem on the cross section is rounded, beam type. The structures of the stems of woody ...
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Plants, an international, peer-reviewed Open Access journal. ... The root cap is a small tissue located at the tip of the root ... Plant Cells under Attack: Unconventional Endomembrane Trafficking during Plant Defense by Guillermo Ruano ... Smooth trafficking within the plant endomembrane [...] Read more. Since plants lack specialized immune cells, each cell has to ... We studied the capacity of strains of Pseudomonas, selected as oil degraders, to produce plant hormones and promote plant ...
I want to set up some bettas in new tank with some live plants. The only think is that I dont want to dirt these tanks but was ... I planted the bowls/dishes out of the water. I used tank water to moisten the soil, plant, add a top layer cap to hold these ... Root tabs are helping the plants. The banana plant hasnt been uprooted in several weeks. Youll notice a couple photo bombers ... The plants are doing amazing after 2 years like that. All I have to do is add a root tab every 8 months or so. The amazon ...
Plants respond to slow, deep watering by growing bigger, healthier root systems, which mean bigger, healthier plants. ... or an inverted repurposed soda bottle with a hole poked in its cap, and sink it a few inches underground. Fill it with water ... This rots the bark and degrades root health. If a tree bed doesnt have enough soil to hold additional plants, help the tree by ... Dog urine doesnt "water" plants. It does just the opposite-it starves plant roots of water. A spokesperson from the New York ...
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Spray the plants to moisten them. Add a few pieces of bark or twigs to the surface, and then seal the bottle with a cap or lid ... next add the soil to the bottle to a depth that will comfortably hold the root system of the plants as they grow. Spray the ... Monitor the plants over the next few days to ensure they are healthy. You may need to replace one or two plants or add a little ... Add the plants to the bottle using a long stick to assist with the effort if the neck of the jar or bottle is narrow. ...

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