Elevated atmospheric [ CO 2 ] stimulates sugar accumulation and cellulose degradation rates of rice straw
In: GCB Bioenergy, Jg. 8 (2015), Heft 3, S. 579-587
academicJournal
Zugriff:
Rice straw can serve as potential material for bioenergy production. However, the quantitative effects of increasing atmospheric carbon dioxide concentration [ CO 2 ] 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 [ CO 2 ], respectively, were grown with and without additional CO 2 at China free‐air carbon dioxide enrichment ( FACE ) platform. Qualitative and quantitative measurements in response to [ CO 2 ] 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 [ CO 2 ] 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 [ CO 2 ], respectively. These findings, while preliminary, suggest that rice straw quality and potential biofuel utilization may improve as a function of rising [ CO 2 ].
Titel: |
Elevated atmospheric [ CO 2 ] stimulates sugar accumulation and cellulose degradation rates of rice straw
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Autor/in / Beteiligte Person: | Zhu, Chunwu ; Xu, Xi ; Wang, Dan ; Zhu, Jianguo ; Liu, Gang ; Seneweera, Saman ; National Natural Science Foundation of China ; Natural Science Foundation of Jiangsu Province |
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Zeitschrift: | GCB Bioenergy, Jg. 8 (2015), Heft 3, S. 579-587 |
Veröffentlichung: | Wiley, 2015 |
Medientyp: | academicJournal |
ISSN: | 1757-1693 |
DOI: | 10.1111/gcbb.12277 |
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