Elevated atmospheric [CO2] stimulates sugar accumulation and cellulose degradation rates of rice straw
Article
Article Title | Elevated atmospheric [CO2] stimulates sugar accumulation and cellulose degradation rates of rice straw |
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ERA Journal ID | 200542 |
Article Category | Article |
Authors | Zhu, Chunwa (Author), Xu, Xi (Author), Wang, Dan (Author), Zhu, Jianguo (Author), Liu, Gang (Author) and Seneweera, Saman (Author) |
Journal Title | GCB Bioenergy |
Journal Citation | 8 (3), pp. 579-587 |
Number of Pages | 9 |
Year | 2016 |
Publisher | John Wiley & Sons |
Place of Publication | United Kingdom |
ISSN | 1757-1693 |
1757-1707 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/gcbb.12277 |
Web Address (URL) | http://onlinelibrary.wiley.com/doi/10.1111/gcbb.12277/full |
Abstract | Rice straw can serve as potential material for bioenergy production. However, the quantitative effects of increasing atmospheric carbon dioxide concentration [CO2] on rice straw quality and the resulting consequences for bioenergy utilization are largely unknown. In this study, two rice varieties, WYJ and LY, that have been shown previously to have a weak and strong stimulatory response to rising [CO2], respectively, were grown with and without additional CO2 at China free-air carbon dioxide enrichment (FACE) platform. Qualitative and quantitative measurements in response to [CO2] included straw biomass (including leaf, sheath, and stem), the concentration of nonstructural and structural carbohydrates, the syringyl-to-guaiacyl (S/G) ratio of lignin, glucose and xylose release from structural carbohydrate, total sugar release by enzymatic saccharification, and sugar yield and the ratio of cellulose and hemicellulose degradation. Elevated [CO2] significantly increased straw biomass and nonstructural carbohydrate contents while enhancing the degraded ratio of structural carbohydrates as indicated by the decreased lignin content and increased S/G ratio. Overall, total sugar yield (g m-2) in rice straw significantly increased by 27.1 and 57% for WYJ and LY at elevated [CO2], respectively. These findings, while preliminary, suggest that rice straw quality and potential biofuel utilization may improve as a function of rising [CO2]. |
Keywords | biofuel; elevated [CO2]; rice; saccharification; straw; sugar release |
ANZSRC Field of Research 2020 | 410203. Ecosystem function |
300404. Crop and pasture biochemistry and physiology | |
410102. Ecological impacts of climate change and ecological adaptation | |
Byline Affiliations | Chinese Academy of Sciences, China |
Nanjing University of Information Science and Technology, China | |
Centre for Systems Biology | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q35w6/elevated-atmospheric-co2-stimulates-sugar-accumulation-and-cellulose-degradation-rates-of-rice-straw
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