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Plant hormones and Review of “P” words and Review of Animal Hormone Paris

Plant hormones and Review of “P” words and Review of Animal Hormone Paris. Chemicals that make up hormones. Plant: Gases…why? Animal: Proteins/small peptides Steroids…what is the difference about the signaling mechanism. Light can signal hormone production in plants.

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Plant hormones and Review of “P” words and Review of Animal Hormone Paris

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  1. Plant hormones and Review of “P” words and Review of Animal Hormone Paris

  2. Chemicals that make up hormones • Plant: • Gases…why? • Animal: • Proteins/small peptides • Steroids…what is the difference about the signaling mechanism

  3. Light can signal hormone production in plants

  4. Compare to animal hormone signaling mechanisms

  5. Plant hormones to know • Gibberlins • Cytokinins • Ethylene • Abscisic acid • Auxins • As we define this in the next few pages, think about how a multiple choice question could get at your understanding. • What if a plant has too much or too little?

  6. Gibberelins • Promote stem elongation • Which plant is a mutant for gibberellic acid production?

  7. Cytokinins • Promote cell division and differentiation • Why would cytokinins suppress aging?

  8. Ethylene • Induces leaf abscission and promotes fruit ripening

  9. Abscisic acid • Inhibits leaf abscission and promotes bud and seed dormancy. • Why might these two processes be controlled by the same hormone?

  10. Auxins • Promotes plant growth and phototropism • How does this experiment show the activity of auxin?

  11. What hormones might be involved in germination? How?

  12. The terrible plant p’s • Phototropism • Photoperiodism • Photorespiration • Photosystem • Phytochrome • Just in case the college board puts many of these in a multiple choice!

  13. Tropisms=“movement” in plants • Phototropism=light • Gravitotropism=gravity • Thigmotropism=touch • What do each of these mean? What would a mutant plant look like?

  14. Photoperiodism and phytochromes • The amount of light triggers reproduction in plants (photoperiodism!). • Phytochromes are the receptors that respond to light. • Short-day plants: light receptor inhibits flowering. • Long-day plants: light receptor induces flowering.

  15. What could be an advantage of being a short-day plant?

  16. Photosystems and Photorespiration • Photosystems=light reactions=good!!! • Review: • Cyclic=which photosystem(s) and what is the key product? • Noncyclic=which photosystem(s) and what is the key product?

  17. Photorespiration • Calvin cycle gets O2…bad!!! Rubisco • Adaptations: CAM/C4 • Pep carboxylase • Temporal? • Structural? Bundle sheath

  18. How about animals! • Example of hormones from the brain controlling hormones produced at glands in the body: • TRH/TSH/T3 & T4 • FSH/LH and their targets in males and females • Two feedback loops to know: • Insulin/Glucagon • Calcitonin/PTH

  19. Group quick presentation…find one picture that best represents the hormone system • What is the gland that produces each hormone? • What are the main targets of each hormone? • Are they steriod or protein hormones? • How does feedback work for the system you studied?

  20. RAAS and ADH • Both control water balance • ADH: • Produced in the hypothalamus • Acts on the nephron to increase reuptake of water back into the body • Raises blood volume. • RAAS: • Kidney and adrenal glands • Contstricts arteries to increase blood pressure and increases water reabsorption

  21. Positive Feedback • Oxytocin=labor and milk production in placentals • Why is positive feedback necessary here?

  22. Where are hormones from? • The ones from organs general have the organs in the name or we’ve talked about them! • Most of the rest come from the anterior pituitary!!!

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