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Identification des critères du grain de blé (Triticum aestivum L.) favorables à la production de bioéthanol par l'étude d'un ensemble de cultivars et par l'analyse protéomique de lignées isogéniques waxy

Abstract : To identify selection criteria for wheat (T. aestivum L.) used for bioethanol production, our objectives were (1) to identify the physicochemical grain characteristics associated with glucose and ethanol yields and (2) using a proteomic approach, to study the impact on sugar and starch metabolism of genetic variants that influence the quantity of amylose. The analysis of 30 wheat varieties grown in a 3-year multi-local field trial underlined the importance of protein content, grain hardness and starch granule size distribution for glucose and ethanol yields. A minor effect of the allelic composition of the storage proteins and of viscosity on the transformation of starch in fermentable sugars was also revealed. Eight waxy isogenic lines of three French varieties were grown in a multi-local field trial. The amylose-free lines produced less glucose and ethanol than normal varieties. Proteomic analyses of endosperm proteins (albumins, globulins and amphiphilic proteins) and of proteins associated with starch granules in mature grains of isogenic lines of the Tremie variety revealed : (1) a relation between the specific volume of the GBSS and amylose quantity and (2) a modification of the expression of enzymes involved in starch and sugar metabolism (Susy, AGPase, Fructose biphosphate aldolase) and also in stress and defence proteins (serpins and HSP). These observations suggest incomplete grain development in the line without amylose.
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Clément Debiton. Identification des critères du grain de blé (Triticum aestivum L.) favorables à la production de bioéthanol par l'étude d'un ensemble de cultivars et par l'analyse protéomique de lignées isogéniques waxy. Sciences agricoles. Université Blaise Pascal - Clermont-Ferrand II, 2010. Français. ⟨NNT : 2010CLF22067⟩. ⟨tel-00625530⟩

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