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Growth and Inhibition Hormones in Plants
Introduction of Plant Hormones
Hormones are chemical signals that coordinate parts of an organism. Hormones trigger and relay responses between cells, either inducing or inhibiting. What brought the idea of these chemical signals was a property called phototropism, which is the tendency of plants to grow towards an area exposed with more light. Contrary to popular belief, the plant is not seeking out more light for photosynthesis, but the side that is less exposed if meerley growing faster due to hormones being secreted. The tip of most plants that show phototropism have a coleoptile which is a sheath that releases a growth hormone called auxin. Auxin, a growth hormone caused the more shaded area of the plant to elongate more than the illuminated side, causing a bend towards the light. Auxins
Auxins such as indoleacetic acid (IAA) function has growth hormones, and companion hormones (we will discuss this later on). Auxins stimulate stem elongation in plants, root growth, differentiation, and branching. Development of the fruit, apical dominance, phototropism, and garvitropism are also partly due to auxins. Cytokinins
Cytokinins such as zeatin are synthesized in the roots of plants and then transported via the xylem to other parts of the plant. Cytokinins affect root growth and differentiation , stimulate cell division and growth, stimulate germination and delay senescene (aging). Cytokinins can act as an anti-aging hormone because the inhibit the breakdown of proteins by stimulating RNA and protein synthesis. Many people spray cytokinin solution onto vegetation to slow down aging. Gibberllins
Gibberllins such as GA3 are found in the meristem of apical buds and roots, along with young leaves and the embryo. Gibberellins promote seed and bud germination, stem elongation, and leaf growth. They also stimulate flowering and the development of fruit. Abscisic Acid
Abscisic acid is found in the leaves, stems, roots, and unrippened fruit of plants. It inhibits growth, closes stomata, and counteracts breaking or dormancy. Ethylene
Ethylene are found in tissues of ripening fruits, nodes of stems, and aging leaves and flowers. It promotes ripening, opposes auxin effects, and inhibits development of roots, leaves, and flowers. |
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This intel was contributed by Frank
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May, 2012
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