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The endosymbiont Serratia symbiotica improves aphid fitness by disrupting the predation strategy of ladybeetle larvae

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INSECT SCIENCE 2024年第5期31卷 1555-1568页

作者： Wang, Zheng-Wu Zhao, Jin Li, Guang-Yun Hu, Die Wang, Zi-Guo Ye, Chao Wang, Jin-Jun Southwest Univ Coll Plant Protect Key Lab Entomol & Pest Control Engn Chongqing Peoples R China Southwest Univ Acad Agr Sci Int Joint Lab China Belgium Sustainable Crop Pest Chongqing Peoples R China Southwest Univ Key Lab Agr Biosafety & Green Prod Upper Yangtze R Chongqing Peoples R China Southwest Univ Acad Agr Sci Coll Plant Protect Key Lab Entomol & Pest Control Engn Chongqing Peoples R China

Aphids, the important global agricultural pests, harbor abundant resources of symbionts that can improve the host adaptability to environmental conditions, also control the interactions between host aphid and natural enemy, resulting in a significant decrease in efficiency of biological control. The facultative symbiont Serratia symbiotica has a strong symbiotic association with its aphid hosts, a relationship that is known to interfere with host-parasitoid interactions. We hypothesized that Serratia may also influence other trophic interactions by interfering with the physiology and behavior of major predators to provide host aphid defense. To test this hypothesis, we investigated the effects of Serratia on the host aphid acyrthosiphon pisum and its predator, the ladybeetle Propylaea japonica. First, the prevalence of Serratia in different A. pisum colonies was confirmed by amplicon sequencing. We then showed that harboring Serratia improved host aphid growth and fecundity but reduced longevity. Finally, our research demonstrated that Serratia defends aphids against P. japonica by impeding the predator's development and predation capacity, and modulating its foraging behavior. Our findings reveal that facultative symbiont Serratia improves aphid fitness by disrupting the predation strategy of ladybeetle larvae, offering new insight into the interactions between aphids and their predators, and providing the basis of a new biological control strategy for aphid pests involving the targeting of endosymbionts.

关键词： aphids biological control defense predator Serratia symbiotica PEA APHID FACULTATIVE ENDOSYMBIONT BACTERIAL ENDOSYMBIONTS CONFERRED RESISTANCE acyrthosiphon-pisum NATURAL-POPULATIONS SYMBIONTS EVOLUTION ELIMINATION PARASITOIDS

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