烟粉虱体内营养物质对寄主植物多代诱导的响应

比较同一遗传背景的B型烟粉虱Bemisia tabaci Gennadius种群成虫在甘蓝、黄瓜和一品红上的适合度差异,测定3种寄主植物主要营养差异,并分析饲养不同时间后成虫体内的蛋白质、氨基酸和游离脂肪酸含量的多代变化规律。结果发现,B型烟粉虱成虫在黄瓜上的相对适合度最高,其次是甘蓝,在一品红上适合度最低,这可能与黄瓜叶片的总氮含量高和总糖含量低有关。饲养时间对烟粉虱体内主要营养物质含量没有显著影响,但寄主植物对烟粉虱成虫体内主要营养物质含量影响显著。在黄瓜上饲养烟粉虱成虫体内蛋白质含量都显著高于一品红和甘蓝上烟粉虱成虫的蛋白质含量,在黄瓜上饲养烟粉虱成虫总氨基酸含量都显著低于一品红和甘蓝上烟粉虱成虫的总氨基酸含量。相反,在3种寄主上饲养烟粉虱成虫游离脂肪酸含量都无显著差异。可见,寄主植物对B型烟粉虱体内主要营养物质组成影响显著,但饲养时间对B型烟粉虱体内主要营养物质组成影响较小。

Nutrient content of successive generations of Bemisia tabaci reared on different host plants

The fitness of F0 Bemisia tabaci adults reared on cabbage, cucumber and poinsettia was compared and the protein, total amino acid and free fatty acid content of their offspring determined after multiple generations had fed on these three host species. The protein content of B. tabaci adults reared on cucumber was significantly higher than that of those reared on poinsettia and cabbage after 1, 3, and 6 months. However, adults reared on cucumber had significantly lower total amino acid content compared with those reared on cabbage or poinsettia. There was no significant difference in the free fatty acid content of B. tabaci adults reared on cucumber, cabbage or poinsettia, regardless of rearing time. On the other hand, our results indicate significant differences in the nutrient composition of cabbage, cucumber and poinsettia. In addition, the fitness of the F0 generation of B. tabaci adults reared on cucumber was higher than that of those reared on cabbage and poinsettia, which is consistent with the higher protein content of cucumber leaves relative to those of the other two host species. Overall, our results suggest that differences in the nutrient composition of B. tabaci adults primarily reflect differences in the nutrient composition of host plants rather than rearing time.