Effects of a presumably protective endosymbiont on life-history characters and their plasticity for its host aphid on three plants.

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ID: 14256
2018
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Abstract
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.
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Authors Li, Shirong;Liu, Deguang;Zhang, Rongfang;Zhai, Yingting;Huang, Xianliang;Wang, Da;Shi, Xiaoqin;
Journal Ecology and evolution
Year 2018
DOI
10.1002/ece3.4754
URL
Keywords Keywords not found

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