Hypocotyl
Arabidopsis
Arabidopsis Proteins
Phototropism
Indoleacetic Acids
Gravitropism
Cotyledon
Phytochrome A
Phytochrome B
Gene Expression Regulation, Plant
Plant Roots
Plant Growth Regulators
Plants, Genetically Modified
Ethylenes
Cucumis sativus
Gibberellins
Cryptochromes
Etiolation
Helianthus
Brassinosteroids
Plant Proteins
Gravity Sensing
Plant Epidermis
Mutation
Seeds
2,4-Dichlorophenoxyacetic Acid
Cytokinins
Plant Stems
Germination
Flavoproteins
Fabaceae
Phenotype
Photoperiod
Anthocyanins
Cell Wall
Pectins
Plants, Medicinal
Soybeans
Basic-Leucine Zipper Transcription Factors
Lycopersicon esculentum
Plant Leaves
Circadian Clocks
Xylem
RNA, Plant
Lepidium
Gravitation
Molecular Sequence Data
Photoreceptors, Plant
Steroids, Heterocyclic
Light-dependent translocation of a phytochrome B-GFP fusion protein to the nucleus in transgenic Arabidopsis. (1/551)
Phytochrome is a ubiquitous photoreceptor of plants and is encoded by a small multigene family. We have shown recently that a functional nuclear localization signal may reside within the COOH-terminal region of a major member of the family, phytochrome B (phyB) (Sakamoto, K., and A. Nagatani. 1996. Plant J. 10:859-868). In the present study, a fusion protein consisting of full-length phyB and the green fluorescent protein (GFP) was overexpressed in the phyB mutant of Arabidopsis to examine subcellular localization of phyB in intact tissues. The resulting transgenic lines exhibited pleiotropic phenotypes reported previously for phyB overexpressing plants, suggesting that the fusion protein is biologically active. Immunoblot analysis with anti-phyB and anti-GFP monoclonal antibodies confirmed that the fusion protein accumulated to high levels in these lines. Fluorescence microscopy of the seedlings revealed that the phyB-GFP fusion protein was localized to the nucleus in light grown tissues. Interestingly, the fusion protein formed speckles in the nucleus. Analysis of confocal optical sections confirmed that the speckles were distributed within the nucleus. In contrast, phyB-GFP fluorescence was observed throughout the cell in dark-grown seedlings. Therefore, phyB translocates to specific sites within the nucleus upon photoreceptor activation. (+info)poc1: an Arabidopsis mutant perturbed in phytochrome signaling because of a T DNA insertion in the promoter of PIF3, a gene encoding a phytochrome-interacting bHLH protein. (2/551)
The phytochrome family of informational photoreceptors has a central role in regulating light-responsive gene expression, but the mechanism of intracellular signal transduction has remained elusive. In a genetic screen for T DNA-tagged Arabidopsis mutants affected in early signaling intermediates, we identified poc1 (photocurrent 1), which exhibits enhanced responsiveness to red light. This phenotype is absent in a phyB (phytochrome B) null mutant background, indicating that the poc1 mutation enhances phyB signal transduction. The T DNA insertion in poc1 was found to be located in the promoter region of PIF3, a gene encoding a basic helix-loop-helix protein. The mutant phenotype seems to result from insertion-induced overexpression of this gene in red-light-grown seedlings, consistent with PIF3 functioning as a positively acting signaling intermediate. These findings, combined with data from a separate yeast two-hybrid screen that identified PIF3 as a phytochrome-interacting factor necessary for normal signaling, provide evidence that phytochrome signal transduction may include a direct pathway to photoresponsive nuclear genes via physical interaction of the photoreceptor molecules with the potential transcriptional regulator PIF3. (+info)Expansins are conserved in conifers and expressed in hypocotyls in response to exogenous auxin. (3/551)
Differential display reverse transcription-polymerase chain reaction was used to detect the induction of gene expression during adventitious root formation in loblolly pine (Pinus taeda) after treatment with the exogenous auxin indole-3-butyric acid. A BLAST search of the GenBank database using one of the clones obtained revealed very strong similarity to the alpha-expansin gene family in angiosperms. A near-full-length loblolly pine alpha-expansin sequence was obtained using 5'- and 3'-rapid amplification of cDNA end cloning, and the deduced amino acid sequence was highly conserved relative to those of angiosperm expansins. Northern analysis indicates that alpha-expansin mRNA expression increases 50- to 100-fold in the base of hypocotyl stem cuttings from loblolly pine seedlings in response to indole-3-butyric acid, with peak expression occurring 24 to 48 h after induction. (+info)Ethylene plays multiple nonprimary roles in modulating the gravitropic response in tomato. (4/551)
