| Comprehensive evaluation of drought resistance of three new wheat cultivars at germination and seedling stage |
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| DOI：10.7606/j.issn.1000-7601.2016.06.35 |
| Key Words: wheat germination stage seedling stage PEG stress drought resistance |
| Author Name | Affiliation | | ZHANG Long-long | College of Agronomy, Northwest A&F University, Yangling Shaanxi 712100, China | | YANG Ming-ming | College of Agronomy, Northwest A&F University, Yangling Shaanxi 712100, China | | DONG Jian | College of Agronomy, Northwest A&F University, Yangling Shaanxi 712100, China | | ZHAO Wan-chun | College of Agronomy, Northwest A&F University, Yangling Shaanxi 712100, China | | GAO Xiang | College of Agronomy, Northwest A&F University, Yangling Shaanxi 712100, China | | CHEN Dong-yang | College of Agronomy, Northwest A&F University, Yangling Shaanxi 712100, China |
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| Abstract: |
| In order to identify the drought resistance of three new wheat cultivars Xinong 538, Xinong 556 and Xinong 558, three wheat cultivars Jinmai 47, Xiaoyan 22 and Xinong 979 with different drought resistance and large area of promotion were taken as control. The experiment was conducted under four PEG-6000 treatments (5%, 10%, 15% and 20%) for six wheat cultivars. 12 indices (germination rate, germination potential, coleoptile length, SOD, CAT, etc.) was investigated during germination and seedling stage. The comprehensive evaluation for wheat drought resistance was conducted by correlation analysis, principal component analysis and subordinate function analysis. The results indicated that there existed different degree of correlation among these indices and these indices had different effects on the drought resistance of the varieties. By principal component analysis, 12 indices was transformed to three (under 15% and 20% PEG-6000) or four (under 5% and 10% PEG-6000) independent and synthesized indices, and the accumulative contribution rate were 92.61%%, 92.96%, 88.74% and 93.12% for stress treatments of 5%, 10%, 15% and 20%, respectively. According to the synthetic evaluation value (D), six wheat cultivars were divided into three groups, in which “Xinong 538” and “Jinmai 47” belonged to the high drought resistance group, “Xinong 558” and “Xiaoyan 22” belonged to the medium drought resistance group, and “Xinong 556” and “Xinong 979” belonged to the low drought resistance group. |
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