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Identification and expression profiles of gustatory receptor genes in Bactrocera minax larvae(Diptera:Tephritidae):Role of BminGR59f in larval growth

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Insect Science 2022年第5期29卷 1240-1250页

作者： Guijian Zhang Shuai Cao Tong Guo Haoran Wang Xuewei Qi Xueming Ren Changying Niu Hubei Key Laboratory of Insect Resource Application and Sustainable Pest Control College of Plant Science&TechnologyHuazhong Agricultural UniversityWuhanChina

Insects employ various types of gustatory receptors(GRs)to identify nutrient-rich food and avoid toxic *** larval gustatory system is the critical checkpoint for food acceptance or *** a specialist herbivore,the larvae of Bactrocera minax feed only on unripe citrus ***,how larvae use GRs to check and adapt to the secondary metabolites in unripe citrus fruits remains *** this study,we first performed developmental expression profiles showing that most BminGRs genes were highly expressed in 1st and 2nd instar larvae and that tissue-specific expression indicated high expression of most BminGRs genes in the mouthparts of 2nd instar ***,we found that silencing BminGR59f by RNA interference(RNAi)affected the growth of 2nd instar *** *** and naringin were screened as ligands of BminGR59f via RNAi and cell calcium imaging,and the combination of these two flavones increased the body weight of *** summary,we identified a novel gustatory perception pattern in *** for detecting hesperidin and naringin,which boosted the growth of *** *** results shed light on how specialist herbivores detect and adapt to host metbolites in adverse environments depending on larval GRs.

关键词： gustatory receptors secondary metabolites specialist herbivores tephritid unripe citrus fruits

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Tree diversity increases levels of herbivore damage in a subtropical forest canopy:evidence for dietary mixing by arthropods?

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Journal of Plant Ecology 2017年第1期10卷 13-27页

作者： Matteo Brezzi Bernhard Schmid Pascal A.Niklaus Andreas Schuldt Department of Evolutionary Biology and Environmental Studies and Zürich-Basel Plant Science Center University of ZürichWinterthurerstr.190CH-8057 ZürichSwitzerland Institute of Ecology Animal Ecology GroupLeuphana University LueneburgScharnhorststr.1D-21335 LünebourgGermany

Aims Plant diversity has been linked to both increasing and decreasing levels of arthropod herbivore damage in different plant *** far,these links have mainly been studied in grasslands or in artificial tree plantations with low species ***,most studies provide results from newly established experimental plant communities where trophic links are not fully established or from stands of tree saplings that have not yet developed a ***,we test how tree diversity in a species-rich subtropical forest in China with fully developed tree canopy affects levels of herbivore damage caused by different arthropod feeding *** We established 27 plots of 30×30 m *** plots were selected randomly but with the constraint that they had to span a large range of tree diversity as required for comparative studies in contrast to sample *** recorded herbivore damage caused by arthropod feeding guilds(leaf chewers,leaf skeletonizers and sap feeders)on canopy leaves of all major tree *** Findings Levels of herbivore damage increased with tree species richness and tree phylogenetic *** effects were most pronounced for damage caused by leaf *** the two diversity measures were highly correlated,we additionally found a significant interaction between them,whereby species richness increased herbivory mostly at low levels of phylogenetic *** species with the lowest proportion of canopy leaf biomass in a plot tended to suffer the highest levels of herbivore damage,which is in contrast to expectations based on the resource concentration *** results are in agreement with expectations of the dietary mixing hypothesis where generalist herbivores with a broad spectrum of food plants benefit from increased resource diversity in tree species-rich forest patches.

关键词： arthropod herbivore damage feeding guilds forest canopy generalist herbivores leaf biomass resource dilution specialist herbivores tree species richness tree phylogenetic diversity

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