 | Term | Definition |
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Auxin (IAA) |
Promotes plant growth by facilitating elongation of developing cells by increasing concentration of Hydrogen plus in primary cell walls, which activates enzymes that loosen cellulose fibers, which leads to increase in cell wall plasticity. In response, turgor pressurescauses cell wall to expand, generating growth. Produced at tips of shoots and roots |
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phototropism |
plant responses to light |
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geotropism |
plants responses to gravity |
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polar transport |
active transport from cell to cell in a specific direction. Auxin is a modified tryptophan amino acid and after synthesis, it goes through this process by means a chemiosmotic process |
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gibberellins |
group of plant hormones that promote cell growth; involved in promotion of fruit development and of seed germination, and the inhibition of aging in leaves |
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Gibberellic acid |
synthesized in young leaves, roots, and seeds but are often transported to other parts of the plant |
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bolting |
high concentrations of GA cause rapid elongation of stems; this can occur in rice plants when fungus that produces GA attacks the plant |
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Cytokinins |
group of hormones that stimulate cytokinesis (cell division); variations of the nitrogen base adenine. produced in roots and are transported throughout the plant; influence the direction of organ development; stimulate growth of lateral buds; been found to decay senescene of leaves and are sprayed on cut flowers and fruit to prolong their usefulness |
