Hap4型棉蚜取食西葫芦后的寄主适应性变化

棉蚜寄主间转移是常见的现象，在寄主转移过程中的寄主适应能力转变是其重要的生物学特性。为了解棉蚜取食西葫芦不同世代后，对其他寄主适应能力的转变，探究取食经历对棉蚜寄主适应性变化的影响，本试验利用寄主转接试验，将采自棉花上的Hap4型棉蚜转接到西葫芦上，分别测定取食西葫芦不同世代后，对棉花、黄瓜和西葫芦的适应能力。结果显示，随着取食西葫芦代数的增加，Hap4型棉蚜对原寄主棉花的适应性逐渐降低。Hap4型棉蚜取食西葫芦一代后就对黄瓜有良好的寄主适应性，并呈现较为稳定的趋势。Hap4型棉蚜对西葫芦的寄主适应性随着在西葫芦上取食代数的增加而降低，但强于在原寄主上的寄主适应性。除此之外，本试验也发现取食西葫芦后的Hap4型棉蚜的寄主适应性表现为黄瓜>西葫芦>棉花。植食性昆虫的取食经历影响其寄主适应能力，Hap4型是棉蚜主要的生物型之一，其取食经历直接影响其寄主适应性，研究结果为生产中作物布局及棉蚜的生态调控技术应用提供理论基础。

Host adaptation of Hap4 cotton aphid after feeding on zucchini

Host transfer of cotton aphid is a common phenomenon, and host adaptation is an important biological characteristic in the process of host transfer. Effect of feeding experience on the change of host adaptability of cotton aphid was investigated after feeding on zucchini for different generations. Hap4 cotton aphid from cotton was transferred to zucchini and its adaptability to cotton, cucumber and zucchini was measured after feeding on zucchini for different generations. The results showed that with the increase of generations of Hap4 cotton aphid fed with zucchini, the adaptability of Hap4 cotton aphid to the original host cotton decreased gradually. Hap4 cotton aphid had good host adaptability to cucumber after feeding on zucchini for one generation, and showed a relatively stable trend. The host adaptability of Hap4 cotton aphid to zucchini decreased with the increased generation on zucchini, but stronger than that of cotton aphid on the original host. In addition, the host adaptation of Hap4 cotton aphid after feeding on zucchini was found to be cucumber > zucchini > cotton. The feeding experience of phytophagous insects affects their host adaptation ability. Hap4 cotton aphid is one of the main biotypes of cotton aphid, and its feeding experience directly affects its host adaptation. The above results provide a theoretical basis for the application of crop layout and ecological control techniques of cotton aphid in production.