Ethylene is known to interact with auxin in regulating stem growth, and yet evidence for the role of ethylene in tropic responses is contradictory. Our analysis of four mutants of tomato (Lycopersicon esculentum) altered in their response to gravity, auxin, and/or ethylene revealed concentration-dependent modulation of shoot gravitropism by ethylene. Ethylene inhibitors reduce wild-type gravicurvature, and extremely low (0.0005-0.001 microliter L-1) ethylene concentrations can restore the reduced gravitropic response of the auxin-resistant dgt (diageotropica) mutant to wild-type levels. Slightly higher concentrations of ethylene inhibit the gravitropic response of all but the ethylene-insensitive nr (never-ripe) mutant. The gravitropic responses of nr and the constitutive-response mutant epi (epinastic) are slightly and significantly delayed, respectively, but otherwise normal. The reversal of shoot gravicurvature by red light in the lz-2 (lazy-2) mutant is not affected by ethylene. Taken together, these data indicate that, although ethylene does not play a primary role in the gravitropic response of tomato, low levels of ethylene are necessary for a full gravitropic response, and moderate levels of the hormone specifically inhibit gravicurvature in a manner different from ethylene inhibition of overall growth. (+info)Regulation of differential growth in the apical hook of Arabidopsis. (5/551)
Arabidopsis seedlings develop a hook-like structure at the apical part of the hypocotyl when grown in darkness. Differential cell growth processes result in the curved hypocotyl hook. Time-dependent analyses of the hypocotyl showed that the apical hook is formed during an early phase of seedling growth and is maintained in a sequential phase by a distinct process. Based on developmental genetic analyses of hook-affected mutants, we show that the hookless mutants (hls1, cop2) are involved in an early aspect of hook development. From time-dependent analyses of ethylene-insensitive mutants, later steps in hook maintenance were found to be ethylene sensitive. Regulation of differential growth was further studied through examination of the spatial pattern of expression of two hormone-regulated genes: an ethylene biosynthetic enzyme and the ethylene receptor ETR1. Accumulation of mRNA for AtACO2, a novel ACC (1-aminocyclopropane-1-carboxylic acid) oxidase gene, occurred within cells predominantly located on the outer-side of the hook and was tightly correlated with ethylene-induced exaggeration in the curvature of the hook. ETR1 expression in the apical hook, however, was reduced by ethylene treatment. Based on the expression pattern of ETR1 and AtACO2 in the hook-affected mutants, a model for hook development and maintenance is proposed. (+info)Sulfate is both a substrate and an activator of the voltage-dependent anion channel of Arabidopsis hypocotyl cells. (6/551)
On the basis of the anion content of in vitro-cultured Arabidopsis plantlets, we explored the selectivity of the voltage-dependent anion channel of the plasma membrane of hypocotyl cells. In the whole-cell configuration, substitution of cytosolic Cl(-) by different anions led to the following sequence of relative permeabilities: NO(3)(-) (2.6) >/= SO(4)(2-) (2.0) > Cl(-) (1.0) > HCO(3)(-) (0.8) >> malate(2-) (0.03). Large whole-cell currents were measured for NO(3)(-) and SO(4)(2-), about five to six times higher than the equivalent Cl(-) currents. Since SO(4)(2-) is usually considered to be a weakly permeant or non-permeant ion, the components of the large whole-cell current were explored in more detail. Aside from its permeation through the channel with a unitary conductance, about two-thirds that of Cl(-), SO(4)(2-) had a regulatory effect on channel activity by preventing the run-down of the anion current both in the whole-cell and the outside-out configuration, increasing markedly the whole-cell current. The fact that the voltage-dependent plasma membrane anion channel of hypocotyl cells can mediate large NO(3)(-) and SO(4)(2-) currents and is regulated by nucleotides favors the idea that this anion channel can contribute to the cellular homeostasis of important metabolized anions. (+info)The relationship between ethylene binding and dominant insensitivity conferred by mutant forms of the ETR1 ethylene receptor. (7/551)
