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Topic: Plant hormone

Related Topics

Plant growth substance

Auxin

Hormone

Fruit ripening

Germination

Amino acid

Methionine

Pollination management

Amylase

British

Jasmonates

Gibberellin

Brassinosteroids

Cytokinin

	plant hormone
		Unlike animal hormones, these substances are not produced by a particular area of the plant body, and they may be less specific in their effects.
		The two important stimuli for plants are light and gravity, and plants respond by growing either towards or away from the stimulus (this is termed tropism).
		Plant hormones are organic chemicals, and are usually referred to as ‘growth substances’.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0015158.html (360 words)

	HORMONE
		As plants grow their genotype is expressed in the phenotype which is modified by the environmental conditions that they experience.
		Plants do not have a circulatory system and "action at a distance" may not be a feature of plant hormones.
		Ethylene is the only gaseous hormone in the plant world; it is a simple hydrocarbon gas that is derived from the amino acid, methionine, via an unusual cyclic compound which is also an amino acid, ACC (1-aminocyclopropane-1-carboxylic acid).
	www.hcs.ohio-state.edu /hcs300/hormone.htm (727 words)

	HHMI News: Stitching Together a Receptor Reveals Plant Hormone Action
		Plant biologists have been hampered in their efforts to learn about plant signaling because they have had difficulty in developing techniques to obtain measurable biological responses when experimentally manipulating plant-signaling molecules.
		Brassinolide is a potent growth-promoting hormone that is believed to be a key element in the plant's response to light.
		To investigate brassinolide's role in BRI1 triggering, the researchers stitched the segment of the BRI1 receptor that normally sticks outside the plant cell, to the internal segment of the XA21 receptor that signals the rice cell to mount a response to infection.
	www.hhmi.org /news/chory2.html (841 words)

	Definition of Plant hormone
		Plant hormones (or plant growth regulators, or PGRs) are internally secreted chemicals in plants that are used for regulating their growth.
		The first assumption in both theories is that plants are interested in growing larger during the vegetative period of their life and this growth requires both good environmental conditions and an amount of the four basic nutrient groups that exceeds that needed to keep the plant at its current size.
		Stress hormones, in contrast, may be made in mature cells that are faced with a scarcity of nutrients and to a much lesser extent in young and meristematic cells faced with the same scarcity.
	www.wordiq.com /definition/Plant_hormone (632 words)

	Agdia product catalog
		Plant Growth Hormone Detection: Indole-3-acetic Acid Competitive ELISA
		Plant Growth Hormone Detection: Abscisic Acid Competitive ELISA
		Plant Growth Hormone Detection: trans-Zeatin Riboside Competitive ELISA
	www.agdia.com /catalog (260 words)

	Plant Glossary - EnchantedLearning.com
		In plant cells, ATP is produced in the cristae of mitochondria and chloroplasts.
		The axil of a plant is the angle between the upper side of the stem and a leaf, branch, or petiole.
		The axillary bud is a bud that develops in the axil (the angle between the stem and the leaf) of a plant.
	www.enchantedlearning.com /subjects/plants/glossary (1417 words)

	Biology 2402 Lecture Notes - Plant Hormones
		As a plant grows its physical traits, or phenotype, are the outcome of a complex interaction between its genetic instructions, or genotype, and the external environment.
		Hormones are not directly involved in metabolic or developmental processes but they act at low concentrations to modify those processes.
		Plant hormones are used extensively in agriculture, horticulture, and biotechnology to modify plant growth and development.
	www.ualr.edu /botany/hormone.html (512 words)

	Plant Hormones (Site not responding. Last check: )
		Theoretically, hormones are produced by a group or groups of cells, are transported through the organism, and bind to a receptor molecule that triggers a predicted activity within the cell.
		Hormones generally function in reaction to environmental cues and act almost as a nervous system for the plant in that they trigger some sort of response (usually growth).
		Plants that ‘bolt’ in fall (sudden stem lengthening) are being affected by gibberellins as are flowering, fertilization, seed production, and growth of fruits, new leaves and branches.
	www.lcbsbonsai.org /Newsletter/BasicBotany/Part08_PlantHormones.htm (1573 words)

	Botany online: Plant hormones - Phytohormones
		On one hand have plants no as efficient transport system as the blood circulation, on the other hand could no hormone that covers all mentioned criteria be isolated, and thirdly have plants no equivalent to the central nervous system of animals for the integration and co-ordination of all physiological activities.
		In contrast seem the receptors of plant hormones to be rather wide-spread and to differ in different cell types or developmental stages mainly by the affinity for their hormone.
		Plant hormone research has mostly been occupied with the hormones themselves, their synthesis, their distribution within tissues, their displacement, and their physiological effects.
	www.biologie.uni-hamburg.de /b-online/e31/31a.htm (1102 words)

