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《Journal of Northeast Agricultural University》 2009-03
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Impacts of CO_2 enrichment and temperature increasing on grain quality of rice

XIE Liyong1,2, MA Zhanyun2, HAN Xue2, LIN Erda2 (1. College of Agriculture, Shenyang Agricultural University, Shenyang 110161, China; 2. Institute of Environment & Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China)  
Crop quality is resulted from both genetic traits and environment conditions. Elevated CO2 in the atmosphere could affect crops quality as a result of changing crop physiology and metabolism. Meanwhile, temperature will increase with CO2 enrichment. This experiment was conducted to reveal the impacts of CO2 enrichment and temperature rising on grain quality of rice. The results showed that with elevated CO2 in the atmosphere and temperature rising, milling qualities and appearance qualities of rice declined; cooking and eating qualities increased in the beginning and got the maximum value approaching 500 mg·kg -1, then declined; nutritional qualities changed complexly, of which sugar contents increased, fat contents decreased, and protein contents increased at first(the maximum value on 500 mg·kg -1), then declined. In sum, CO2 enrichment and temperature rising had more negative effect on grain quality of rice than positive effect, especially on milling and appearance qualities. But the results differences with treatments from 450 mg·kg -1 to 650 mg·kg -1 were not significant. The study indicates that CO2 enrichment and temperature rising change C/N metabolize process and physical components and chemical compounds of grain. There is a potential to improve grain quality of rice as taking adaptive measures according to the effect mechanism of elevated CO2 and temperature rising on rice.
【Fund】: 国家科技支撑计划“十一五”重大项目(2007BAC03A06);; 中-澳国际合作项目(00xx-0506-Norton);; 中国博士后科学基金(20060390547)
【CateGory Index】: S511
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