Insect-specific RNA virus affects the stylet penetration activity of brown citrus aphid(Aphis citricidus)to facilitate its transmission  

作　　者：Xin An Qiaoying Gu Jing Wang Tengyu Chang Wei Zhang Jin-Jun Wang Jinzhi Niu 

机构地区：[1]Key Laboratory of Entomology and Pest Control Engineering,College of Plant Protection,Academy of Agricultural Science,Southwest University,Chongqing,China

出　　处：《Insect Science》2024年第1期255-270,共16页昆虫科学（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China(32072423).

摘　　要：Sap-sucking insects often transmit plant viruses but also carry insect viruses,which infect insects but not plants.The impact of such insect viruses on insect host biology and ecology is largely unknown.Here,we identified a novel insect-specific virus carried by brown citrus aphid(Aphis citricidus),which we tentatively named Aphis citricidus picornavirus(AcPV).Phylogenetic analysis discovered a monophyletic cluster with AcPV and other unassigned viruses,suggesting that these viruses represent a new family in order Picornavirales.Systemic infection with AcPV triggered aphid antiviral immunity mediated by RNA interference,resulting in asymptomatic tolerance.Importantly,we found that AcPV was transmitted horizontally by secretion of the salivary gland into the feeding sites of plants.AcPV influenced aphid stylet behavior during feeding and increased the time required for intercellular penetration,thus promoting its transmission among aphids with plants as an intermediate site.The gene expression results suggested that this mechanism was linked with transcription of salivary protein genes and plant defense hormone signaling.Together,our results show that the horizontal transmission of AcPV in brown citrus aphids evolved in a manner similar to that of the circulative transmission of plant viruses by insect vectors,thus providing a new ecological perspective on the activity of insect-specific viruses found in aphids and improving the understanding of insect virus ecology.

关 键 词：electrical penetration graph feeding behavior insect virus transmission Picornavirales salivary protein 

分 类 号：S436.66[农业科学—农业昆虫与害虫防治]