【摘 要】
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Dear Editor,Xylan polysaccharides constitute the major non-cellulosic components in secondary cell walls of dicots and in both primary and secondary cell walls
【机 构】
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Department of Plant Pathology and The Genome Center, University of California, Davis, CA 95616, USA
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Dear Editor,Xylan polysaccharides constitute the major non-cellulosic components in secondary cell walls of dicots and in both primary and secondary cell walls of grasses (Scheller and Ulvskov,2010).Xylan is composed of a linear backbone of 13(1-4)-linked xylose (Xyl).In grasses,the xylan backbone is substituted with O3-1inked and O2-1inked arabinose residues and,to a lesser extent,α(1-3)-Iinked glucuronic acid residues.A unique feature of grass xylans is the presence of hydroxycinnamate esters (ferulic and p-coumaric acid residues)attached to C5 of some of the arabinosyl residues (Carpita,1996;Vogel,2008;Scheller and Ulvskov,2010).Xylan contributes to the recalcitrance of plant cell walls to enzymatic degradation probably through direct interaction with cellulose microfibrils and also through formation of ferulate cross-links (liyama et al.,1994;Yin et al.,2011).
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