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《Chinese Agricultural Science Bulletin》 2005-05
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Studies on Roots and Leaves Characteristics of Different Populations under System of Rice Intensification after Flowering Stage in Hybrid Rice

Zeng Xiang1, Zhang Yuzhu1, Tu Naimei2, Xiao Guoying3, Zhou Lijun1, Xie Jianhong1 (1Hunan Rice Research Institute, Changsha 410125; 2Hunan Agriculture university, Changsha 410125; 3Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125)  
The root and photosynthesis physiological characteristics of different populations of two hybrid rice Honglianyou 6 and Liangyou 1193 after flowering stage under SRI were studied. Results showed that root density was higher in small population than those of lager population, but converse to the root activity. The chlorophyll contents of flag leaf were not different at flowering stage, but which was significantly higher than that of in low yield population, so the range of reduction per days was small in high yield population. The net photosynthesis rate of flag leaf in high yield population also was significantly higher than that of low yield population in reproductive stage. The yield superiority might result from its enhancement of physical activity of plant favorable to the grain development in reproductive stage
【Key Words】: Rice SRI Population Roots Photosynthesis rate
【Fund】: 农业部农业结构调整重大研究专项(2003-01-03B);; 国家“十五”重大科技攻关项目“国家粮食丰产科技工程”(2004BA520A01); 中国科学院创新工程方向项目(KSCX2-1-01-2)
【CateGory Index】: S511
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