棉蚜Aphis gossypii Glover在不同寄主上的体色分化研究

Study on the body color differentiation of Aphis gossypii Glover from different host

对不同寄主上不同时期棉蚜的体色分化进行比较研究 结果表明 ,棉蚜自然种群由黄色型和绿色型 2种个体组成 .在木槿、石榴和花椒 3种越冬寄主上 ,早春以绿色型个体为主 ,春末夏初黄色型个体逐渐占优势 ,夏末秋初又以绿色型个体为主 ;在夏季寄主棉花上 ,黄色型个体一直占优势 ,其中 5～ 6月份棉花苗期可见到部分绿色型个体 ,所占比例与越冬寄主上棉蚜迁出时所占的比例基本接近 .在室内不同温度条件下连续饲养不同体色棉蚜的试验结果表明 ,绿色型棉蚜可分化出绿色型和黄色型 2种后代 ,后代的体色变化与温度密切相关 ,在温度较高时黄色型后代占优势 ,在温度较低时绿色型后代占优势 ,而且黄色型后代随温度的降低也会产生出绿色型后代 .系统饲养黄色干母的后代还发现 ,不论饲养温度如何变化 ,其后代均为黄色型 ,表明自然界有

Experiments were carried out to study the color differentiation in different periods of Aphis gossypii from Hibiscus syriacus, Punica granatum, Zanthoxylum simulans and cotton plants Results show that the cotton aphis have yellow and green individuality On the Hibiscus syriacus, Punica granatum, Zanthoxylum simulans ,the green individuality occupies the dominant position in early spring, the yellow individuality is occupying the dominant position from late spring to early summer, and the green individuality is occupying dominant position from late summer to early autumn From May to June, the yellow individuality occupies dominant position on the cotton plant; its proportion is similar to that of the migratory aphid on the winter host plants Under the different temperature (20℃, 24℃, 27℃) the yellow and the green individuality continuously reared and the color differentiation in different temperature investigated,the results show that the color differentiation of the Aphis gossypii Glover is closely related to the temperature Yellow fundatrix were collected, reared under different conditions, The offspring body color of yellow fundatrix remained unchanged It shows that there are two yellow individualities in nature whose backgrounds of inheritance are different