37 - hormones and growth - arabidopsis genetics

37 - hormones and growth - arabidopsis genetics - Hormones...

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Unformatted text preview: Hormones and Growth in Plants (especially Arabidopsis) Plant vs. Animal Hormones Animal hormones Peptides/proteins/small organic molecules Synthesized in specialized glands Often affect distant targets (often transported in the circulatory system) Specialized effects Regulated by the central nervous system Plant hormones Small organic molecules (not usually peptides) Synthesized throughout the plant Affect local cells and tissues, or can be transported through the vascular system Wide-ranging effects Decentralized regulation Principle Plant Hormones Auxin (IAA indole acetic acid, NAA) Cytokinin (purines, BA) Gibberillins (GA) Abscisic acid (ABA) Ethylene Brassinosteroids Two types of growth responses that well consider Tropic responses Primarily phototropic, i.e., growth that is oriented with respect to light (usually toward it) Root/shoot ratio responses Control of the relative growth of roots and shoots in a plant Extremely important to ensure the plant does not have too much or too little of either parts Too much shoot can lead to inadequate water...
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37 - hormones and growth - arabidopsis genetics - Hormones...

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