Li Shirong, Liu Deguang, Zhang Rongfang, Zhai Yingting, Huang Xianliang, Wang Da, Shi Xiaoqin
State Key Laboratory of Crop Stress Biology for Arid Areas (Northwest A&F University) Yangling Shaanxi Province China.
College of Plant Protection Northwest A&F University Yangling Shaanxi Province China.
Ecol Evol. 2018 Dec 11;8(24):13004-13013. doi: 10.1002/ece3.4754. eCollection 2018 Dec.
is well known for its protective roles against parasitoids for its aphid hosts, but its functional roles in insect-plant interactions are less understood. Thus, the impact of infections on life-history characters and the underlying genetic variation for the grain aphid, (Fabricius), was explored on three plants (i.e., wheat, oat, and rye). Compared to cured lines, infected lines of had lower fecundity on wheat and oat, but not on rye, suggesting an infection cost for the aphid on susceptible host plants. However, when tested on rye, the infected lines showed a shorter developmental time for the nymphal stage than corresponding cured lines, showing some benefit for carrying the endosymbiont on resistant host plants. The infection of altered genetic variation underlying its host 's life-history characters, which was shown by differences in heritabilities and genetic correlations of life-history characters between lines infected and cured of the endosymbiont. This was further substantiated by disparity in G-matrices of their life-history characters for the two types of aphid lines. The G-matrices for life-history characters of aphid lines infected with and cured of were significantly different from each other on rye, but not on oat, suggesting strong plant-dependent effects. The developmental durations of infected lines showed a lower plasticity compared with those of corresponding cured lines, and this could mean higher adaptability for the infected lines.Overall, our results showed novel functional roles of a common secondary endosymbiont (i.e., ) in plant-insect interactions, and its infections could have significant consequences for the evolutionary ecology of its host insect populations in nature.
因其对蚜虫宿主具有抵御寄生蜂的保护作用而闻名，但其在昆虫与植物相互作用中的功能作用却鲜为人知。因此，在三种植物（即小麦、燕麦和黑麦）上探究了感染对禾谷缢管蚜（Fabricius）生活史特征及潜在遗传变异的影响。与未感染品系相比，感染的禾谷缢管蚜品系在小麦和燕麦上的繁殖力较低，但在黑麦上并非如此，这表明蚜虫在易感宿主植物上存在感染成本。然而，在黑麦上测试时，感染品系若虫期的发育时间比相应的未感染品系短，这表明携带内共生菌对蚜虫在抗性宿主植物上有一定益处。禾谷缢管蚜的感染改变了其宿主生活史特征的潜在遗传变异，这通过感染和未感染内共生菌的品系之间生活史特征的遗传力和遗传相关性差异得以体现。两种类型蚜虫品系生活史特征的G矩阵差异进一步证实了这一点。感染和未感染的禾谷缢管蚜品系在黑麦上生活史特征的G矩阵彼此显著不同，但在燕麦上并非如此，这表明存在强烈的植物依赖性效应。与相应的未感染品系相比，感染的禾谷缢管蚜品系发育持续时间的可塑性较低，这可能意味着感染品系具有更高的适应性。总体而言，我们的结果表明一种常见的次生内共生菌（即）在植物 - 昆虫相互作用中具有新的功能作用，其感染可能对自然界中宿主昆虫种群的进化生态学产生重大影响。
