Biomass digestibility is predominantly affected by three factors of wall polymer features distinctive in wheat accessions and rice mutants

文献类型: 外文期刊

第一作者: Wu, Zhiliang

作者: Wu, Zhiliang;Zhang, Mingliang;Wang, Lingqiang;Tu, Yuanyuan;Zhang, Jing;Xie, Guosheng;Zou, Weihua;Li, Fengcheng;Guo, Kai;Li, Qing;Peng, Liangcai;Wu, Zhiliang;Zhang, Mingliang;Wang, Lingqiang;Tu, Yuanyuan;Zhang, Jing;Xie, Guosheng;Zou, Weihua;Li, Fengcheng;Guo, Kai;Li, Qing;Peng, Liangcai;Wu, Zhiliang;Zhang, Mingliang;Wang, Lingqiang;Tu, Yuanyuan;Zhang, Jing;Xie, Guosheng;Zou, Weihua;Li, Fengcheng;Peng, Liangcai;Guo, Kai;Li, Qing;Gao, Chunbao

作者机构:

关键词: Cell wall;Cellulose crystallinity;Arabinose substitution degree;p-coumaryl alcohol proportion;Biomass digestibility;Chemical pretreatment;Wheat;Rice

期刊名称:BIOTECHNOLOGY FOR BIOFUELS ( 影响因子:6.04; 五年影响因子:6.485 )

ISSN: 1754-6834

年卷期: 2013 年 6 卷

页码:

收录情况: SCI

摘要: Background: Wheat and rice are important food crops with enormous biomass residues for biofuels. However, lignocellulosic recalcitrance becomes a crucial factor on biomass process. Plant cell walls greatly determine biomass recalcitrance, thus it is essential to identify their key factors on lignocellulose saccharification. Despite it has been reported about cell wall factors on biomass digestions, little is known in wheat and rice. In this study, we analyzed nine typical pairs of wheat and rice samples that exhibited distinct cell wall compositions, and identified three major factors of wall polymer features that affected biomass digestibility. Results: Based on cell wall compositions, ten wheat accessions and three rice mutants were classified into three distinct groups each with three typical pairs. In terms of group I that displayed single wall polymer alternations in wheat, we found that three wall polymer levels (cellulose, hemicelluloses and lignin) each had a negative effect on biomass digestibility at similar rates under pretreatments of NaOH and H2SO4 with three concentrations. However, analysis of six pairs of wheat and rice samples in groups II and III that each exhibited a similar cell wall composition, indicated that three wall polymer levels were not the major factors on biomass saccharification. Furthermore, in-depth detection of the wall polymer features distinctive in rice mutants, demonstrated that biomass digestibility was remarkably affected either negatively by cellulose crystallinity (CrI) of raw biomass materials, or positively by both Ara substitution degree of non-KOH-extractable hemicelluloses (reverse Xyl/Ara) and p-coumaryl alcohol relative proportion of KOH-extractable lignin (H/G). Correlation analysis indicated that Ara substitution degree and H/G ratio negatively affected cellulose crystallinity for high biomass enzymatic digestion. It was also suggested to determine whether Ara and H monomer have an interlinking with cellulose chains in the future. Conclusions: Using nine typical pairs of wheat and rice samples having distinct cell wall compositions and wide biomass saccharification, Ara substitution degree and monolignin H proportion have been revealed to be the dominant factors positively determining biomass digestibility upon various chemical pretreatments. The results demonstrated the potential of genetic modification of plant cell walls for high biomass saccharification in bioenergy crops.

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