• We characterize early patterning during de novo development of the Arabidopsis shoot meristem using fluorescent reporters of known gene and protein activities required for shoot meristem development and maintenance. (biologists.com)
  • We propose that de novo shoot meristem induction is an easily accessible system for the study of patterning and self-organization in the well-studied model organism Arabidopsis . (biologists.com)
  • Distinguished from the raceme-type inflorescences of Arabidopsis and panicle-type inflorescences of rice, tomato has a cyme-type inflorescence lacking a main axis, which initiates from a sympodial inflorescence meristem (SIM). (nature.com)
  • When researchers wanted to turn off an interesting gene a couple of years ago, they often had to leave their favourite model species and turn to Arabidopsis. (plantsandpipettes.com)
  • The shedding of floral organs (or leaves) can be easily studied in a model plant called Arabidopsis. (elifesciences.org)
  • This review will focus on the four-floral inductive pathways which operate in Arabidopsis: Photoperiodic, autonomous, gibberellin promotion, and vernalization pathways and how in this network of pathways, different nodes signify a site of signal integration and how the pathways are integrated, leading to a co-ordinated initiation of flowering. (jabonline.in)
  • Upon elimination of PNY (PENNYWISE) and PNF (POUNDFOOLISH) function in Arabidopsis , SAM remained in a vegetative state as it could not perceive the inductive signals, which suggested the connection between meristem architecture and their response potential to floral stimuli [ 3 ]. (jabonline.in)
  • Among them, class A genes, such as APETALA1 ( AP1 ) in Arabidopsis , specify the outer-most floral organs, the sepals. (biomedcentral.com)
  • The Arabidopsis CLAVATA3 (CLV3) gene encodes a small-secreted polypeptide that is expressed in the shoot and floral stem cells and perceived by several receptor complexes at the surface of the underlying cells. (berkeley.edu)
  • In addition to the CLV3 pathway, we have identified the Arabidopsis ULTRAPETALA1 (ULT1) locus as an important negative regulator of shoot and floral stem cell activity. (berkeley.edu)
  • We are currently studying the roles of several CLE polypeptides in Arabidopsis shoot apical meristem function and leaf formation. (berkeley.edu)
  • Flowering plants often exhibit declining investment in gametes, seeds, and floral organs among sequentially blooming flowers within inflorescences. (qubs.ca)
  • Moreover, all floral organs (pistil, stamens, spurs, sepals) increase in size throughout floral development until the flowers fall apart (Griffin et al. (qubs.ca)
  • Hydathodes are small organs located on the leaf margins of all vascular plants. (researchgate.net)
  • Most euAP2 genes were highly expressed in the floral organs, suggesting their specific functions in flower development. (biomedcentral.com)
  • The flowering plants (also angiosperms or Magnoliophyta ) are one of the major groups of modern plants , comprising those that produce seeds in specialized reproductive organs called flowers , where the ovulary or carpel is enclosed. (academickids.com)
  • Perhaps the most striking characteristic of roots that distinguishes them from other plant organs such as stem-branches and leaves is that roots have an endogenous [5] origin, i.e. , they originate and develop from an inner layer of the mother axis, such as pericycle . (wikimili.com)
  • Plants can shed their leaves, flowers or other organs when they no longer need them. (elifesciences.org)
  • Knott [ 6 ] demonstrated by restricting spinach leaves and SAM to lighting and shading that leaves are the organs where inductive signals originate. (jabonline.in)
  • It's a cellular process in which cells form different plant organs, such as shoots, floral, or root tissues. (plantcelltechnology.com)
  • The majority of the gene ontology terms and Kyoto Encyclopedia of Genes and Genomes pathway enrichment responses were for membrane-building and ploidy-related processes, consistent with the excessive floral organs and altered cell size observed in the mutant. (biomedcentral.com)
  • it consists of (one or more) pistils and is typically surrounded by the pollen -producing reproductive organs , the stamens , collectively called the androecium . (wikipedia.org)
  • however, PISTILLATA and FT expression peaked on day 40 after ethylene treatment when the fruit and floral organs were forming, indicating an important role in floral organ and fruit development 14 , 15 . (nature.com)
  • They also produce daughter cells that form organs such as leaves, stems and flowers. (berkeley.edu)
  • The pollen (male spores) and ovules (female spores) are produced in different organs, but the typical flower is a bisporangiate strobilus in that it contains both organs. (fullgardens.com)
  • In addition, FALSIFLORA ( FA ), the tomato ortholog LEAFY , controls flowering time and floral meristem identity. (nature.com)
