What is the role of auxin,cytokinin,gibberlin,abscisic ?
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Auxin Hormone :
Elongate cells on the dark side of a stem so that plants bend towards the light.
Thus it helps in phototropism
Cytokinin :
This hormone causes cell division.
Gibberellin :
It is also called growth hormone.
It causes plant to grow taller.
Abscisic Acid :
It promotes falling of leaves.
Also promotes closing of stomata.
It is a stress hormone. It help plant to adapt to stress.
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Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance). They are produced in the stem, buds, and root tips. Example: Indole Acetic Acid (IA). Auxin is a plant hormone produced in the stem tip that promotes cell elongation.
Cytokinins are plant hormones that cause increased cell division by stimulating the process of mitosis. They are made naturally by plants but have been synthesized by humans.
Gibberellins are growth hormones that stimulate cell elongation and cause plants to grow taller. Gibberellins also have a role in other plant processes, such as stem elongation, germination, flowering, and fruit ripening.
ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure.
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