IMPACT OF LIGNIN STRUCTURE AND CELL WALL RETICULATION ON MAIZE CELL WALL DEGRADABILITY
Grass cell walls are complex molecular assemblies involving polysaccharidic (cellulose and hemicelluloses) and phenolic (lignins and phydroxycinnamic acids) components. Lignin content is recognized as the first limiting factor negatively correlated with cell wall degradability. However, it is not possible to construct plants with drastically reduced lignin contents since a minimum of lignification is needed to ensure plant posture, avoid lodging and protect the plant against parasitic attack. For this reason, we selected 8 maize recombinant inbred lines to assess both the impact of lignin structure and organization, and the impact of cell wall reticulation by p-hydroxycinnamic acids on cell wall degradability independently of the main lignin content factor. These recombinant lines and there parents were analyzed for cell wall residue content, esterified and etherified p-hydroxycinnamic acids content, lignin content and structure and in vitro degradability. Amongst these biochemical parameters, lignin structure and esterified pcoumaric acid content showed high significant correlation with in vitro cell wall degradability (r = -0.82 and r = -0.72 respectively). A multiple regression analysis was also carried out. More than 80％ of the observed cell wall degradability variations within these ten lines could be explained by a regression model which includes two main explanatory factors: lignin content in the cell wall and a composite variate which estimated the proportion of S lignin units esterified by p-coumaric acid. In this study, we thus highlighted biochemical factors involved in cell wall degradability limitation and defined potential parameters to select in order to improve cell wall degradability and lignocelluloses valorization.
lignin content lignin structure esterified p-coumaric acid ferulic acid in vitro cell wall degradability
Yu Zhang Tanya Culhaoglu Brigitte Pollet Corinne Melin Dominique enoue Yves Barri(e)re Stephanie Baumberger alerie Mechin
Institut Jean-Pierre Bourgin, UMR 1318 INRA/AgroParisTech, P(o)leSCSM, 78000 Versailles,France Unit(e) de Recherche Pluridisciplinaire Prairies et Plantes Fourrag(e)res, 86600 Lusisnan, France
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
942-948
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）