What are plant growth regulators in agriculture?
Plant growth regulators (PGRs) are chemicals used to modify plant growth such as increasing branching, suppressing shoot growth, increasing return bloom, removing excess fruit, or altering fruit maturity.
Who invented the plant growth regulators?
Auxins. The first phytohormone to be discovered is the Auxin and it was discovered by the biologist Charles Darwin. Auxins are one of the most important plant hormones. The chief naturally occurring auxin is indole-3 acetic acid – IAA and other related compounds.
What are 4 types of growth regulators used in the horticulture industry?
There are five groups of plant-growth-regulating compounds: auxin, gibberellin (GA), cytokinin, ethylene, and abscisic acid (ABA). For the most part, each group contains both naturally occurring hormones and synthetic substances.
What is the role of plant growth regulators in horticulture?
Plant growth regulators are used to modify a crop by changing the rate or pattern, or both, of its response to the internal and external factors that govern development from germination through vegetative growth, reproductive development, maturity, and senescence or aging, as well as postharvest preservation.
What are the plant growth regulators give example?
Examples are auxins, gibberellins and cytokinins. Plant Growth Inhibitors – These chemicals inhibit growth and promote dormancy and abscission in plants.
Who discovered auxin first?
botanist Fritz Went
The first persons associated with the discovery of auxins are Charles Darwin and his son Francis in the early 1880s. Isolation of auxin at the tip of the oat coleoptile in the gelatin block was first done by Dutch botanist Fritz Went in 1928.
Who discovered auxins?
botanist Fritz W. Went
In 1928, Dutch botanist Fritz W. Went finally isolated auxin diffused out from the tip of oat coleoptiles in the gelatin block. Following Went’s success, auxin, indole-3-acetic acid (IAA) was then isolated first from human urine, then from fungi, and finally from higher plants.
Who discovered gibberellic acid?
The first definitive evidence for the occurrence of gibberellins in plants was provided by Jake MacMillan and P.J. Suter, who isolated 2 mg of gibberellin A1 from 87.3 kg of immature seeds of runner bean (Phaseolus multiflorus, later reclassified as Phaseolus coccineus) (MacMillan and Suter 1958).