  • The leafy portion of the plant produces gametes, and a fertilized egg then develops into the spore-producing plant, which is just the stalk and sporangium. (blogspot.com)
  • LEAFY plant-specific transcription factors, which are key regulators of flower meristem identity and floral patterning, also contribute to meristem activity. (researchgate.net)
  • Relatively short secondary shoots arise from axillary meristems subtended by small cauline leaves on the primary shoot and are also terminated by individual flowers (2° flowers). (qubs.ca)
  • Even shorter 3° shoots arise from axillary meristems on 2° shoots, and so on. (qubs.ca)
  • Meristems can be formed either during embryogenesis or during the plant's life such as, for instance, axillary meristems. (researchgate.net)
  • While the shoot apical meristem (SAM) formed in the embryo only contributes to the main stem, the branched structure observed in many plants relies on axillary meristems (AMs) formed post-embryonically. (researchgate.net)
  • Primordia initiation is the precursor for the start of a primordium, and typically confers new growth (either flowers or leaves) in plants once fully mature. (wikipedia.org)
  • At least in wheat plants, leaf primordium initiation rates increase with increasing ambient temperature, and the leaf number of some varieties decrease with increasing daylength. (wikipedia.org)
  • Furthermore, we demonstrate a functional requirement for WUS activity during de novo shoot meristem initiation. (biologists.com)
  • Either from mutation, or some other force not clearly understood, some meristem cells flatten out, and elongate, producing wide flat stems that may curl in a most unusual way. (deborahsilver.com)
  • Some floral supply places carry dried fantail willow, but I prize the the fresh cut stems. (deborahsilver.com)
  • Some plants may produce stems like this intermittently-these are called witches brooms, after the look of that proliferation of branches. (deborahsilver.com)
  • Some common explants used in tissue culture processes include leaves, stems, meristem, and floral sections. (plantcelltechnology.com)
  • The term gynoecium is also used by botanists to refer to a cluster of archegonia and any associated modified leaves or stems present on a gametophyte shoot in mosses , liverworts , and hornworts . (wikipedia.org)
  • Lisianthus mature rapidly, and produce beautiful funnel-shaped flowers growing on long straight stems. (fountainofplants.com)
  • STM3 is expressed in both vegetative and reproductive meristematic tissues and in leaf primordia and leaves, indicative of its function in flowering time and inflorescence-branching development. (nature.com)
  • Although flower and inflorescence development has not been studied in fine detail, there are no indications of floral preformation. (qubs.ca)
  • The floral meristem emerges as a lateral outgrowth from the periphery of the inflorescence meristem. (ens-lyon.fr)
  • Stage 1 is the formation of a bump at the periphery of the inflorescence meristem, stage 2 begin at when a border appears between the meristem and the developing flower. (ens-lyon.fr)
  • Induction of new shoot meristems from cultured root explants is a widely used, but poorly understood, process in which apical plant tissues are regenerated from adult somatic tissue through the de novo formation of shoot meristems. (biologists.com)
  • These models give tools to represent meristem or others plant tissues. (ens-lyon.fr)
  • It's the process of introducing dome-shaped meristematic tissue (shoot apical meristem or root apical meristem) and auxiliary shoots in nutrient media under controlled lab conditions for the regeneration of a whole plant. (plantcelltechnology.com)
  • Fall-flush shoots were sampled in early November 2002 to minimize the number of floral shoot meristems. (citrusgenomedb.org)
  • KNOX gene expression is not restricted to the spur-bearing petal, indicating that additional components are required to define nectar spur position, e.g. canonical ABC genes, determinants of floral zygomorphy, and additional (currently unknown) factors. (cam.ac.uk)
  • However, the comparative transcriptome analysis of two spinach accessions with different bolting times identified genome-wide gene expression profiling and large-scale discovery of flowering-related genes from vegetative and reproductive leaves [ 13 ]. (biomedcentral.com)
  • Transcriptome analysis shows that several floral development-related genes are affected by STM3 mutation. (nature.com)
  • Three euAP2 genes ( BnaAP2-1 , BnaAP2-5 and BnaTOE1-2 ) might be regarded as floral suppressors. (biomedcentral.com)
  • MiR172 and its target genes play key roles in flowering time and floral organ differentiation. (biomedcentral.com)
  • Transcriptome analysis and genetic interactions revealed shared and divergent functions of miR156-targeted SlSBP genes, PROCERA/DELLA and the classical WUSCHEL/CLAVATA pathway, which has been previously associated with meristem size and determinacy. (bvsalud.org)
