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《China Rice》 2016-01
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Effects of Drought and Re-watering on Rice Physiological and Biochemical Indexes of Leaves and Grain Yield at Booting Stage

CHEN Liang;WANG Benfu;JIANG Yuanyuan;CAO Cougui;LI Ping;College of Plant Science and Technology, Huazhong Agricultural University;Hubei Collaborative Innovation Center for Grain Industry, Yangtze University;  
Although the study on drought damage mechanism of leaf cells and physiological and biochemical indexes of rice is rich and comprehensive, the study on the subsequent physiological changes after re-watering is still less. In this study, two rice varieties with different drought resistance ability, Zhonghan3(resistant)and Huanghuazhan(non-resistant), were used. Four treatments including flooding(CK), low drought stress(LD), moderate drought stress(MD) and high drought stress(HD) were implemented at booting stage. The effects of drought stress on rice leaf physiological and biochemical traits(photosynthesis, GS, SPAD, antioxidant enzyme activity, and MDA)and grain yield were studied. The main results are as follows : 1)In MD and HD treatments, Pn of rice leaves decreased by 12.9%~43.9% which mainly related to Gs, while LD treatment have no significant difference in physiological and biochem-ical traits of leaf compared to CK. 2)After re-watering, all indices of leaf physiology and biochemistry for Zhonghan 3 could return to normal status under all treatments, whereas in Huanghuazhan, the target traits under LD and MD treatments could return to normal,and the HD influence could not recover after re-watering. 3)Drought stress made grain yield reduced by 14.3%~47.9% which mainly caused by the significant reduction of effective panicles and seed setting rate.
【Fund】: 高等学校博士学科点专项科研基金(20130146120033);; 中央高校基本科研业务费专项资金资助项目(2014QC026)
【CateGory Index】: S511
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