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《Chinese Journal of Rice Science》 2013-01
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Effects of Rewatering after Drought at Heading Date on Seed Setting and Some Physiological Indexes in Early Rice Varieties with Different Yields

CHEN Xiao-rong,LIU Ling-yan,YAN Chong-hu,ZHONG Lei,ZHU Chang-lan,PENG Xiao-song,HE Xiao-peng,FU Jun-ru,OUYANG Lin-juan,HE Hao-hua(College of Agronomy,Jiangxi Agricultural University/Key Laboratory of Crop Physiology,Ecology and Genetic Breeding of Jiangxi Province/Key Laboratory of Crop Physiology,Ecology,Genetics and Breeding,Ministry of Education,Nanchang 330045,China)  
In order to prove up yield compensatory effect and the physiological mechanism of double-season early rice under the treatment of rewatering after drought 7 days at heading,the seed setting rate and yield,contents of osmolytes,malondialdehyde(MDA),endogenous hormones,and protective enzyme activity in flag leaf were investigated with Ganxin 203 and Ganxin 206 as material.The results were as follows: the seed-setting rate,1000-grain weight and yield per plant of the two varieties declined to various extent under the treatment of rewatering after drought.Among them,seed setting rate and yield per plant differed significatly,demonstrating a lack of yield compensatory effect under the treatment of rewatering after 7 days of drought at heading.The contents of soluble sugar(SS),free proline(Pro),MDA,superoxide dismutase(SOD),and catalase(CAT) activity in flag leaf under the treatment for the two varieties were significantly higher than the CK and the gap peaked 0 day after rewatering(DAR).The above-mentioned indexes all decreased markedly after rewatering with difference between the treatment and the CK till 12 DAR.As a whole,under the flooded conditions at heading,contents of endogenous hormones of Indole-3-acetic acid(IAA) and gibberellin A3(GA3) in flag leaf increased,while abscisci alid(ABA) and zeatin riboside(ZR) contents declined along with the growth course.The ABA,IAA and ZR contents in the flag leaf of the two varieties under the treatment continually increased,while GA3 content decreased at first then increased.The treatment of drought after heading would promote the senescence resistant mechanism inner the rice plant,and rewatering would activate the growth promotion factors and inhibited the growth restrain factors,but the effects were quite limited and not evidently related with the yield performance.
【Fund】: 国家自然科学基金资助项目(30860136);; 江西省科技支撑计划资助项目(2010BNA03600);; 江西省教育厅项目(GJJ10423);; 江西省领军人才培养计划资助项目
【CateGory Index】: S511.31
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