| Identification and comprehensive assessment of drought resistance of upland cotton variety resources during flower and boll stage |
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| DOI：10.7606/j.issn.1000-7601.2021.02.20 |
| Key Words: upland cotton variety resource drought resistance bud stage indfentification comprehensive assessment |
| Author Name | Affiliation | | ZHENG Juyun | Economic Corps Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China | | WANG Junduo | Economic Corps Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China | | GONG Zhaolong | Economic Corps Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China | | Liang Yajun | Economic Corps Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China | | Zhang Zeliang | Agricultural College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | AI Xiantao | Economic Corps Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China | | GUO Jiangping | Economic Corps Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China | | MO Ming | Economic Corps Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China | | LI Xueyuan | Economic Corps Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China |
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| Abstract: |
| This paper determined the 19 agronomic traits of upland cotton under field drought stress including plant height (PH), the height of the first node of fruit branch (HFNFB), the first node of fruit branch (FNFB), leaf area (LA), fruit branch (FB), fruit nodes (FN), boll number (BN), boll weight (BW), seed cotton yield per plant (SYP), lint percentage (LP), fiber length (FL), fiber strength (FS), micronaire (MIC), uniformity (UNI), elongation (EL), chlorophyll content (Chl), malonaldehyde (MDA), proline (PRO), and superoxide dismutase (SOD) by using 272 domestic and foreign upland cotton variety resources during flower and boll stages. Then, the drought resistance of upland cotton was evaluated by comprehensive drought resistant index (CDI), drought resistance comprehensive evaluation values (D), weighted drought resistant index (WDI) and clustering analysis. The result showed that there was significant positive correlation between comprehensive drought resistant index (CDI), weighted drought resistant index (WDI), and drought resistance comprehensive evaluation values (D). According to the D-value cluster analysis results, 272 varieties were divided into five grades: the strong drought-resistance grade included four varieties of Guannong 1, Yumian 1, Liaomian 9, and Liaomian 16; the drought-resistance grade included 24 varieties, such as Yinmian 2, Daizimian 16, and Xinluzhong 10, etc.; the drought-tolerance grade included 134 varieties, such as 18N3, Si6524, and Xinluzhong No. 82, etc; the slight drought-sensitive grade included 100 varieties, such as Ekangmian 8, Xinluzhong 65, Xinluzhong 22, etc. ; the drought-sensitive grade included 10 varieties, such as 150030, Ekangmian 10, Jin cotton 12 , etc. CDI value, D value and WDI value had extremely significant positive correlation (correlation coefficient was above 0.958), and the evaluation results were basically the same. D value was the main factor, and the combination of CDI value and WDI value could effectively and accurately evaluate the drought resistance characteristics of cotton at flowering and boll stage. The selected drought-resistant cultivar resources such as Guannong No.1, Yumian No.1, and Liaomian No.9 could provide specific resources for genetic improvement of drought-resistant cotton. UNI, FS, Chl, FN, BN, and BW could be used as important identification indexes for drought resistance of upland cotton variety resources during flower and boll stages. |
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