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BIO172W08Lec31CT - Biology 172 Lecture 31 Chemical Signals...

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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
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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
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Example of Hormone Action: Phototropism
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Major Types of Plant Hormones Cell elongation Cell elongation Cell division
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Major Types of Plant Hormones Stress hormone Gas
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Evidence for the Hormone Hypothesis of Phototropism
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Auxin is produced in the tip of the shoot but why is it asymmetrically distributed?
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