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《Journal of Agro-Environment Science》 2012-04
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Response of Rice and Weedy Rice Subjected to Cadmium Stress:A Comparative Study

WANG Xin,ZHOU Shou-biao*,CHENG Long-ling,WU Xiao-yan(Key Laboratory of Biological Resources Conservation and Utilization,College of Life Sciences,Anhui Normal University,Wuhu 241000,China)  
The effects of Cd2+ on growth,chlorophyll content,MDA content,proline content,relative electric conductivity and activities of anti-oxidative enzymes in rice and weedy rice were examined hydroponically.The results suggested that,(1)apparent damage of aerial parts of rice and weedy rice exposed to Cd enhanced with increasing Cd2+ concentration.(2)Contents of chlorophyll a,chlorophyll b and total chlorophyll in leaves of rice and weedy rice increased at Cd2+ concentration below 0.5 mg·L-1,while their contents decreased at concentration above 0.5 mg·L-1.Carotenoid content decreased at Cd2+ concentration below 0.5 mg·L-1,but attenuated later on.The Carotenoid content increased again at Cd2+ concentration above 1.0 mg·L-1.(3)Activities of SOD,POD and CAT in rice exposed to Cd2+ increased when Cd2+ concentration was below 1 mg·L-1,but decreased when Cd2+ concentration was above 1 mg·L-1.Activities of SOD and CAT in weedy rice increased when Cd2+ concentration was below 2 mg·L-1,but decreased when Cd2+ concentration was above 2 mg·L-1.POD activity in weedy rice increased with increasing Cd2+ concentration.(4)Subjected to Cd2+ treatment,MDA content in both rice and weedy rice increased,while relative electric conductivity and proline content significantly increased,and the amplitude increased in rice was higher than those in weedy rice,suggesting that rather severe membrane lipid peroxidation has been occurred in rice.Taken together,rice was more sensitive to Cd2+ stress than weedy rice in terms of susceptibility,while with reference to resistance,weedy rice was more resistant to Cd2+ stress than rice.
【Fund】: 转基因生物新品种培育科技重大专项“转基因水稻向杂草稻基因漂流的风险评价、预防及其后果的控制”(No.2009ZX08012-020B);; 安徽省高校生物环境和生态安全重点实验室(2004003)专项基金资助
【CateGory Index】: X173;S511
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