Lecture24 - Salicyclic acid as the mobile signal in plant...

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Salicyclic acid as the mobile signal in plant defense
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Jasmonic Acid
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Inhibition of branching by strigolactone
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istory of Brassinosteroid Research 1970, Researchers at the US Department of Agriculture showed that organic extracts ( BRASSIN ) of Brassica napus pollen strongly stimulated cell elongation and division 1979, The structure of the active component of the BRASSIN was characterize and found to be a 28 carbon steroid, given the name BRASSINOLIDE . Many chemically related compounds have been identified in a wide range of plant species, and are named BRASSINOSTEROIDS . Chemically synthesized BRASSINOSTEROIDS were used for physiological studies and agricultural application.
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Many animal steroid analogs were found in plants, but only one special class of steroids ( BRASSINOSTEROIDS ) are widely distributed in the plant kingdom 3 structural features critical for biological activity Hydroxylated side chain Lactone B-ring Two cis-hydroxyl groups on A-ring
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Physiological Effects of BRASSINOSTEROIDS Physiological Effects of BRASSINOSTEROIDS 1. Promote stem elongation 1. Promote stem elongation 2. Stimulate asymmetric growth (via auxin?) 2. Stimulate asymmetric growth (via auxin?) 3. Activates a membrane-bound ATPase 3. Activates a membrane-bound ATPase 4. Effects on development 4. Effects on development A. promote seed germination A. promote seed germination B. stimulate vascular differentiation B. stimulate vascular differentiation C. enhance partitioning of photoassimilates from source C. enhance partitioning of photoassimilates from source to sink to sink D. increase pollen tube elongation D. increase pollen tube elongation E. accelerate senescence E. accelerate senescence
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Useful Agricultural Application Increase Crop Yield A. Enhance seed germination
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This note was uploaded on 11/30/2011 for the course BIOLOGY 321 taught by Professor Min during the Winter '11 term at University of Michigan.

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Lecture24 - Salicyclic acid as the mobile signal in plant...

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