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Plant respones to internal & external signals

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Plant responses to internal & external signals Page 1 of 8 Plant responses to internal & external signals Readings: Chapter 39 Self quiz: Questions 2, 4, 5, 6, 7, & 9 How do plants receive signals? 1. Signal-transduction pathway has 3 main parts (a) The signal (stimulus) is recognized by a receptor (b) Transduction amplifies & directs the signal (c) There is a specific response Plant hormones 1. Definition (from Hopkins & Hüner, 2008) “Naturally occurring organic molecules that at low concentrations exert a profound influence on physiological processes.” 2. Affect all aspects of growth & development (see Table 39.1) (a) Stimulates growth & fruit development (b) Inhibits growth & promotes dormancy (c) One hormone has many effects (d) Several hormones can affect one process
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Plant responses to internal & external signals Page 2 of 8 3. Auxin is indoloacidic acid (IAA) 3.1 It is produced in meristematic regions & actively growing regions (a) It moves in one direction (b) Polar transport proteins 3.2 Major functions of auxin (a) Stem elongation (b)
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