关键词: 陆地棉, 复合盐碱胁迫, 耐盐系数, 综合评价

Abstract: This paper determined the 9 agronomic traits of upland cotton under complex salt-alkali stress  including chlorophyll content (Chl), plant height (PH), fruit branch (FB), fruit node (FN), height of the first node (HFN), leaf area (LA), boll number (BN), boll weight (BW), lint percent (LP) by using 119 domestic and abroad upland cotton varieties resources. Then the salt tolerance of upland cotton was evaluated by membership function method of fuzzy mathematics. The results showed that: there were differences in the salt tolerance coefficients of Chl, PH, FB, FN, HFN, LA, BN, BW and LP of upland cotton in different regions under complex salt-alkali stress, in which  the differences of LP, BW and Chl were small with the variation coefficient of 0.078~0.171. However, FN, BN and LA were significantly different with a variation coefficient of 0.34~0.48. The comprehensive evaluation results showed that among 119 upland cotton variety resources, most of the materials were salt tolerance sensitivity (42.8%) and medium salt tolerance (37.0%), and 20 materials with high salt tolerance and salt tolerance, such as YM 15, KK-1047 and XLZH 69 etc., were selected which could be used as the parental lines of upland cotton for improvement of  salt tolerance.

Key words: upland cotton, complex salt-alkali tolerance, salt tolerant coefficient；comprehensive assessment