Lecture+7-Ethylene+_+Plant+Growth

Lecture+7-Ethylene+_+Plant+Growth - 9/21/2011 Ethylene...

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9/21/2011 1 Ethylene & Plant Growth Physiological roles of Ethylene Some of many 1) Fruit ripening / senescence 2) Epinasty 3) Regulate stem elongation 4) Root hair formation 5) Promote seed germination Biosynthesis of Ethylene Methionine S-Adenosyl-L-methionine (SAM) γ -Aminocyclopropane-1- carboxylic acid (ACC) Ethylene (H 2 C=CH 2 ) ACC synthase ACC oxidase SAM synthase
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9/21/2011 2 22.1 Ethylene biosynthetic pathway and the Yang cycle 22.5(A) Some physiological effects of ethylene on plant tissue (Part 1) When dark-grown seedlings are exposed to ethylene, they exhibit triple response 1) Inhibition of stem elongation 2) Radial swelling 3) Exaggeration of the hook (horizontal growth of the stem) 22.5(B) Some physiological effects of ethylene on plant tissue (Part 2) When plants are exposed to high level of ethylene leaves are curved toward the stem. This is generally a characteristic in flooded plants
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3 22.6 Changes in the amounts of ACC in xylem sap In flooded plants ACC is produced in roots and are transported to the shoot where it is converted to ethylene. 22.5(D) Some physiological effects of ethylene on plant tissue (Part 4) Ethylene induces root hair formation 22.5(C) Some physiological effects of ethylene on plant tissue (Part 3) Senescence of flowers and leaves is promoted by ethylene. Here
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Lecture+7-Ethylene+_+Plant+Growth - 9/21/2011 Ethylene...

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