lecture 2-24 plants V

lecture 2-24 plants V - Chapter 39(pp.810-813 Learning...

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Chapter 39 (pp.810-813) Plants – Environmental stresses Learning objectives • Describe the responses of plants to: - drought - flooding - salt - heat - cold • Explain how plants deter herbivores • Explain how plants defend against pathogens
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Plant responses • Two major classes of light receptors: blue-light photoreceptors and phytochromes - blue-light photoreceptors ..control hypocotyl elongation, stomatal opening, and phototropism - phytochromes ..regulate many other responses (e.g., seed germination; shade avoidance; responses to seasons, day/night length; flowering…) • Gravitropism – Positive/negative responses to gravity • Thigmotropism – growth in response to touch (occurs in vines and other climbing plants) • Mechanical stimulation – leaf movements (rapid movements in some plants) • Environmental stress: drought flood salt heat cold herbivores disease
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During drought Plants respond to water deficit by reducing transpiration (stomata close ( ABA
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This note was uploaded on 03/19/2008 for the course BIO 311D taught by Professor Reichler during the Spring '08 term at University of Texas.

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lecture 2-24 plants V - Chapter 39(pp.810-813 Learning...

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