Journal
BIORESOURCE TECHNOLOGY
Volume 167, Issue -, Pages 14-23Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.04.086
Keywords
Sweet sorghum; Soluble sugar; Dry bagasse; Plant cell walls; Biomass digestibility
Funding
- 111 Project of Ministry of Education of China [B08032]
- Transgenic Plant and Animal Project of Ministry of Agriculture of China [2009ZX08009-119B]
- 973 Pre-project of Ministry of Science and Technology of China [2010CB134401]
- HZAU Changjiang Scholar Promoting Project [52204-07022]
- Fundamental Research Funds for the Central Universities Project [2013QC042]
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Sweet sorghum has been regarded as a typical species for rich soluble-sugar and high lignocellulose residues, but their effects on biomass digestibility remain unclear. In this study, we examined total 63 representative sweet sorghum accessions that displayed a varied sugar level at stalk and diverse cell wall composition at bagasse. Correlative analysis showed that both soluble-sugar and dry-bagasse could not significantly affect lignocellulose saccharification under chemical pretreatments. Comparative analyses of five typical pairs of samples indicated that DP of crystalline cellulose and arabinose substitution degree of non-KOH-extractable hemicelluloses distinctively affected lignocellulose crystallinity for high biomass digestibility. By comparison, lignin could not alter lignocellulose crystallinity, but the KOH-extractable G-monomer predominately determined lignin negative impacts on biomass digestions, and the G-levels released from pretreatments significantly inhibited yeast fermentation. The results also suggested potential genetic approaches for enhancing soluble-sugar level and lignocellulose digestibility and reducing ethanol conversion inhibition in sweet sorghum. (C) 2014 Published by Elsevier Ltd.
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