  • The stem cells in the meristem begin to grow, and are then rapidly switched from 'leaf/branch' to 'flower' mode as a whole slew of genes for flower formation are kicked into gear. (plantsandpipettes.com)
  • There were 29 MADS-box genes, as well as a large number of floral-related regulators and hormone-responsive genes, considered as candidates regulating floral patterning of C. goeringii . (biomedcentral.com)
  • Genes controlling floral organ identity have been identified through the genetic analysis of homeotic mutants, leading to the ABCDE model, in which five classes of regulatory genes (A, B, C, D and E) work in a combinatorial manner to confer the organ identities of the four whorls [ 10 ]. (biomedcentral.com)
  • Floral integrator genes such as FT , SOC1 , and AGL24 , converge various cues and activate the floral identity genes (e.g. (nature.com)
  • Only a few genes are necessary to confer floral meristem identity. (ens-lyon.fr)
  • Plants produce both leaf and flower primordia cells at the shoot apical meristem (SAM). (wikipedia.org)
  • These new leaves form near the top of the shoot and resemble knobby outgrowths or inverted cones. (wikipedia.org)
  • Primordia are initiated by local cell division and enlargement on the shoot apical meristem. (wikipedia.org)
  • The main growing point (apical meristem) of the shoot is in a vegetative stage, producing new leaves. (johnsonsofpikeville.com)
  • Although principally involved in maintaining indeterminacy in the shoot apical meristem (SAM), members of the KNOX gene family have been co-opted in the evolution and development of compound leaves where they suppress differentiation and extend the morphogenetic potential of the leaf. (cam.ac.uk)
  • A larger vegetative shoot apical meristem (SAM) often produces more branching inflorescences. (nature.com)
  • The formation of new meristems is essential for the plastic expansion of the highly branched shoot and root systems. (researchgate.net)
  • The familiar duckweed which covers the surface of a pond consists of a tiny green "thalloid" shoot, one, that is, which shows no distinction of parts?stem and leaf, and a simple root growing vertically downwards into the water. (academickids.com)
  • The great forest-tree has a shoot, which in the course perhaps of hundreds of years, has developed a wide-spreading system of trunk and branches, bearing on the ultimate twigs or branchlets innumerable leaves, while beneath the soil a widely-branching root-system covers an area of corresponding extent. (academickids.com)
  • The subsequent studies considered that higher plants share two essential features of floral transition: Generation of floral stimulus in leaves and its transport to the target, shoot apical meristem (SAM), which must be competent to receive it [ 2 ]. (jabonline.in)
  • 2016) utilized Illumina sequencing to integrate transcriptomic changes shoot apical meristems of floral buds in response to ethylene 16 , indicating that LTI, FT , and VRN1 involved in the process of floral development. (nature.com)
  • This structure is derived from a reservoir of stem cells located at the growing tip, called the Shoot Apical Meristem (SAM). (berkeley.edu)
  • Federici and Mu (Roose lab) harvested meristems only from trees that appeared to be healthy and had a large number of young shoot tips on the day of collection. (citrusgenomedb.org)
  • In essence, a flower structure forms on a modified shoot or axis with an apical meristem that does not grow continuously (growth is determinate). (fullgardens.com)
  • A key question in biology is how changes in gene function or regulation produce new morphologies during evolution. (cam.ac.uk)
  • While the regulation of the stem cell population in an established meristem is well described, how it is initiated in newly formed meristems is less well underst. (researchgate.net)
  • Based on a high-quality genome assembly, mRNA sequencing (mRNA-seq) data, and single-cell RNA-seq data for the lycophyte Selaginella kraussiana, we show that the two root origin events in lycophytes and euphyllophytes adopted partially similar molecular modules in the regulation of root apical meristem (RAM) development. (bvsalud.org)
  • However, functional genomic studies and the gene discovery associated with floral pattern regulation remains greatly limited in C. goeringii [ 6 ]. (biomedcentral.com)
  • Precise regulation of stem cell activity is essential to balance tip growth with organ formation, and the ability to maintain a dynamic equilibrium of meristem cells is critical for plants to achieve their characteristic architecture. (berkeley.edu)
  • In flowering plants, a floral primordium gives rise to a flower. (wikipedia.org)
  • Although it is a frequently used term in plant biology, the word is used in describing the biology of all multicellular organisms (for example: a tooth primordium in animals, a leaf primordium in plants or a sporophore primordium in fungi. (wikipedia.org)
  • Though primordia are typically only found in new flower and leaf growth, root primordia in plants can also be found, but are typically referred to as lateral root primordium or adventitious roots. (wikipedia.org)
