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Discovery of a widespread presence bunyavirus that may have symbiont-like relationships with different species of aphids

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Insect Science 2022年第4期29卷 1120-1134页

作者： Xin An Wei Zhang Chao Ye Guy Smagghe Jin-Jun Wang Jinzhi Niu Key Laboratory of Entomology and Pest Control Engineering College of Plant ProtectionSouthwest UniversityChongqingChina International Joint Laboratory of China–Belgium on Sustainable Crop Pest Control Academy of Agricultural SciencesSouthwest UniversityChongqingChina Department of Plants and Crops Faculty of Bioscience EngineeringGhent UniversityGhentBelgium

Aphids are important agricultural pests,vectors of many plant viruses and have sophisticated relationships with symbiotic microorganisms.Abundant asymptomatic RNA viruses have been reported in aphids due to the application of RNA-seq,but aphid-virus interactions remain unclear.Bunyavirales is the most abundant RNA virus order,which can infect mammals,arthropods,and plants.However,many bunyaviruses have specific hosts,such as insects.Here,we discovered 18 viruses from 10 aphid species by RNA-seq.Importantly,a widespread presence bunyavirus,Aphid bunyavirus 1(ABV-1),was determined to have a wide host range,infecting and replicating in all 10 tested aphid species.ABV-1 may be transmitted horizontally during feeding on plant leaves and vertically through reproduction.In a comparison of the physiological parameters of ABV-1high and ABV-1low strains of pea aphid,higher ABV-1 titers reduced the total nymphal duration and induced the reproduction.Moreover,viral titer significantly affected the lipid and protein contents in pea aphids.In summary,we proposed that ABV-1 may have stable symbiont-like relationships with aphids,and these observations may provide a new direction for studying bunyaviruses in aphids and establishing a model for virus-aphid interactions.

关键词： insec-specific virus pea aphid Phasmaviridae RNA virus RNAi

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