Lecture+5-Auxin+_+plant+development

Lecture+5-Auxin+_+plant+development - Auxin Plant Growth...

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9/14/2011 1 When achenes are removed fruit fails to grow Shoots always grow Towards light Roots always grow towards gravity Auxin & Plant Growth Auxin regulates many plant growth and developmental processes apical dominance phototropism gravitropism root initiation vascular differentiation fruit development embryo development lateral root development At cellular level auxin regulates Cell division Cell expansion Cell differentiation
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9/14/2011 2 The Power of Movement in Plants (1880), p. 474 Charles & Francis Darwin (1880) Kogal (1934) 19.1 Summary of early experiments in auxin research (Part 1) 19.1 Summary of early experiments in auxin research (Part 2) Growth promoting substance is a chemical
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9/14/2011 3 Indole acetic acid (IAA) is the major natural auxin found in plants. CH 2 - COOH IAA N CH 2 - COOH 4 Cl-IAA N CH 2 - CH2 - CH2 - COOH IBA N Cl Other natural auxins CH 2 - COOH 1- NAA O - CH 2 - COOH Cl Cl 2,4 - D There are many synthetic auxins that are being used in agriculture Picloram Auxin homeostasis Trytophan dependent Tryptophan independent Active Auxin Transport Breakdown IAA-Conjugates Indole-3-caboxilic IAA-Asp acid
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