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

作　　者：Zheng-Wu Wang Jin Zhao Guang-Yun Li Die Hu Zi-Guo Wang Chao Ye Jin-Jun Wang 

机构地区：[1]Key Laboratory of Entomology and Pest Control Engineering,College of Plant Protection,Southwest University,Chongqing,China [2]International Joint Laboratory of China-Belgium on Sustainable Crop Pest Control,Academy of Agricultural Sciences,Southwest University,Chongqing,China [3]Key Laboratory of Agricultural Biosafety and Green Production of Upper Yangtze River,Southwest University,Chongqing,China

出　　处：《Insect Science》2024年第5期1555-1568,共14页昆虫科学（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China(32102195);the National Natural Science Foundation of China-Major International(Regional)Joint Research Project(32020103010);the Natural Science Foundation of Chongqing,China(CSTB2022NSCQ-MSX0748);Fundamental Research Funds for the Central Universities of China(SWUKQ22020).

摘　　要：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 ampli-con 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 capac-ity,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 provid-ing 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 

分 类 号：Q96[生物学—昆虫学]