	Plant Hormone K-12 Experiments for Lesson Plans & Science Fair Projects
		Measuring the ripening of unripe fruit induced by the plant hormone ethylene, by monitoring starch levels
		Plant hormones (or plant growth regulators, or PGRs) are internally-secreted chemicals in plants that are used for regulating the plants' growth.
		According to a standard definition, plant hormones are signal molecules produced at specific locations, occur in low concentrations, and cause altered processes in target cells at other locations.
	www.juliantrubin.com /encyclopedia/botany/planthormone.html (265 words)

	Plant Behavior Lecture (Site not responding. Last check: )
		Hormone binding to a specific receptor activates chemical and transport steps that generate second messengers, which trigger the cell's various responses to the original signal.
		In deciduous plants this triggers a series of metabolic steps which causes the reabsorption of valuable materials (such as chlorophyll) and their transport into the branch or stem for storage during the winter months.
		Those plants which need Short Days (actually a Long Night) to flower may be prevented from doing so by the same procedure, fooling them by apparently resetting their counting (clock) mechanism after the flash of light.
	home.earthlink.net /~dayvdanls/plant_behavior.html (2080 words)

	Hunt for a new plant hormone points to carotenoids
		Darwin was instrumental in discovering the first known plant hormone, auxin, and since then a handful of additional long-distance chemical messengers have been found in plants.
		The main role of this hormone is to regulate the degree of shoot branching.
		The hormone is apparently made throughout the plant, but hormone made in the roots is able to travel up the plant to influence branching in the shoot, suggesting that it may play a role in balancing root and shoot growth.
	www.eurekalert.org /pub_releases/2004-07/cp-hfa072004.php (400 words)

	Reference.com/Encyclopedia/Plant hormone
		Plant hormones (or plant growth regulators, or PGRs) are internally-secreted chemicals in plants that are used for regulating the plants' growth.
		According to a standard definition, plant hormones are signal molecules produced at specific locations, that occur in very low concentrations, and cause altered processes in target cells at other locations.
		The synthesis of plant hormones is more diffuse and not always localized.
	www.reference.com /browse/wiki/Plant_hormone (233 words)

	One Bad Apple Spoils the Whole Bunch: An Experiment on the Plant Hormone Ethylene
		The goal of this experiment is to measure the ripening of unripe fruit induced by the plant hormone ethylene, by monitoring starch levels using an iodine solution.
		These hormones are defined as substances produced in one location that have an effect on target cells in a non-adjacent location.
		Although most of the main plant hormones are transported in the vascular system of the plant, one class of hormones is transferred in gaseous phase.
	www.sciencebuddies.org /mentoring/project_ideas/PlantBio_p009.shtml (1298 words)

	Plant hormone Summary
		They are often called plant growth regulators to distinguish them from animal hormones that were discovered first and differ somewhat in their mode of action.
		Like their animal counterparts, plant hormones are effective in very small amounts, and tend to be synthesized at one site and transported elsewhere before they become functional.
		The hormone abscisic acid induces dormancy in perennial plants, and causes seeds to remain dormant.
	www.bookrags.com /Plant_hormone (439 words)

	UCSD biologists solve plant growth hormone enigma
		Gardeners and farmers have used the plant hormone auxin for decades, but how plants produce and distribute auxin has been a long-standing mystery.
		In Arabidopsis--a small plant favored by biologists because it is easy to manipulate genetically--Zhao's team inactivated combinations of the YUCCA genes and studied the effects of the inactivations on plant growth and development.
		The defects, including flowers with missing or misshapen parts, or deformations in the tissues that transport water and nutrients throughout the plant, differed depending on which combinations of genes were deleted.
	www.eurekalert.org /pub_releases/2006-07/uoc--ubs063006.php (686 words)

	A Start at a General Plant Hormone Theory (Site not responding. Last check: )
		This means that the effects they have appear unrelated and may merely use plant hormones like money as a currency to effect unrelated types of things or at least we are far from understanding the overall commonality to all of the effects each of the hormones have.
		The stress hormones (Abscisic Acid and Salicylic Acid) are perhaps made by all cells in equal amounts facing the same stress or release from stress conditions.
		If the plant, plant organs, or plant cells have been broadening (because of the presence of Cytokinin or Ethylene) they are changed to lengthening strategy of growth.
	www.planthormones.info /index.htm (3085 words)

	Plant Hormones and Adventitious Roots (Site not responding. Last check: )
		Hormones are chemicals produced by one part of a plant and transported to another part of the plant where they cause a reaction to occur.
		Hormones are stored within the plant until they are needed.
		The hormone is then transported up the plant to the dormant buds where they begin to open up and become active.
	herbarium.desu.edu /project_1/pages/64.html (385 words)

	Plant Growth Hormones
		The apex of a plant seems to produce hormones that signal the lateral buds of a plant to remain dormant.
		The decapitated plants were treated by removing the apical bud and any attached immature leaves and a terminal stub of the stem should still be evident.
		GA is a natural plant hormone and is routinely used to simulate grass growth in the"roughs" of golf courses and to cause seedless table grapes to grow to a full size.
	www.biologie.uni-hamburg.de /b-online/library/koning/Plants_Human/hormonelab.html (1208 words)

