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Identification and Evaluation on the Drought Resistance of Yields and their Traits in New Hybrid Rice Combinations

Cheng Jianfeng~1 Liu Yibai~1 Panx Xiaoyun~1 et al(1 College of Agronomy,Jiangxi Agricultural University,Nanchang,330045;Agriculture Bureau of Yichun city,Jiangxi Province,336000)  
Thirty new hybrid rice combinations were selected as experiment material and were planted in the dry land and wet land in this experiment,Yields and their traits(effective panicle per plant,total grain number,no-filled grains,seed setting ratio,1000-grain weight,grain yield per plant) in new hybrid rice combinations,single and comprehensive identification and evaluation of the new hybrid rice combinations were carried with the fuzzy subordinate function value of drought response percentage(DRP) in yield traits.The results showed that coefficient of variation(C.V.) in the yields and their traits of new hybrid rice combinations were different in the wetland and dry land,the maximum with no-filled grains and the minimum with the 1000-grain weight.C.V.of no-filled grains in the wetland was larger than that in the dry land,C.V.of the others in the dry land were larger than those in the wetland.DRP of yields and their traits in different new hybrid rice combinations were different;Regarded them as the criterion of classification and evaluation,middle drought resistances of hybrid rice combinations were most,high and low were few.Fuzzy subordinate function value of DRP and comprehensive drought resistance of yields and their traits in different new hybrid rice combinations were different;Regarded them as the criterion of classification and evaluation,low,middle and high drought resistances of hybrid rice combinations were slightly same.Markedly significant correlation between the DRP of seed setting ratio and drought-resistant coefficient were positive.Discrimination percentage of types that were classified by seed setting ratio was the highest with 70%,so seed setting ratio was the indirect and dependable index as the identification and evaluation on drought resistance of hybrid rice.
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