plant hormone


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

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 ?
This result may be related to factors intrinsic to the plant material used, such as cutting type, time of collection, plant hormones, and tissue age (PAULETTI et al., 2010).
Many bacteria and actinomycetes have been reported to produce plant hormones such as auxine and giberelic acid (Ponmurugan and Gopi 2006; da Silva Sousa et al., 2008; Saharan and Nehra 2011; Dias et al, 2013; Ngoma et al, 2013; Przemienieck et al, 2015).
Regarding gibberellins, this plant hormone influences germination, seedling growth, stem elongation, leaf development, bud outgrowth, flower induction, and xylem expansion (Gabriele et al., 2010; Ikezaki et al., 2010; Mauriat et al., 2011; Nadeau et al., 2011; Zhao et al., 2011; Taiz & Zeiger, 2013).
Multiple plant hormones play significant roles in many regulating processes in plants, such as growth and plant responses to stresses [22, 23].
Real-Time Polymerase Chain Reaction (PCR) Analysis of the Genes Involved in Plant Hormone Signal Transduction Pathways.
[16] were shown that plant hormones in general and auxins in particular, can significantly affect the uptake and further transport of nutrients within plants by regulating the sink action of developing tissues.
Salicylic acid, a plant hormone that fights microbial infections in leaves, also helps plants select which bacteria colonize their roots, researchers report online July 16 in Science.
THE MULTIFACETED ROLE OF ARABIDOPSIS THALIANA GCN2 (ATGCN2) KINASE IN PLANT HORMONE SIGNALING AND IMMUNE RESPONSES.
They compared the chemistry and flavor profile of tea plants that encountered the tea leafhopper (a sucking insect), the tea geometrid (a chewing insect) and the plant hormone methyl jasmonate (which mimicked the leafhopper).
Washington, Oct 17 ( ANI ): Researchers have revealed that spraying a plant hormone on broccoli boosts its cancer-fighting potential.
Although plant chromatin in general and histone proteins in particular as well as plant hormone signaling have been subjects of great interest during the last decade, the number of review articles concerning the effect of plant hormones on plant chromatin pattern are limited.
Plant hormone auxin is involved in the control of several and distinct processes, such as embryogenesis, all types of organogenesis, root meristem maintenance, vascular tissue differentiation, hypocotyl and root elongation, apical hook formation, apical dominance, fruit ripening, growth responses to environmental stimuli, and others [1, 2].