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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 2种遗传背景差异较大的黄色型棉蚜
The results showed that the natural population of Aphis gossypii was composed of two kinds of individuals, yellow and green, on three kinds of overwintering hosts such as Hibiscus syriacus, Pomegranate and Zanthoxylum bungeanum, Mainly in late spring and early summer, yellow-type individuals gradually dominated, late summer and early autumn and green-based individuals; in the summer host cotton, yellow-type individuals have been dominant, of which 5 to 6 months cotton seedling can be seen part Green type individuals, the proportion of the wintering host on the cotton aphids moved out of the proportion is basically close to the indoor temperature at different conditions for continuous feeding of different body color cotton aphid test results show that the green type of cotton aphids can differentiate green And yellow type, the color change of the offspring is closely related to the temperature. At the higher temperature, the yellow type progeny dominates. At lower temperature, the green type progeny dominates, and the yellow type offspring also produces with the decrease of temperature The offspring of green-type offspring also found that, regardless of feeding temperature changes, the offspring are yellow, indicating that there are two genetic backgrounds in nature than the difference Large yellow cotton aphid