Plant hormones.

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

Plant hormones

Hormones Hormone – Gr. « to excite » Natural chemical messengers that are transported to target cells Minute concentrations needed to induce a substantial change Growth regulators

Plants respond to stimuli

Plant hormones coordinate growth, development and responses to stimuli Tropisms Growth response resulting in plant organs curving towards or away from a stimulus Caused by hormones 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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