关键词: 瓜棉套作模式; 陆地棉; 主成分分析; 聚类分析; 判别分析; 加权关联度分析

Abstract: 【Objective】 To evaluate and select upland cotton varieties suitable for melon-cotton intercropping patter based on the morphological indexes and yield indexes.【Methods】The evaluation of quantitative traits about plant height, fruiting sites and position, number of fruit branch, open bolls number per plant, effective bolls number per plant, boll weight, lint percentage, seed cotton yield, lint yield and breeding time of 14 cotton varieties under the condition of cotton and melon intercropping pattern were evaluated by correlation analysis, principal components analysis, hierarchical cluster analysis and Stepwise discriminant analysis, etc.【Result】The results of the correlation analysis showed that the correlations were complex between 10 quantitative traits,because 3 of these coefficients were extremely significantly correlated at P< 0.01 and 2 of these coefficients were significantly correlated at P< 0.05;The results of the principal components analysis showed that the first five principal components represent 89.77% of the information which was the 10 quantitative traits of the 14 cotton varieties. The contribution rates were respectively 26.89%, 21.94%, 18.19%, 13.23% and 9.53%;The results of the hierarchical cluster analysis showed that the 14 cotton cultivars were clustered into three categories when the class separation distance was 4.75. Among them, the first class, whose form was not luxuriant with low yield, had 6 varieties, the class Ⅱ, whose form was more luxuriant with the highest yield, had 2 varieties, the class Ⅲ, whose form was the most luxuriant with a higher yield, had 6 varieties;The results of the Stepwise discriminant analysis showed that the results of cluster analysis were accurate and reliable,whose identification rate was 100%;The results of the correlation analysis showed that the varieties with higher weighted incidence degree than daizi-80 (CK) included: Xingnong 7, Upland Cotton series 1, Xinluzhong 49, Xinluzhong 51, Xinluzhong 40 and Zhongmian 63.【Conclusion】According to hierarchical cluster analysis, Stepwise discriminant analysis and weighted correlation analysis, it was considered that: Xingnong No.7 and Xinluzhong No.51, had production potential and popularization and application value under the melon-cotton intercropping pattern in Turpan. Upland cotton No. 1, Xinluzhong No. 40 and Xinluzhong No. 49 could be used as reserve varieties.

Key words: cotton and melon intercropping pattern; upland cotton; principal components analysis; hierarchical cluster analysis; discriminant analysis; weighted correlation analysis