Ethylene responses in Arabidopsis are mediated by a small family of receptors, including the ETR1 gene product. Specific mutations in the N-terminal ethylene-binding domain of any family member lead to dominant ethylene insensitivity. To investigate the mechanism of ethylene insensitivity, we examined the effects of mutations on the ethylene-binding activity of the ETR1 protein expressed in yeast. The etr1-1 and etr1-4 mutations completely eliminated ethylene binding, while the etr1-3 mutation severely reduced binding. Additional site-directed mutations that disrupted ethylene binding in yeast also conferred dominant ethylene insensitivity when the mutated genes were transferred into wild-type Arabidopsis plants. By contrast, the etr1-2 mutation did not disrupt ethylene binding in yeast. These results indicate that dominant ethylene insensitivity may be conferred by mutations that disrupt ethylene binding or that uncouple ethylene binding from signal output by the receptor. Increased dosage of wild-type alleles in triploid lines led to the partial recovery of ethylene sensitivity, indicating that dominant ethylene insensitivity may involve either interactions between wild-type and mutant receptors or competition between mutant and wild-type receptors for downstream effectors. (+info)Modification of distinct aspects of photomorphogenesis via targeted expression of mammalian biliverdin reductase in transgenic Arabidopsis plants. (8/551)
The phenotypic consequences of targeted expression of mammalian biliverdin IXalpha reductase (BVR), an enzyme that metabolically inactivates the linear tetrapyrrole precursors of the phytochrome chromophore, are addressed in this investigation. Through comparative phenotypic analyses of multiple plastid-targeted and cytosolic BVR transgenic Arabidopsis plant lines, we show that the subcellular localization of BVR affects distinct subsets of light-mediated and light-independent processes in plant growth and development. Regardless of its cellular localization, BVR suppresses the phytochrome-modulated responses of hypocotyl growth inhibition, sucrose-stimulated anthocyanin accumulation, and inhibition of floral initiation. By contrast, reduced protochlorophyll levels in dark-grown seedlings and fluence-rate-dependent reduction of chlorophyll occur only in transgenic plants in which BVR is targeted to plastids. Together with companion analyses of the phytochrome chromophore-deficient hy1 mutant, our results suggest a regulatory role for linear tetrapyrroles within the plastid compartment distinct from their assembly with apophytochromes in the cytosol. (+info)Arabidopsis Proteins refer to proteins that are encoded by genes in the genome of the plant species Arabidopsis thaliana. Arabidopsis is a small flowering plant that is widely used as a model organism in plant biology research due to its small size, short life cycle, and ease of genetic manipulation. Arabidopsis proteins have been extensively studied in the medical field due to their potential applications in drug discovery, disease diagnosis, and treatment. For example, some Arabidopsis proteins have been found to have anti-inflammatory, anti-cancer, and anti-viral properties, making them potential candidates for the development of new drugs. In addition, Arabidopsis proteins have been used as tools for studying human diseases. For instance, researchers have used Arabidopsis to study the molecular mechanisms underlying human diseases such as Alzheimer's, Parkinson's, and Huntington's disease. Overall, Arabidopsis proteins have become an important resource for medical research due to their potential applications in drug discovery and disease research.
Indoleacetic Acids (IAAs) are a type of plant hormone that play a crucial role in plant growth and development. They are synthesized from the amino acid tryptophan and are involved in various aspects of plant physiology, including cell division, elongation, and differentiation. In the medical field, IAAs have been studied for their potential therapeutic applications. For example, IAAs have been shown to have anti-inflammatory and anti-cancer properties, and they may be useful in the treatment of various diseases, including cancer, inflammatory bowel disease, and rheumatoid arthritis. IAAs have also been used in agriculture as a growth promoter for plants. They can stimulate root growth, increase plant biomass, and improve crop yields. However, the use of IAAs as a plant growth promoter is controversial, as it may have negative environmental impacts and may contribute to the development of antibiotic-resistant bacteria. Overall, IAAs are an important class of plant hormones with potential therapeutic and agricultural applications.
Phytochrome is a photoreceptor protein found in plants and some bacteria that plays a crucial role in regulating various aspects of plant growth and development, including seed germination, photomorphogenesis, and photoperiodic responses. In the medical field, phytochrome has been studied for its potential therapeutic applications. For example, some studies have suggested that phytochrome may have anti-inflammatory and anti-cancer properties, and may be useful in the treatment of various diseases. Additionally, phytochrome has been shown to modulate the immune system and may have potential as a treatment for autoimmune disorders. However, more research is needed to fully understand the potential therapeutic applications of phytochrome.
