title: Tomato yellow leaf curl virus differentially influences plant defence responses to a vector and a non-vector herbivore.
abstract: Plants frequently engage in simultaneous interactions with diverse classes of biotic antagonists. Differential induction of plant defence pathways by these antagonists, and interactions between pathways, can have important ecological implications; however, these effects are currently not well understood. We explored how Tomato yellow leaf curl virus (TYLCV) influenced the performance of its vector (Bemisia tabaci) and a non-vector herbivore (Tetranychus urticae) occurring separately or together on tomato plants (Solanum lycopersicum). TYLCV enhanced the performance of B. tabaci, although this effect was statistically significant only in the absence of T. urticae, which adversely affected B. tabaci performance regardless of infection status. In contrast, the performance of T. urticae was enhanced (only) by the combined presence of TYLCV and B. tabaci. Analyses of phytohormone levels and defence gene expression in wild-type tomatoes and various plant-defence mutants indicate that the enhancement of herbivore performance (for each species) entails the disruption of downstream defences in the jasmonic acid (JA) pathway. For T. urticae, this disruption appears to involve antagonistic effects of salicylic acid (SA), which is cumulatively induced to high levels by B. tabaci and TYLCV. In contrast, TYLCV was found to suppress JA-mediated responses to B. tabaci via mechanisms independent of SA.
authors.affiliation: College of Agriculture, Yangtze University, Jingzhou, Hubei, 434025, China.|Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Su
authors.affiliation: Department of Environmental Systems Science, ETH Zürich, Zürich, 8092, Switzerland.
authors.forename: Mark C
authors.initials: MC
authors.lastname: Mescher
authors.affiliation: Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
authors.forename: Shaoli
authors.initials: S
authors.lastname: Wang
authors.affiliation: Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
authors.forename: Gong
authors.initials: G
authors.lastname: Chen
authors.affiliation: Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Xie
authors.affiliation: Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
authors.forename: Qingjun
authors.initials: Q
authors.lastname: Wu
authors.affiliation: College of Agriculture, Yangtze University, Jingzhou, Hubei, 434025, China.
authors.forename: Wenkai
authors.initials: W
authors.lastname: Wang
authors.affiliation: Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
authors.forename: Youjun
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000818:Animals; D053839:Begomovirus / Q000502:physiology*; D003517:Cyclopentanes; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D006430:Hemiptera / Q000254:growth & development / Q000502:physiology*; D060434:Herbivory / Q000502:physiology*; D007303:Insect Vectors / Q000821:virology*; D018551:Solanum lycopersicum / Q000235:genetics / Q000276:immunology* / Q000821:virology*; D054883:Oxylipins; D010935:Plant Diseases / Q000821:virology; D010937:Plant Growth Regulators / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D040102:Tetranychidae / Q000502:physiology*
chemical_list: D003517:Cyclopentanes; D054883:Oxylipins; D010937:Plant Growth Regulators; D012333:RNA, Messenger; C011006:jasmonic acid
keywords: Bemisia tabaci; Tetranychus urticae; Tomato yellow leaf curl virus; community ecology; defence suppression; induced plant defence; plant-mediated indirect interactions; virus-plant-herbivore interactions