RNA interference targeting ecdysone receptor blocks the larval-pupal transition in Henosepilachna vigintioctopunctata  

作　　者：Jian-Jian Wu Li-Li Mu Wei-Nan Kang Long-Ji Ze Chen-Hui Shen Lin Jin Ahmad Ali Anjum Guo-Qing Li 

机构地区：[1]Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests,College of Plant Protection,Nanjing Agricultural University,Nanjing,China

出　　处：《Insect Science》2021年第2期419-429,共11页昆虫科学（英文版）

基　　金：This research was supported by the N ational Key R&D Program of China(2017YFD0200900);China A griculture Research System(CARS-09-P22).

摘　　要：Henosepilachna vigintioctopunctata is a serious insect pest which attacks a large number of nightshades and cucurbits in Asian countries,Brazil and Australia.Prolonged application of traditional pesticides has caused environmental pollution and exerted deleterious effects on human health.Finding new approaches with high target specificity and low environmental contamination has become an urgent task.RNA interference(RNAi)induced by double-stranded RNA(dsRNA)is expected to be applicable to managing this pest.Here we evaluated the effects of Escherichia co/Z-expressed dsRNAs targeting ecdvsone receptor(EcR)gene via dietary delivery in laboratory and foliar spraying in a greenhouse.The target transcript was successfully knocked down when the 4th-instar larvae had fed on potatofoliage dipped with dsEcR in a laboratory bioassay.Around 85%of the HvEcR RNAi larvae remained as prepupae or became abnormal pupae,and failed to emerge into adults.Ingestion of ds£c7?-immersed foliage by the 3rd-instar larvae effectuated a comparable RNAi response and brought about more severe defects:all the resultant larvae arrested development,remained as prepupae and finally died.For assay in the greenhouse,a ds£c7?-contained E.coli suspension was directly sprayed to the foliage of greenhouse-growing potato plants and the 3rd-and 4th-instar larvae were transferred to the leaves.High RNAi efficacy was obtained and identical RNAi phenotypes were observed in treated larvae.In addition,spraying dsEcR reduced leaf damage.Our results indicate a possibility of practical application of dsEcR as an environmentally friendly RNA pesticide to control H.vigintioctopunctata larvae.

关 键 词：bacterially expressed double-stranded RNA ECDYSIS ecdysone receptor Henosepilachna vigintioctopunctata 

分 类 号：S433[农业科学—农业昆虫与害虫防治]