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Plant hormones

Plant hormones. Hormones. from Gr. to excite natural chemical messengers transported to target cells minute concentrations = substantial change growth regulators. Plants respond to stimuli. Plant hormones coordinate growth , development and responses to stimuli. Tropisms

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Plant hormones

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  1. Plant hormones

  2. Hormones • from Gr. to excite • natural chemical messengers transported to target cells • minute concentrations = substantial change • growth regulators

  3. Plants respond to stimuli

  4. Plant hormones coordinategrowth, development and responses to stimuli Tropisms • growth responses • organs curve towards (+) or away from (-) a stimulus • ex. phototropism, thigmotropism, gravitropism

  5. Studies on phototropism • towards or away from light • differential growth of cells on opposite sides of a shoot or coleoptile • cells on darker side elongate faster than those on the light side • experiments by Darwin and son and FW Went • due to auxin distributions

  6. Went experiment

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