Phytochrome A is a photoreceptor protein found in plants that plays a crucial role in regulating various aspects of plant growth and development, including seed germination, photomorphogenesis, and flowering time. It is a light-sensitive protein that undergoes reversible photoconversion between two distinct forms, Pr (red-absorbing form) and Pfr (far-red-absorbing form), in response to changes in light intensity and quality. In the medical field, phytochrome A has been studied for its potential therapeutic applications in various diseases, including cancer, cardiovascular disease, and neurodegenerative disorders. For example, research has shown that phytochrome A can modulate the activity of various signaling pathways involved in cell proliferation, differentiation, and apoptosis, which may have implications for cancer treatment. Additionally, phytochrome A has been shown to have anti-inflammatory and antioxidant effects, which may be beneficial in the management of chronic diseases such as cardiovascular disease and neurodegenerative disorders.
Phytochrome B is a photoreceptor protein found in plants that plays a crucial role in regulating various aspects of plant growth and development, including seed germination, photomorphogenesis, and flowering time. It is a member of the phytochrome family of photoreceptors, which are responsible for sensing and responding to changes in light quality and quantity. Phytochrome B is activated by red light and deactivated by far-red light. When activated, it undergoes a conformational change that allows it to interact with other proteins in the plant cell, triggering a cascade of signaling events that ultimately lead to changes in gene expression and cellular behavior. In the medical field, phytochrome B has been studied for its potential therapeutic applications. For example, researchers have investigated the use of phytochrome B as a target for cancer therapy, as it is overexpressed in certain types of cancer cells. Additionally, phytochrome B has been shown to play a role in regulating the immune system, and may have potential applications in the treatment of autoimmune diseases.
In the medical field, ethylenes are a group of organic compounds that contain a carbon-carbon double bond. They are commonly used as anesthetic gases and as propellants in inhalation anesthetics. Ethylenes are also used in the production of plastics, solvents, and other chemicals. Some examples of ethylenes include ethylene oxide, ethylene glycol, and ethylene dichloride. These compounds can have both therapeutic and toxic effects on the body, depending on the dose and duration of exposure.
Gibberellins are a group of plant hormones that play important roles in plant growth and development. They are synthesized in the shoot apical meristem and other parts of the plant, and are transported to other parts of the plant where they regulate various aspects of growth and development. In the medical field, gibberellins have been studied for their potential therapeutic applications. For example, some studies have suggested that gibberellins may have anti-cancer properties, as they have been shown to inhibit the growth of certain types of cancer cells in vitro. Additionally, gibberellins have been studied for their potential to promote wound healing, as they have been shown to stimulate the production of growth factors and other molecules that are important for tissue repair. However, it is important to note that the use of gibberellins in medicine is still in the experimental stage, and more research is needed to fully understand their potential therapeutic effects and to determine the safety and efficacy of their use in humans.
Cryptochromes are a class of photoreceptor proteins that are found in a variety of organisms, including plants, insects, and mammals. They are responsible for detecting and responding to blue light, which is a type of electromagnetic radiation with a wavelength of around 400-500 nanometers. In the medical field, cryptochromes have been studied for their potential role in regulating circadian rhythms, which are the internal biological clocks that control various physiological processes in the body, such as sleep-wake cycles, hormone production, and metabolism. Cryptochromes have been shown to play a key role in the synchronization of circadian rhythms to the external environment, and they are thought to be involved in the regulation of mood, memory, and other cognitive functions. In addition to their role in circadian rhythms, cryptochromes have also been implicated in a number of other biological processes, including the regulation of cell growth and differentiation, the protection against oxidative stress, and the prevention of cancer. Further research is needed to fully understand the role of cryptochromes in health and disease.
Brassinosteroids are a class of plant hormones that play important roles in regulating various physiological processes in plants, including growth and development, stress responses, and defense against pathogens. They are structurally similar to the human hormone cortisol and are synthesized in the plant's leaves and roots. In the medical field, brassinosteroids have been studied for their potential therapeutic applications in treating various diseases and conditions, including cancer, osteoporosis, and inflammatory disorders. Some studies have shown that brassinosteroids can inhibit the growth of cancer cells and promote the differentiation of bone cells, while others have suggested that they may have anti-inflammatory effects. However, more research is needed to fully understand the potential therapeutic benefits of brassinosteroids and to determine the optimal dosages and treatment regimens for various conditions. Additionally, the use of brassinosteroids in humans may be limited by potential side effects and interactions with other medications.