  • the carpel margin meristem (arising from the carpel primordium ) produces the ovules , ovary septum, and the transmitting track, and plays a role in fusing the apical margins of carpels. (wikipedia.org)
  • Lenient grazing is advised until such time as haplocorm buds are capable of producing prompt competitive regrowth. (johnsonsofpikeville.com)
  • These responses indicate that NAA can trigger floral development within vegetative buds relatively late in the summer and outside of the time period when it is generally believed possible to influence flower bud formation. (ashs.org)
  • Note the elongated the leaf buds set for spring. (deborahsilver.com)
  • However, constitutive expression of class 1 KNOX proteins in transgenic tobacco produces flowers with ectopic outgrowths on the petals, indicating that KNOX proteins alone are, to some degree, capable of inducing structures similar to nectar spurs in a heterologous host. (cam.ac.uk)
  • To stop meristem growth, other proteins bind to the genetic control elements of Wuschel and block its expression. (plantsandpipettes.com)
  • Using a GFP-tagged bri1-120 construct, we detected the bri1-120 protein in the plasma membrane, and showed that the phenotypic defects in the rosette leaves of bri1-301 , a kinase-inactive weak allele of BRI1 , can be restored by the overexpression of the bri1-120 proteins in bri1-301 . (biomedcentral.com)
  • Wenatchee, WA) at ≈14-day intervals beginning 50 days after bloom indicated that the time of floral transition (doming of the meristem apex) occurred during the period from 65 to 105 days after bloom at each location. (ashs.org)
  • For the occurrence of floral transition at an opportune time, these regulatory mechanisms integrate varied environmental cues with the endogenous physiological ones. (jabonline.in)
  • For understanding the underlying mechanisms of floral transition, genetic models have been developed based on the physiological studies carried on in the last century and the current molecular studies. (jabonline.in)
  • After discovering photoperiodic floral induction [ 1 ], many physiological studies have been carried on with the flowering transition. (jabonline.in)
  • The SAM occurs in two states, the incompetent state, unable to perceive signals of floral induction, and the competent state, capable of interpreting signals and leading to flowering transition. (jabonline.in)
  • microRNAs such as miR156 and miR172 and their corresponding targets are the key regulators of the phase changes in the floral transition [ 4 ]. (jabonline.in)
  • introduce hydathodes, an oft-overlooked plant organ that acts as a pressure valve to expel excess guttation sap at the leaf margin, typically visible at dawn. (researchgate.net)
  • Another challenge will be to find out where IDA is produced in the plant and what causes it to accumulate in specific places in preparation for organ shedding. (elifesciences.org)
  • Here, any organ of the plants, such as leaf, stem, or root is used as an explant, cleaned, and introduced in a culture medium under sterile lab conditions. (plantcelltechnology.com)
  • The placentas and/or ovule(s) may be born on the gynoecial appendages or less frequently on the floral apex. (wikipedia.org)
  • Cytokinins regulate root apical meristem size and promote lateral root elongation. (wikimili.com)
  • Lateral branches toward the top of the plant tend to stay shorter, which leads to a large central cola on the apical meristem. (sensiseeds.com)
  • stamen and produces and contains the pollen. (uctomonika.cz)
  • Pollen culture: It's the process of producing haploid plants by introducing pollen grains under controlled aseptic conditions on artificial nutrient media. (plantcelltechnology.com)
  • Androecium (from Greek andros oikia: man's house): one or two whorls of stamens, each a filament topped by an anther where pollen is produced. (fullgardens.com)
  • Then one finds six stamens which produce the pollen, and in the fourth whorl, the gynoecium, composed of two carpels which produce ovules. (ens-lyon.fr)
  • There are two alternate forms of every sexually-reproducing plant, one that produces spores and one that produces gametes. (blogspot.com)
  • The gynoecium is often referred to as the " female " portion of the flower, although rather than directly producing female gametes (i.e. egg cells ), the gynoecium produces megaspores , each of which develops into a female gametophyte which then produces egg cells. (wikipedia.org)
  • After a suitable period of development, this growing point is gradually transformed into a floral bud which soon produces a rudimentary seedhead. (johnsonsofpikeville.com)
  • Plant aerial development relies on meristem activity which ensures main body plant axis development during plant life. (researchgate.net)
  • Many developmental processes associated with fruit development occur at the floral meristem (FM). (bvsalud.org)
