图3. 棉花抗/感品种在门（A）和属（B）水平下土壤细菌群落结构的主成分分析
红色、绿色和黄色分别代表盛花期、开花后期和结铃期,星形代表感病品种鄂荆1号（EJ）,圆形代表抗病品种冀863（J863）,椭圆代表品种在不同时期的微生物群落组成Red, green and yellow represent flowering, late flowering and boll-forming stages, respectively. The star represents the susceptible variety EJ, and the round represents the resistant variety J863. The ellipse represents the microbial community composition of the variety at different stages门水平Phylum level：Proteobacteria变形菌门;Acidobacteria酸杆菌门;Actinobacteria放线菌门;Gemmatimonadetes芽单孢菌门;Chloroflexi绿弯菌门;Bacteroidetes拟杆菌门;Planctomycetes浮霉菌门;Nitrospirae硝化螺旋菌门;Verrucomicrobia疣微菌门;Armatimonadetes装甲菌门;Firmicutes 厚壁菌门。属水平Genus level：Sphingomonas鞘氨醇单胞菌属;Lysobacter溶杆菌属;Gemmatimonas芽单胞菌属;Nitrospira硝化螺菌属;Blastococcus芽球菌属;Rubrobacter红色杆菌属;Nocardioides类诺卡氏属;Streptomyces链霉菌属;Micromonospora微单孢菌属

Fig. 3. Principal component analysis of soil bacterial community structure of cotton resistant/susceptible varieties at phylum (A) and genus (B) levels