Plant proteins are proteins that are derived from plants. They are an important source of dietary protein for many people and are a key component of a healthy diet. Plant proteins are found in a wide variety of plant-based foods, including legumes, nuts, seeds, grains, and vegetables. They are an important source of essential amino acids, which are the building blocks of proteins and are necessary for the growth and repair of tissues in the body. Plant proteins are also a good source of fiber, vitamins, and minerals, and are generally lower in saturated fat and cholesterol than animal-based proteins. In the medical field, plant proteins are often recommended as part of a healthy diet for people with certain medical conditions, such as heart disease, diabetes, and high blood pressure.
In the medical field, "Amino Acids, Cyclic" refers to a group of amino acids that have a ring structure in their side chain. These amino acids are also known as "cyclic amino acids" or "cyclic peptides." They are formed by the condensation of two or more amino acids through peptide bonds, resulting in a ring structure. Cyclic amino acids are found in various biological molecules, including peptides, proteins, and nucleic acids. They play important roles in various biological processes, such as enzyme catalysis, signal transduction, and gene regulation. Some examples of cyclic amino acids include proline, hydroxyproline, and ornithine. These amino acids have unique chemical and physical properties that make them useful in various medical applications, such as drug development, tissue engineering, and gene therapy.
2,4-Dichlorophenoxyacetic acid (2,4-D) is a synthetic herbicide that is commonly used in agriculture to control broadleaf weeds. It is also used in some medical applications, particularly in the treatment of prostate cancer. In the medical field, 2,4-D is used in combination with other drugs to treat prostate cancer. It works by blocking the production of a hormone called dihydrotestosterone (DHT), which is responsible for the growth of prostate cancer cells. The drug is typically administered as an intravenous injection or as a suppository. It is important to note that 2,4-D is not approved for use in the treatment of prostate cancer by the U.S. Food and Drug Administration (FDA). However, it is sometimes used off-label in clinical trials or by individual doctors. As with any medical treatment, the use of 2,4-D for prostate cancer should be discussed with a qualified healthcare provider.
Cytokinins are a class of plant hormones that play a crucial role in regulating various aspects of plant growth and development. They are primarily responsible for promoting cell division and differentiation, shoot and root growth, leaf expansion, and the delay of senescence (aging) in plants. Cytokinins are synthesized in various parts of the plant, including roots, leaves, and seeds, and are transported throughout the plant via the xylem and phloem tissues. They act by binding to specific receptors on the surface of plant cells, triggering a cascade of intracellular signaling events that ultimately lead to changes in gene expression and cellular behavior. In addition to their role in plant growth and development, cytokinins have also been shown to have potential therapeutic applications in medicine. For example, they have been studied for their potential to promote wound healing, reduce inflammation, and improve bone density in humans.
Flavoproteins are a class of proteins that contain a covalently bound flavin molecule, which is a prosthetic group consisting of a pyrazine ring and a ribityl side chain. Flavoproteins are involved in a wide range of biological processes, including metabolism, redox reactions, and signal transduction. Flavoproteins can be classified into two main types based on the type of flavin they contain: FMN (flavin mononucleotide) and FAD (flavin adenine dinucleotide). FMN is a reduced form of flavin, while FAD is an oxidized form. Flavoproteins play important roles in various medical conditions, including cancer, neurodegenerative diseases, and cardiovascular diseases. For example, flavoproteins such as NADH dehydrogenase and flavin reductase are involved in the electron transport chain, which is essential for energy production in cells. Mutations in genes encoding flavoproteins can lead to defects in this process, resulting in various diseases. In addition, flavoproteins are also involved in the metabolism of drugs and toxins, and are targets for the development of new drugs. For example, flavoproteins such as cytochrome P450 enzymes are involved in the metabolism of many drugs, and inhibitors of these enzymes can be used to enhance the efficacy of certain drugs or reduce their toxicity.
