list the function of auxin, gibberelin, cytokinin, ethylene and abscisic acid
Answers
Cytokinins delay aging in leaves and flowers. Gibberellins elongate stem internodes in lettuce to elevate flowers and seeds for pollination and dispersal. Gibberellins stimulate breakdown of endosperm, growth of the embryo, and seed germination. Greenhouses use gibberellins to germinate dormant seeds
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.
Abscisic acid (ABA) is a plant hormone which functions mainly as a growth inhibitor. Abscisic acid promotes the dormancy in seeds and buds [ this is the opposite of breaking the dormancy]. It also promotes closing of stomata.
Ethylene serves as a hormone in plants. It acts at trace levels throughout the life of the plant by stimulating or regulating the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves.
Answer:
Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance).
Gibberellins are plant growth regulators that facilitate cell elongation, help the plants to grow taller. They also play major roles in germination, elongation of the stem, fruit ripening and flowering.
Cytokinins are plant hormones that cause increased cell division by stimulating the process of mitosis.
Ethylene serves as a hormone in plants. It acts at trace levels throughout the life of the plant by stimulating or regulating the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves.
One of the crucial functions of abscisic acid is to inhibit seed germination.
Explanation: