BIO172W08Lec31CT - Biology 172 L e c t u r e 3 1 - - C h e...

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1 Lecture 31-- Chemical Signals: Plants March 31, 2008 Today s Outline 1. Overview of plant hormones 2. Auxin - Phototropism - Apical dominance 3. Cytokinins 4. Gibberellins & ABA - Germination & growth - Dormancy - Drought stress Announcements Exam 3 Multiple Choice Mean = 88/120 (73.3%) Short Answer (not complete) Mean = 22/30 (73.3%) Biology 172 Summary of Plant Hormones • Hormones link receptors that receive stimuli from the environment to a response by plants Hormones = organic compounds produced in small amounts in one part of the plant and transported to target cells in another region where a physiological response occurs • Responses include asymmetric growth, flowering, fruit ripening, dormancy, etc. • Several hormones can affect same response and sometimes interact with each other Example of Hormone Action: Phototropism Major Types of Plant Hormones Cell elongation Cell elongation Cell division Major Types of Plant Hormones Stress hormone Gas Evidence for the Hormone Hypothesis of Phototropism
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BIO172W08Lec31CT - Biology 172 L e c t u r e 3 1 - - C h e...

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