| Study of identification, evaluation and prediction on the drought resistance of new indicia hybrid rice combinations |
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| DOI：10.7606/j.issn.1000-7601.2018.02.24 |
| Key Words: indicia hybrid rice drought resistance evaluation comprehensive evaluation D value prediction |
| Author Name | Affiliation | | ZHANG Hong | College agronomy of Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Institute of Plant Protection, Sichuan Academy of Agricultural Sciences/Key Laboratory of Integrated Pest Management on Crops in Southwest, Ministry of Agriculture, Chengdu, Sichuan 610066, China | | ZHU Cong-hua | Institute of Plant Protection, Sichuan Academy of Agricultural Sciences/Key Laboratory of Integrated Pest Management on Crops in Southwest, Ministry of Agriculture, Chengdu, Sichuan 610066, China | | TAN Jie | Institute of Plant Protection, Sichuan Academy of Agricultural Sciences/Key Laboratory of Integrated Pest Management on Crops in Southwest, Ministry of Agriculture, Chengdu, Sichuan 610066, China | | LI Xing-yue | Institute of Plant Protection, Sichuan Academy of Agricultural Sciences/Key Laboratory of Integrated Pest Management on Crops in Southwest, Ministry of Agriculture, Chengdu, Sichuan 610066, China | | YANG Wen-yu | College agronomy of Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | KANG Hai-qi | Crop Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu, Sichuan 610066, China |
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| Abstract: |
| In order to explore the effective methods and indexes for identifying, evaluating and predicting the drought resistance of new indicia hybrid rice combinations, eleven new indicia hybrid rice combinations (cultivars) were selected as experiment material and were planted in the drought stress environment and alternating wet and dry environment, respectively, in our pot experiment. The yield and related traits of these new indicia hybrid rice combinations had the different responses to drought stress environments. Drought resistance of materials above were identified and evaluated comprehensively by using drought-resistant coefficient, fuzzy membership function method, and comprehensive D value of each material's index. Drought resistance indexes were screened accurately by the principal component analytical method, correlation analysis method and stepwise regression method. The results showed that the tolerance to drought stresses of eleven indicia hybrid rice combinations (cultivars) were markedly different. By the results of cluster analysis in comprehensive D value, C8 was classified as high drought-resistant strain; C1, C2, C7, C9 and C10 as drought-resistant strains; C3, C4 and C5 as intermediate types; Gangyou725 and C6 as weak drought-resistant type. The related agronomic characters of effective panicle, filled grain weight per panicle and seed setting rate were important drought resistance indexes. The regression equation D=(245.231+1.645X2+2.712X4+6.494X6+19.401X7-2.791X10)×10-3, can be used to predict the drought-tolerance ability of new indicia hybrid rice combinations accurately and rapidly. |
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