对采自桃树、油菜和烟草上的烟蚜的核型研究表明 :在红、黄绿两种体色的烟蚜中发现 5种核型 ,即2n =12 ,正常 ;2n =12 ,A1与A3 易位 ;2n =11;2n =13;3n =18,A1与A3 易位 .同时 ,在核型为 2n =12的烟蚜中 ,体色为红色的个体全为A1与A3 易位个体 ,体色为绿色的个体中既有A1与A3 易位个体 ,又有正常个体 .寄主植物不同的烟蚜的各条染色体相对长度在 2n =12核型中差异不显著 (α =0 .0 5 ) .图 1表 4参 19 The karyotypes of peach aphids collected from peach, rape and tobacco showed that five karyotypes were found in two kinds of body color aphids: red, yellow and green, ie 2n = 12, normal; 2n = 12, A1 With the translocation of A3, 2n = 11, 2n = 13, 3n = 18 and A1 and A3 translocations, while in the aphids with 2n = 12 karyotype, individuals with red body color were all A1 and A3 translocations Individuals with body color green had both translocations A1 and A3 as well as normal individuals.The relative length of each chromosome of different Myzus persicae in host plants was not significantly different in 2n = 12 karyotype (α = 0. 0 5). Figure 1 Table 4 参 19