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Master Thesis

Restriction hydrique et débourrement : étude du dialogue entre l'acide abscissique et les sucres

Abstract : Water deficit is one the most important threat for wordwilde crops. Rosebush reacts to water restriction by keeping its buds along the stem into dormancy. Interestingly, susbtrat rehydration causes a strong stimulation of bud burst. We aimed to highlight possible differences between the dormancy caused by water limitation, in regard to the dormancy caused by apical dominance. Our study focuses on the role of the cross-talk between abscisic acid and carbohydrates within bud outgrowth regulation. We showed that abscisic acid is capable alone to prevent bud burst of nodes cultivated in-vitro, and that sucrose is able to antagonism this inhibition. We also pointed the fact that this antoganism does not require sucrose metabolisation, arguing for a signal role of sucrose. Thanks to moleculare analysis and upcoming biochemical and hormonal dosages in stem and bud, we propose new hypothesis for future investigations, questionning the involvment of PIN1 proteins in the water restriction induced dormancy.
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Master Thesis
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Submitted on : Thursday, January 16, 2014 - 4:42:14 PM
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  • HAL Id : dumas-00932316, version 1



Mathieu Caradeuc. Restriction hydrique et débourrement : étude du dialogue entre l'acide abscissique et les sucres. Sciences agricoles. 2013. ⟨dumas-00932316⟩



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