Question

write detailed notes on physiological effect of plant growth regulators

Answer 1

Plant growth regulators(PGRs), regulate the growth of the plants. PGRs are just like the harmones produced in human body. They are also called as plant harmones or phytoharmones. These harmones are very essential for the plants for cell division, roots development,bud developement, stem elongation, branching etc.. But while culturing the plants using a plant tissue invitro(laboratory), the cells of the tissues are incapapable of producing these necessary harmones. So they have to be provided to the cells from the external source. Such artificially prepared plant growth regulators are called synthetic PGR. PGRs inclides auxin, cytokinin, giberellins, abscicic acid etc..

Answer 2

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Regulate abscission and dormancy. Inhibit plant growth, metabolism and seed germination. Stimulates closure of stomata in the epidermis. It increases the tolerance of plants to different kinds of stress and is, therefore, called 'stress hormone'