plant hormone

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Related to Plant hormones: Plant growth regulators

plant hormone

any of several chemical substances produced in very low concentrations in plants, that control growth and development. They are now usually called growth substances. Plant HORMONES are produced in active MERISTEMS (e.g. root and shoot apices) from where they diffuse to other parts of the plant. A distinct contrast with animal hormonal systems is the fact that plants do not possess specific tissues for hormone production, nor a well-defined distribution system equivalent to the blood system.

Plant hormones are classified generally into several groups, discussed under separate headings: ABSCISSIC ACID, AUXINS, CYTOKININS and GIBBERELLINS.

References in periodicals archive ?
There are many reports concerning the effect of plant hormones on histone modifications (presented in Table 2).
And ,partly as a result of the BSE scare, more people are eating soya, as a meat substitute, that contains female plant hormones.
Other plant hormones such as mepiquat chloride and gibberellins are extensively used in cotton plants and seed germination, and are expected to follow a similar trend with the growth of the textile industry.
The significant decrease in biomass yield in ABA treatment and increase in biomass and grain yield through foliar application of CK at first growth stage of the seed show clearly the different effects of these two plant hormones on the growth processes [8, 12].
When the day length reaches a given reduced amount, various plant hormones are activated.
Previous research suggested that plant hormones called brassinosteroids (BRs) might be an answer to the problem.
He begins with basic issues such as plant hormones and the cytoskeleton of plant cells and progresses to phylogeny, taxonomy, gene duplication, the regulation of gene expression and systems biology.
The new protocol simultaneously analyzes interactions between multiple plant hormones, fatty acids, pathogen-derived elicitors, and other volatile organic compounds.
The answer may well lie in what they eat - a diet mainly based on plant foods which includes plant hormones called phytoestrogens.
Then researchers demonstrated they could make such blobs of tissue grow into either roots or shoots depending on the ratio of two critical plant hormones, auxins and cytokinins.
Research on the main details of crown gall disease may be completed in the 2000s, but major information is still needed regarding the incorporation of the T-strand into the plant nucleus and the subsequent steps producing plant hormones and opines in the plant cytoplasm.
Biochemists at the University of Missouri-Columbia are studying the plant hormones cytokinin and auxin and the genes that switch hormone production on and off at different times and places within the plant.