245份陆地棉品种农艺性状及产量构成综合评价OA北大核心CSTPCD

[Objective]Through the analysis and research on the agronomic traits and yield structure of 245 upland cotton varieties,the relationship between the traits was clarified,and the varieties with excellent comprehensive traits were selected.[Methods]The 11 traits were comprehensively evaluated by variability a-nalysis,correlation analysis,principal component analysis and cluster analysis.[Results]The results showed that the variation coefficient of seed cotton yield of 245 upland cotton varieties was the highest(12.79%),and the number of fruit branches was the lowest(3.61%).The lowest number of fruit branches was 3.61%.The seed cotton yield was significantly positively correlated with the height of the first fruit branch,the number of fruit nodes,the number of bolls per plant,the number of bolls per branch and the number of bolls per plant.Five principal components were extracted by principal component analysis,with a cumulative contribu-tion rate of 78.44%.Among them,PC1 is a boll-forming factor,PC2 is a plant type factor,PC3 is a boll weight factor,PC4 is a lint factor,and PC5 is a fruit branch factor;the materials were divided into five catego-ries by cluster analysis.There were 55 materials in the first category,82 materials in the second category,12 materials in the third category,7 materials in the fourth category,and 89 materials in the fifth category.[Con-clusion]Branch-bearing bolls and node-bearing bolls are important factors determining cotton yield,which can be further used as selection criteria for improving cottonseed yield of different traits.The large boll varieties represented by C73-27 and Xinluzao 25,and the varieties with excellent comprehensive traits such as Lumi-an27,Ganmian17 and 18N4 were selected.