| Comprehensive evaluation of cotton drought tolerance indexes and gray relational analysis |
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| DOI：10.7606/j.issn.1000-7601.2019.01.33 |
| Key Words: cotton agronomic indexes comprehensive drought resistance evaluation gray relational analysis |
| Author Name | Affiliation | | SUN Feng-lei | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | QU Yan-ying | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | CHEN Quan-jia | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | GAO Wen-wei | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| By conducting field water stress on 30 cotton varieties during the flowering and boll stages, we determined photosynthesis indexes in the 10th of stress and took samples to determine malondialdehyde (MDA), chlorophyll (a,b,a+b), superoxide dismutase (SOD), proline (Pro), and the major agronomic indexes. The drought tolerance of cotton was comprehensively evaluated by combining drought-tolerance indexes, drought tolerance coefficient, and grey correlation analysis. According to drought tolerance metric (D value), the 30 tested varieties were categorized as 4 groups including high drought tolerance (Beiersinuo, Chuan 98, Kuke C310-5100, KK 1543, Zhong R2015), moderate drought-tolerance (13 varieties including Xinluzao 49, Xinluzhong 8, and Zhong R773-1), low drought-tolerance (8 varieties including Xinluzao 47, Liao 18, and Fuyide 998), and sensitive drought-tolerance (Junmian1, Zhong R2009, Xinluzao 26, and Xinluzhong 58). Through the gray relational analysis of 16 indexes and D values, correlation of the indexes to the D values were ranked as effective number of bolls>total number of bolls>effective number of boll branches >Gs>Tr> number of boll branches>MDA>total chlorophyll>Pn>chlorophyll b>plant height>WUE>chlorophyll a>Pro>Ci>SOD. Under drought stress, the cotton agronomic phenotypic indexes were very sensitive. Meanwhile, MDA and total chlorophyll both were more sensitive than other physiological and biochemical indicators and transpiration rate (Tr), stomatal conductance (Gs), and net photosynthetic rate (Pn) were more sensitive than other photosynthetic index. According to the comprehensive drought resistance index, cluster analysis, gray correlation and soon, we comprehensively evaluated the drought resistance of 30 materials. |
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