Anthocyanins are a group of naturally occurring pigments found in plants, particularly in fruits, vegetables, and flowers. They are responsible for the red, purple, and blue colors of many fruits and vegetables, such as blueberries, blackberries, raspberries, red cabbage, and red grapes. In the medical field, anthocyanins have been studied for their potential health benefits. Some studies have suggested that anthocyanins may have antioxidant properties, which could help protect against damage to cells caused by free radicals. They may also have anti-inflammatory effects, which could help reduce inflammation in the body. Anthocyanins have been studied for their potential role in preventing or treating a variety of health conditions, including cancer, cardiovascular disease, and diabetes. However, more research is needed to fully understand the potential health benefits of anthocyanins and to determine the optimal dosage and duration of treatment.
Kinetin is a plant hormone that belongs to the cytokinin group. It is a naturally occurring compound that is produced in plants and has a variety of physiological effects on plant growth and development. In the medical field, kinetin has been studied for its potential therapeutic applications. It has been shown to have anti-inflammatory and anti-cancer properties, and may be useful in the treatment of a variety of diseases, including cancer, inflammatory bowel disease, and rheumatoid arthritis. Kinetin has also been used in research to study the mechanisms of plant growth and development, and to develop new methods for improving crop yields and increasing plant resistance to environmental stress.
Pectins are a group of complex polysaccharides that are commonly found in the cell walls of plants, particularly in fruits and vegetables. They are composed of long chains of sugar molecules and are responsible for giving fruits their firmness and texture. In the medical field, pectins have been studied for their potential health benefits. They have been shown to have prebiotic effects, meaning they can promote the growth of beneficial bacteria in the gut. This can help improve digestion and boost the immune system. Pectins have also been found to have anti-inflammatory properties, which may help reduce the risk of chronic diseases such as heart disease, diabetes, and cancer. They have also been studied for their potential to lower cholesterol levels and improve blood sugar control. In addition to their potential health benefits, pectins are also used in a variety of food products, including jams, jellies, and fruit juices, as they help to thicken and stabilize these products.
Basic-Leucine Zipper Transcription Factors (bZIP) are a family of transcription factors that play a crucial role in regulating gene expression in various biological processes, including development, differentiation, and stress response. These transcription factors are characterized by the presence of a basic region and a leucine zipper domain, which allow them to interact with DNA and other proteins. The basic region of bZIP proteins contains a cluster of basic amino acids that can bind to DNA, while the leucine zipper domain is a stretch of amino acids that form a coiled-coil structure, allowing bZIP proteins to dimerize and bind to DNA as a pair. bZIP transcription factors regulate gene expression by binding to specific DNA sequences called cis-regulatory elements, which are located in the promoter or enhancer regions of target genes. Once bound to DNA, bZIP proteins can recruit other proteins, such as coactivators or corepressors, to modulate the activity of the transcription machinery and control gene expression. In the medical field, bZIP transcription factors have been implicated in various diseases, including cancer, diabetes, and neurodegenerative disorders. For example, mutations in bZIP transcription factors have been identified in some types of cancer, and bZIP proteins have been shown to play a role in regulating the expression of genes involved in cell proliferation, differentiation, and apoptosis. Additionally, bZIP transcription factors have been implicated in the regulation of genes involved in insulin signaling and glucose metabolism, making them potential targets for the treatment of diabetes.
RNA, Plant refers to the type of RNA (ribonucleic acid) that is found in plants. RNA is a molecule that plays a crucial role in the expression of genes in cells, and there are several types of RNA, including messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). In plants, RNA plays a critical role in various biological processes, including photosynthesis, growth and development, and defense against pathogens. Plant RNA is also important for the production of proteins, which are essential for the structure and function of plant cells. RNA, Plant can be studied using various techniques, including transcriptomics, which involves the analysis of RNA molecules in a cell or tissue to identify the genes that are being expressed. This information can be used to better understand plant biology and to develop new strategies for improving crop yields, increasing plant resistance to diseases and pests, and developing new plant-based products.
DNA, or deoxyribonucleic acid, is a molecule that contains the genetic information of living organisms, including plants. In plants, DNA is found in the nucleus of cells and in organelles such as chloroplasts and mitochondria. Plant DNA is composed of four types of nitrogenous bases: adenine (A), thymine (T), cytosine (C), and guanine (G). These bases pair up in a specific way to form the rungs of the DNA ladder, with adenine always pairing with thymine and cytosine always pairing with guanine. The sequence of these bases in DNA determines the genetic information that is passed down from parent plants to offspring. This information includes traits such as plant height, leaf shape, flower color, and resistance to diseases and pests. In the medical field, plant DNA is often studied for its potential to be used in biotechnology applications such as crop improvement, biofuels production, and the development of new medicines. For example, scientists may use genetic engineering techniques to modify the DNA of plants to make them more resistant to pests or to produce higher yields.
