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《Molecular Plant Breeding》 2018-10
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Evaluation of Seed Germination Vigor of Rice Cultivars Under Low Temperature or Hypoxic Condition Related with Direct Seeding Rice

Cao Wei;Wang Yan;Tan Bin;Liu Wei;Chu Li;Pan Zhaoyuan;Zhao Guangmiao;Cao Guiyuan;Zhou Yuliang;Guangdong Key Laboratory of Plant Molecular Breeding, College of Agriculture, South China Agricultural University;  
Improving seed germinability under low temperature and hypoxic conditions is an effective way to solve the full stand problem of direct seeding rice. In this study, 23 rice cultivars which had been used to construct the library of chromosome single segment substitution lines(SSSLs) in our lab were used as the material. Fifteen indexes associated with seed vigor were investigated after germination under low temperature and hypoxic conditions, and comprehensive assessments of the tested varieties were carried out by multiple comparison analysis, coefficient variation analysis, principle component analysis and correlation coefficient analysis. The results showed that the indexes of the tested rice varieties displayed a large variation, which ranged from 0.10 to0.64, and the largest value was the germination rate at 7 d under 15℃. Principal component analysis indicated that three and two principle components were extracted at low temperature and hypoxic condition, respectively, and the cumulative contribution percentage were 86.3% and 91.8%, respectively. In addition, no significant correlation was observed between the two traits. Comprehensive ranking data demonstrated that W5(Zihui 100), W22(Khazar)and W2(Amol 3) were the top three cultivars at low temperature, and W10(Nanyangzhan), W22 and W13(Jiangxisimiao) were the top three cultivars under hypoxic condition. Furthermore, according to the scatter diagram, the 23 cultivars were divided into 4 groups, including six anoxia resistance and low temperature sensitive ones, six anoxia resistance and low temperature resistance ones, seven anoxia sensitive and low temperature resistance ones and four anoxia sensitive and low temperature sensitive ones, in which W22 showed a superior performance both at low temperature and hypoxic conditions. These results could provide reference for breeding new direct seeding rice varieties.
【Fund】: 国家自然科学基金项目(31771888;31301403);; 广东省自然科学基金项目(S2013040014992;2017A030310271);; 高等学校博士学科点专项科研基金项目(20134404120012);; 华南农业大学2017年度省级大学生创新创业训练计划项目(2017-10564004)共同资助
【CateGory Index】: S511
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