plant hormone


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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 ?
Auxin is the first plant hormone studied and it has been correlated with several developmental processes like root initiation, apical dominance, plant growth, geotropism and phototropism and fruit development (Paciorek & Friml, 2006).
Abscisic acid-related compounds have great potential as tools for determining how the plant hormone functions in plants.
It is now believed that virtually all plant growth and developmental processes rely on controlled levels of, and responses to, the plant hormone auxin.
TDZ, a synthetic version of a naturally occurring plant hormone known as a "cytokinin," is not new.
Ethephon (Florel Fruit Eliminator), a natural plant hormone, prevents the formation of unwanted fruit on just about any leafy ornamental tree.
More than 70 years after biologists identified the powerful plant hormone auxin, they have finally found how plant cells detect it.
54 percent ranked as "valuable") A gene that produces a plant hormone that counteracts aging and keeps fruits and vegetables fresh longer was recently discovered at the University of Leeds in the United Kingdom.
A plant hormone connection with the disease was based on the fact that exogenous auxins and cell-division factors were not required for cell cultures of tumors but were for nontumorous cultures (Brown & Gardner, 1936; Klein & Link, 1952).
In research completed in 1989, Jones identified a protein he believed to be the receptor to auxin, a major plant hormone that causes cells to grow, expand, and change form.
Wholegrain foods have higher fibre and plant hormone content, and are major sources of minerals.
Washington, July 19 ( ANI ): Researchers have discovered that abscisic acid, a natural plant hormone with known beneficial properties for the treatment of disease, has anti-inflammatory effects in the lungs as well as in the gut.