Photoreceptors, plant refer to specialized cells in plants that are responsible for detecting and responding to light. These cells contain pigments called photopigments, which absorb light energy and trigger a series of chemical reactions that ultimately lead to changes in the plant's physiology and behavior. There are several types of photoreceptors in plants, including phototropins, cryptochromes, and phototropins. Phototropins are responsible for regulating plant growth and development, including phototropism (the bending of a plant towards a light source) and photoperiodism (the response to the length of day and night). Cryptochromes are involved in regulating plant responses to blue light, including the regulation of flowering time and seed germination. Phototropins are also involved in regulating plant responses to red and far-red light. In addition to regulating plant growth and development, photoreceptors are also involved in plant defense mechanisms. For example, some photoreceptors can detect the presence of herbivores or pathogens and trigger the production of defensive compounds. Overall, photoreceptors play a critical role in plant growth, development, and defense, and their study is important for understanding plant biology and improving crop yields.
In the medical field, "Steroids, Heterocyclic" refers to a class of organic compounds that contain a ring system with at least one heteroatom (such as nitrogen, oxygen, or sulfur) in addition to carbon atoms. These compounds are often derived from steroids, which are a group of hormones and other compounds that are naturally produced in the body. Heterocyclic steroids are used in a variety of medical applications, including as anti-inflammatory drugs, immunosuppressants, and contraceptives. Some examples of heterocyclic steroids include corticosteroids (such as prednisone and hydrocortisone), which are used to treat a wide range of inflammatory and autoimmune conditions, and progestins (such as levonorgestrel and medroxyprogesterone acetate), which are used as contraceptives and to treat certain types of cancer. It is important to note that the use of steroids, including heterocyclic steroids, can have potential side effects and risks, and should only be used under the guidance of a healthcare professional.
Hypocotyl
Late Elongated Hypocotyl
Memecylon pauciflorum
Epicotyl
Myrmecodia lamii
List of durian diseases and pests
Shade avoidance
Banksia speciosa
Banksia serrata
Mediator (coactivator)
Banksia blechnifolia
Banksia aculeata
Takuma Tanada
Tryptophol
Edible plant stem
Epigeal germination
Rubiaceae
Eledone massyae
P. Pardha Saradhi
Fraxinus profunda
Celery
Plant embryonic development
Etiolation
Repressilator
Seed
Coccinia
Gravitropism
Myrmecodia
Wisconsin Fast Plants
Ethylene (plant hormone)
Role of Cell Wall Calcium in Red Light- inhibited Elongation of Hypocotyls of Etiolated Phaseolus radiatus
Water Stress Hinders In Vitro Regeneration of Plants | IntechOpen
Publications of Alisdair Fernie | Max Planck Institute of Molecular Plant Physiology
"Effects of Mercury and Chromium on Peroxidase and IAA Oxidase Enzymes " by NAYNA G. PARMAR and SUMITRA CHANDA
Heirlooms are Obsolete - Biology Fortified Inc.
Abscisic acid induced a negative geotropic response in dark-incubated Chlamydomonas reinhardtii | Scientific Reports
Frontiers | Stress-Induced Accumulation of DcAOX1 and DcAOX2a Transcripts Coincides with Critical Time Point for Structural...
Leaf-chewing herbivores affect preference and performance of a specialist root herbivore | Oecologia
Plant biology-各期论文-万方医学网
Rooting Definition & Meaning - Merriam-Webster
Down & Dirty: Celeriac
Management Considerations for Irrigated Cotton - Cotton Incorporated
International Journal of Biology
S) | Dept. of Forest Genetics and Plant Physiology
Is fruit a monocot or dicot? - WittyQuestion.com
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
Pesquisa | Biblioteca Virtual em Saúde
Effect of Temperature, Light and Sowing Depth on Seed Germination of Celosia argentea L.
CoP: Co-expressed Biological Processes
Growth2
- Co-condensation with photoexcited cryptochromes facilitates MAC3A to positively control hypocotyl growth in Arabidopsis . (bvsalud.org)
- Additionally, our model produces complex responses to various light cues, such as extreme photoperiods and non-24 h environmental cycles, and can describe the control of hypocotyl growth by the clock. (nih.gov)