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Plant Hormones

Plant Hormones. Plant growth regulators. What does a plant need to respond to in its environment?. Light Water Gravity. Positively phototrophic. Positively geotrophic. Positively hydrotrophic. How are plant growth factors different from animal hormones?.

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Plant Hormones

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  1. Plant Hormones Plant growth regulators

  2. What does a plant need to respond to in its environment? • Light • Water • Gravity Positively phototrophic Positively geotrophic Positively hydrotrophic

  3. How are plant growth factors different from animal hormones? • They exert an influence by affecting growth • Produced and released by cells through out the plant rather than organs. • They affect the tissues or nearby tissues that release them, not distant target organs.

  4. Examples • Auxin – effects growth of the plant – example = IAA (the one you need to know about. • Cytokinins - growth control in fruit • Ethylene - promote ripening on the tree • Gibberellins – promote seed germination

  5. How IAA works

  6. Experiments • What doe these prove?

  7. Page 160 has the final lot of experiments explaining the action of IAA

  8. geotropism

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