Plant hormones. Hormones from Gr. to excite natural chemical messengers transported to target cells minute concentrations = substantial change growth.

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KEY CONCEPT Plant hormones guide plant growth and development.
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Presentation transcript:

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 growth responses organs curve towards (+) or away from (-) a stimulus ex. phototropism, thigmotropism, gravitropism

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

Went experiment

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