	Plant Hormones/Nutrition
		We now know, from the 1926 experiments of Frits Went, that auxin, a plant hormone produced in the stem tip (auxins promote cell elongation), moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant.
		is the plant response to the relative amounts of light and dark in a 24 hour period, and controls the flowering of many plants.
		Plant Biology (University of Maryland) Text, outlines, and images that are part of a general botany course.
	www.emc.maricopa.edu /faculty/farabee/biobk/BioBookPLANTHORM.html (2475 words)

	SparkNotes: Essential Processes of Plants: Terms
		Day-Neutral Plant - Plant in which blooming is not affected by photoperiod, so that flowering occurs independently of the duration of day and night.
		Hormone - A hormone is a chemical that affects the ways in which an organism functions; it is produced in one part of the plant body but, by traveling to target cells throughout the body, affects many other parts as well.
		Inhibitor - One in a class of plant hormones that inhibits growth and prolongs dormancy in buds and seeds.
	www.sparknotes.com /biology/plants/essentialprocesses/terms.html (972 words)

	Plant Hormone Theory
		The idea with the Shock/Synchronizer Hormones is that they are released under rapidly developing stress of any kind or return from stress good conditions, confronting the individual cells, parts of the plant, or the plant as a whole.
		The Shock/Synchronizer Hormones are the ABAs, and SAs.
		The Stress Hormones and ABA may all also need to be “in attendance” before cell death is “signed off on.” If this is true of cell division, the addition of SA may greatly increase the ease of raising calluses from single cells in tissue culture.
	www.pruittfamily.com /paul/theory.htm (5077 words)

	plant definition - Dictionary - MSN Encarta
		She planted the notion in my head that we should move.
		There did exist a Latin noun planta that meant "shoot, cutting," of uncertain origin, but the meaning of the English noun plant is not found.
		It is likely that this sense developed after the classical Latin period and is linked with the action of pressing on a shovel, or some other tool, with the "sole of the foot" in order to work the soil for planting.
	encarta.msn.com /dictionary_/plant.html (547 words)

	Newswise Science News \| Biologists Solve Plant Growth Hormone Enigma
		Gardeners and farmers have used the plant hormone auxin for decades, but how plants produce and distribute auxin has been a long-standing mystery.
		In Arabidopsis—a small plant favored by biologists because it is easy to manipulate genetically—Zhao’s team inactivated combinations of the YUCCA genes and studied the effects of the inactivations on plant growth and development.
		The defects, including flowers with missing or misshapen parts, or deformations in the tissues that transport water and nutrients throughout the plant, differed depending on which combinations of genes were deleted.
	www.newswise.com /articles/view/521686 (715 words)

	Plant Hormones
		Definition - Plant hormones are organic compounds produced in one part of the plant and is transported to another part of the plant, where in small quantities it causes a physiological response.
		A single aspect of growth and development can be influenced by several hormones: a particular response probably results from changing the ratios of hormones rather than from the presence or absence of an individual hormone.
		Shaking the plant causes ethylene to be produced, causing a restructuring of the microtubules in the cell walls resulting in shorter, thicker stems.
	carroll1.cc.edu /~jclausz/botany/PlantHormones.html (1140 words)

	Plant Hormone
		Some hormones are produced in one tissue and then transported to another tissue where they can give the physiological responses, that is, they can affect the growth or development of that tissue.
		Each hormone is made in small concentrations but can give a large effect on the growth and development of the plant.
		So which hormone takes the control on a tissue depends mainly on the comparative concentrations among the hormones present in that particular tissue.
	resources.emb.gov.hk /biology/english/environment/plant/plant_hormones.html (328 words)

	Abscisic Acid—The Plant Stress Hormone
		ARS plant physiologist Kay Walker-Simmons and chemist Sue Abrams, who's with the National Research Council of Canada, discovered features of the ABA molecule that affect wheat and barley plants.
		She believes that selecting plants that make this kinase faster or in greater abundance may enhance the plants' ability to withstand environmental stress.
		But because ABA is a key hormone in all plants, their findings may be useful for improving other crops, as well.
	www.ars.usda.gov /is/AR/archive/jan01/acid0101.htm (908 words)

	Plant Source Hormone Listing
		Thyroxin was isolated in 1915 and synthesized in 1928.
		The term "tannin" was first applied to plant extracts which when combined with the protein in hides prevented their putrefaction and influenced their conversion to the leather of 'tanned' hides.
		Tannins are of wide occurrence in plants and are usually found in greatest quantity in dead or dying cells.
	www.earthtym.net /50-ref-hormones-src.htm (4122 words)

	Plant Hormones
		The plant hormones website was set up initially at Long Ashton Research Station an institute of the BBSRC.
		All aspects of research may be discussed; synthesis extraction, purification, analysis, enzymology, molecular biology, hormone action etc. Requests for help on particular aspects may also be posted to the list as well as requests for standards, spectra, identification of spectra etc.
		The list may also be used for announcement of meetings, calls for papers and posters, visits of scientists to a particular area.
	www.plant-hormones.info (170 words)

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