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| Synthesis and distribution of organic substances in different types of rice during filling stage under elevated atmospheric CO2 condition |
| Received:December 04, 2015 |
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| KeyWord:FACE;japonica;indica;organic substances |
| Author Name | Affiliation | E-mail | | LI Chun-hua | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Graduate School of Chinese Academy of Sciences, Beijing 100080, China | | | ZENG Qing | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHU Jian-guo | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | jgzhu@issas.ac.cn | | LIU Gang | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| Elevated atmospheric CO2 concentration([CO2]) may enhance carbonhydrate content but decrease protein concentrations in plants. Here a field experiment was conducted to examine the effects of CO2 enrichment on synthesis and distribution of organic substances in two different types of rice, Wuyunjing 21(WYJ21, Japonica) and Yangdao6(YD6, Indica) under Free-air CO2 enrichment(FACE) conditions in China. Compared with the control, amylose and amylopectin content in grains of WYJ21 was increased slightly under CO2 enrichment, whereas the amylase content in YD6 grains significantly increased by 8.9%. Meanwhile, the β-amylose activity in grains of YD6 under FACE was significantly decreased by 28.1% at post-filling stage, while no significant changes in α-amylose and β-amylose were observed in WYJ21. The sucrose content in grains was 11.5% higher at milk stage in WYJ21, but 14.4% lower at ripening stage in YD6 than the control check, respectively. Meanwhile, the sucrose content in stems of WYJ21 and YD6 under FACE was significantly reduced at ripening stage and milk stage, respectively. In addition, the sucrose synthetase(SS) activity of stems in both rice types was significantly increased at post-filling stage. FACE increased the sucrose phosphate synthase(SPS) activity of stems in WYJ21 at pre-filling stage and increased that of YD6 at post-filling stage. On the other hand, FACE decreased the protein content in stems of WYJ21 by 38.5% at ripening stage and by 33.9% and 60.5% in YD6 at ripening stage and full ripe stage, respectively. Statistical analysis showed that CO2, stages and cultivars significantly affected the sucrose content and SS and SPS activities in stems. CO2, stage, cultivar and/or their interactions significantly affect the amylose and amylopectin content, α-amylose and β-amylose activity, and protein content. All these results demonstrated that different responses were detected in different types of rice to elevated [CO2] during the filling stage. Rice YD6 had greater CO2 responses to some extent than WYJ21. |
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