  • These factors have been known for a while, having been discovered by researchers interested in floral development. (plantsandpipettes.com)
  • However, the current understanding of the molecular mechanisms of floral patterning and multi-tepal development is limited. (biomedcentral.com)
  • [1] Gynoecium development and arrangement is important in systematic research and identification of angiosperms , but can be the most challenging of the floral parts to interpret. (wikipedia.org)
  • Its development is well described and is divided into several 'developmental stages', from floral to seed dispersal [ 1 ]. (ens-lyon.fr)
  • But how does a leaf or a flower know when to let go? (elifesciences.org)
  • This is where the carpel comes in (, pin-shaped, and features a sac at its base in the, center of a flower, and this sac is the ovary that produces and contains developing, Moving upward, the ovary extends to support a style, that is a. tube-like structure leading up to the stigma at the very top. (uctomonika.cz)
  • The first flower to expand (F1) terminates the spikelet axis, whereas the second flower (F2), ensheathed by an addorsed prophyll, develops in the axil of the last bract produced on the axis. (lookformedical.com)
  • gynoecia ) is most commonly used as a collective term for the parts of a flower that produce ovules and ultimately develop into the fruit and seeds . (wikipedia.org)
  • [note 1] A carpel is the female reproductive part of the flower-usually composed of the style, and stigma (sometimes having its individual ovary, and sometimes connecting to a shared basal ovary) -and usually interpreted as modified leaves that bear structures called ovules , inside which egg cells ultimately form. (wikipedia.org)
  • The biological function of a flower is to mediate the union of male sperm with female ovum in order to produce seeds. (fullgardens.com)
  • A flower is regarded as a modified stem with shortened internodes and bearing, at its nodes, structures that may be highly modified leaves. (fullgardens.com)
  • If the flower has no stem but forms in the axil of a leaf, it is called sessile. (fullgardens.com)
  • When one flower is produced, the stem holding the flower is called a peduncle. (fullgardens.com)
  • In contrast, aspects of floral morphology including sepal size, nectar spur length, and herkogamy showed little or no sequential variation and were relatively insensitive to experimental manipulation of resources. (qubs.ca)
  • Root morphology is divided into four zones: the root cap, the apical meristem , the elongation zone, and the hair. (wikimili.com)
  • Various mutations occur frequently in this orchid family, which greatly diversify the floral morphology and provide substantial commercial value. (biomedcentral.com)
  • On the other hand, transgenic plants produced from mature tissue via genetic transformation can drastically shorten flowering and fruiting time and thus speed up field evaluation studies. (springer.com)
  • Mature plants produce one or rarely two panicles of large flowers. (qubs.ca)
  • In bryophytes, the main plants - the green mats that spread and live for many years - are the gamete-producing generation, just like their algal ancestors. (blogspot.com)
  • Tree ferns are vascular plants, and their spore-producing generation is the main plant that can get quite tall. (blogspot.com)
  • Well something like that did happen in the ancestors of the vascular plants, and their spore-producing generation became the dominant conspicuous one, inventing lignin and xylem as a means to become ever taller. (blogspot.com)
  • In plants, stem cells are embedded in structures called meristems. (researchgate.net)
  • [4] The first root in seed producing plants is the radicle , which expands from the plant embryo after seed germination. (wikimili.com)
  • The majority of flowering plants have "perfect" flowers which contain both male and female reproductive structures (Figure 2a), although some species produce "imperfect" flowers with only female (Figure 2b) or male (Figure 2c) structures. (uctomonika.cz)
  • Floral inductive signals induce the transformation of SAM into a floral meristem, and plants' flowering time could be affected by growing them in varying day lengths such as shortening day length by shading or increasing the day length by incandescent light bulbs [ 5 ]. (jabonline.in)
  • Chailakhyan [ 7 ] revealed that in Perilla frutescens and Chrysanthemum , grafting of induced leaves (donor) on recipient non-induced plants results in the recipient's early flowering. (jabonline.in)
  • The process is mainly used for plants that produce low levels of viable seeds or non-albuminous tiny seeds. (plantcelltechnology.com)
  • These data could also be used as an important resource for investigating the genetics of floral morphogenesis and various biological mechanisms of orchid plants. (biomedcentral.com)
  • Flowering plants are heterosporangiate, producing two types of reproductive spores. (fullgardens.com)
