plant hormones
DESCRIPTION
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?. - PowerPoint PPT PresentationTRANSCRIPT
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Plant HormonesPlant Hormones
Plant growth regulatorsPlant growth regulators
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What does a plant need to respond to in its
environment?
•Light•Water•Gravity
Positively phototrophicPositively geotrophic
Positively hydrotrophic
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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.
![Page 4: Plant Hormones](https://reader035.vdocument.in/reader035/viewer/2022062314/56813b07550346895da3aa86/html5/thumbnails/4.jpg)
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
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How IAA works
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Experiments
• What doe these prove?
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• Page 160 has the final lot of experiments explaining the action of IAA
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geotropism