| Identification and evaluation of drought tolerance of 301 wheat varieties (lines) at germination stage |
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| DOI：10.7606/j.issn.1000-7601.2019.03.01 |
| Key Words: wheat germplasm seed germination stage identification of drought tolerance cluster analysis principal components analysis |
| Author Name | Affiliation | | REN Yi | College of Agronomy, Key Laboratory of Agricultural Biological Technology, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | YAN AN | College of Pratacultural and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHANG Fang | College of Agronomy, Key Laboratory of Agricultural Biological Technology, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | XIA Xian-chun | Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Wheat Improvement Center, Beijing 100081 | | XIE Lei | College of Agronomy, Key Laboratory of Agricultural Biological Technology, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | GENG Hong-wei | College of Agronomy, Key Laboratory of Agricultural Biological Technology, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| In this study, a simulated drought stress environment of -0.5 MPa PEG-6000 was used to germinate and culture the seeds of 301 winter wheat varieties (lines) in the artificial climate chamber during the germination period. The germination potential, germination rate, germination index, root number, root length, seedling height and coleoptile length were measured. The drought tolerance was evaluated by the membership function method, cluster analysis and factor analysis. The relative values of the indexes were significantly and positively correlated with those of the controls. Using membership function method to rank drought tolerance, it was found that there were great differences among wheat varieties, the range of D value was 0.08~0.95. By using cluster analysis, we divided all varieties into 5 groups according to drought tolerance. Eight varieties (lines) such as Gaocheng 8901 were highly drought resistant type; 29 varieties (lines) such as Zhoumai 22 were the drought\|resistant type; 116 varieties (lines) such as Lumai 8 were the medium drought\|resistant type; 83 varieties (lines) such as Shi 4185 were the drought\|sensitive type; 65 varieties (lines) such as Yannong 18 were the highly sensitive drought type. The results of principal component analysis showed that the maximum load of germination index, root length and root number were 0.96, 0.88 and 0.91, respectively. The distribution of different drought tolerant types of wheat regions showed that 8 wheat varieties (lines) with high drought tolerance were all from China. Five of the germplasm were from the northern winter wheat region. The germplasms with high drought tolerance in germinating period were Chuanmai 44, Wanmai 33, Gaocheng 8901, CA9719, Zhou 8425B, Ningdong 10, Xinmai 37 and CA0958. The germinating index, root length and root number can be used as reliable indicators for drought tolerance identification in the germinating stage of wheat, and the northern winter wheat region can be used as a key wheat area to excavate drought\|tolerant critical germplasm. |
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