Zhao Dong-Xiao, Zhang Xiang-Fei, Hong Xiao-Yue
Department of Entomology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China.
Environ Entomol. 2013 Jun;42(3):445-52. doi: 10.1603/EN12354.
Inherited bacteria Wolbachia, and more recently Cardinium, have received a great deal of attention for their ability to manipulate the reproduction and fitness of their host species. Wolbachia and Cardinium have been found to co-infect the same host species. In this study, both Wolbachia and Cardinium were found to manipulate host reproduction through cytoplasmic incompatibility and to affect the male-biased sex-ratio in the doubly infected spider mite Tetranychus truncates Ehara. We also investigated effects of double infection with Wolbachia and Cardinium on host fecundity and longevity. Results indicated that Wolbachia and Cardinium increased the fecundity of doubly infected females, although no infection effect on host longevity was observed. Our most important finding was that the mating of uninfected mites facilitated the proliferation of Wolbachia and Cardinium in double-infected mites. We discuss the results observed with respect to the spread of bacterial infection in natural populations and the evolution of the endosymbiont-T. truncates symbiosis.
遗传性细菌沃尔巴克氏体（Wolbachia），以及最近发现的卡丁氏体（Cardinium），因其能够操控宿主物种的繁殖和适合度而备受关注。人们发现沃尔巴克氏体和卡丁氏体能共同感染同一宿主物种。在本研究中，沃尔巴克氏体和卡丁氏体均被发现可通过细胞质不亲和性操控宿主繁殖，并影响双重感染的截形叶螨（Tetranychus truncates Ehara）偏向雄性的性别比例。我们还研究了沃尔巴克氏体和卡丁氏体双重感染对宿主繁殖力和寿命的影响。结果表明，沃尔巴克氏体和卡丁氏体提高了双重感染雌螨的繁殖力，不过未观察到对宿主寿命的感染效应。我们最重要的发现是，未感染螨的交配促进了双重感染螨体内沃尔巴克氏体和卡丁氏体的增殖。我们讨论了在自然种群中观察到的关于细菌感染传播以及内共生菌与截形叶螨共生关系进化的结果。
