Hormones - PLANT HORMONES I Plant growth development influenced by growthregulating substances Hormones A Hormone is substance synthesized in one

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PLANT HORMONES I. Plant growth & development influenced by growth- regulating substances - Hormones. A.Hormone is substance synthesized in one place and has an influence somewhere else. 1. Plant hormones are not synthesized in specialized organs. 2. Have numerous effects 3. Effect each other II. Five plant hormones: A.Auxin B. Gibbererellins C. Cytokinins D.Ethylene E. Abscisic Acid III. AUXIN A.Discovery 1. Darwin's study of phototropism (1870's) 2. Went identified auxin in 1926 3. Indole-acetic acid (IAA) B. Synthesis 1
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flowers, fruits, pollen 2. 2,4-D is synthetic auxin used as herbicide and as growth control substance. C. Transport 1. Through parenchyma cells of cortex & pith, living vascular tissue. 2. Polar movement in shoots and roots. 3. Active transport D.Effects of Auxin 1. Cellular elongation in grass seedlings and herbs a. Increases the plasticity of cell walls 2. Cellular elongation also requires protein synthesis a. IAA stimulates production of mRNA E. Apical Dominance 1. Terminal bud produces IAA 2. IAA moves to area of lateral buds and stimulates production of Ethylene. 3.
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This note was uploaded on 12/25/2011 for the course BOTANY 206 taught by Professor Wood during the Fall '09 term at Broward College.

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Hormones - PLANT HORMONES I Plant growth development influenced by growthregulating substances Hormones A Hormone is substance synthesized in one

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