  • We also produced bri1-301 mutants that were wild type in appearance by performing a genetic cross between bri1-301 and bri1-120 plants. (biomedcentral.com)
  • This vitally important meristematic zone contains cells which account for the central stalk (culm) as well as cells which account for the leaves. (johnsonsofpikeville.com)
  • The jointless ( j ) mutant produces indeterminate inflorescences that revert to vegetative growth after the production of two or three flowers 16 , 17 . (nature.com)
  • Marker‐gene assays also failed to show that early flowers consistently produced a greater proportion of high‐quality outcrossed progeny. (qubs.ca)
  • First flowers are not located closer to the basal leaves and roots than later flowers. (qubs.ca)
  • Whole inflorescences and individual flowers develop from extremely small meristems during the current flowering season. (qubs.ca)
  • Overcoming such checkpoints enables SAM to transform into floral meristem to produce flowers, and this transformation is induced by intrinsic and extrinsic stimuli that generate floral signals. (jabonline.in)
  • In recent systematic treatments of the Cyperaceae, spikelets of all but the most primitive tribes have been considered to be indeterminate, whereas historically the number of flowers, floral sex and distribution of sexes in spikelets have been important characters in suprageneric classifications. (lookformedical.com)
  • This 85% indica-dominant strain is known for producing large yields of heavily relaxing flowers. (sensiseeds.com)
  • In Anemone, for instance, flowers are solitary with five or six or more perianth leaves which are petaloid. (aiousolvedassignment.com)
  • An effective chemical fruit thinning program reduces the number of fruit per tree or per spur, thereby increasing the probability that the terminal axillary meristem on a flowering or fruiting spur will develop reproductive structures. (ashs.org)
  • The physiological analysis and dissection of floral induction were made by introducing an experimental system based on the understanding that an external controllable stimulus can cause flowering when applied to a specific plant. (jabonline.in)
  • In their night break studies (utilizing brief light exposure for interruption of extended night period), they established that duration of night controls SD plant's floral induction and not the day's length. (jabonline.in)
  • Leaf primordia are groups of cells that will form into new leaves. (wikipedia.org)
  • A cis-regulatory element (CRE) analysis suggested that the euAP2 s were involved in the response to light, hormones, stress, and developmental processes including circadian control, endosperm and meristem expression. (biomedcentral.com)
  • BnaAP2-1 , BnaAP2-5 and BnaTOE1-2 had higher expression levels in late-flowering material than early-flowering material based on RNA-seq and qRT-PCR, indicating that they may act as floral suppressors. (biomedcentral.com)
  • Integrated mRNA and miRNA profiling data provided comprehensive gene expression information on the wild-type and multi-tepal mutant at the transcriptional level that could facilitate our understanding of the molecular mechanisms of floral patterning of C. goeringii . (biomedcentral.com)
  • For example, the stem is thicker and has harder tissue compared to the leaf section, thus, the sterilization and culturing processes might differ. (plantcelltechnology.com)
  • Evolutionary biology Evolutionary biology is the subfield of biology that studies the evolutionary processes (natural selection, common descent, speciation) that produced the diversity of life on Earth. (theinfolist.com)
  • Each plant produces a basal rosette of 1-5 ternate leaves, which is likely the main site of photosynthesis. (qubs.ca)
  • The electron transport system, photosystem-II (PS-II), in chroloplast from spinach leaves was inhibited by the quinone in a similar way to that of the triazin sires herbicide, atrazin, with its mode of action against PS II. (lookformedical.com)
  • Sperm cells can swim only a short distance but must reach an egg on another plant - a difficult proposition for fragile cells produced on a tree top. (blogspot.com)
  • Sperm cells produced on a large gametophyte tree would be left literally "high and dry. (blogspot.com)
  • Thorns develop from branches, but rose spikes develop from modified epidermis cells, making them prickles (similarly, the spines on a cactus are modified leaves). (plantsandpipettes.com)
  • They observed what was known before: the meristem grows, the stem cells divide until they stop and the whole structure hardens and forms a pointy end. (plantsandpipettes.com)
  • As the name implies, Big Bud produces big yields, which has always been a quality people look for when choosing seeds. (sensiseeds.com)
  • 2014 ). The available genetic and biochemical evidence suggests that IDA and HAESA together control floral abscission, but it is poorly understood if IDA is directly sensed by the receptor kinase HAESA and how IDA binding at the cell surface would activate the receptor. (elifesciences.org)