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16 Cards in this Set
- Front
- Back
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Auxin controls what?
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Regulation of elongation growth in young stems and coleoptiles. also, stimulation of adventitous root formation
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where is auxin mainly located in the cell?
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the cytosol and the chloroplasts
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where is auxin synthesized?
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primarily in the apical bud and is transported polarly to the root
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the vast majority of auxin is found in what state?
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bound to other molecules
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what do giberellins do?
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induce dramatic internode elongation in certain types of plants and grasses, regulate fruit growth, and play a role in germination
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where are giberellins produced?
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in roots, young leaves and seeds
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how does it promote stem growth?
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by promoting cell elongation and division
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what else does it promote?
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the production of amylase
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what is ABA?
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abscisic acid, which is an inhibitory hormone
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what does ABA do?
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causes stomata to close, and promotes bud and seed dormancy
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why do plants produce ethylene?
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in response to stresses and barriers in the soil, occurs in fruit ripening and programmed cell death, in response to high outer conc of auxin
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what are the three parts of the triple response?
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slowing of stem elongation, thickening of the stem, curving to grow horizontally
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blue light is effective in what?
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phototropism, slowing of hypocotyl elongation when a seedling germinates, and light-induced opening of stomata
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what are the blue light receptors?
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cryptochromes, phototropin and zeaxanthain
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what does red light do?
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stimulate seed germination, slow hypocotyl elongation, stimulate cotyledon expansion, and flowering time regulation
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what detects red light?
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phytochromes
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