title: Potato virus Y infection hinders potato defence response and renders plants more vulnerable to Colorado potato beetle attack.
abstract: In the field, plants are challenged by more than one biotic stressor at the same time. In this study, the molecular interactions between potato (Solanum tuberosum L.), Colorado potato beetle (Leptinotarsa decemlineata Say; CPB) and Potato virus Y(NTN) (PVY(NTN) ) were investigated through analyses of gene expression in the potato leaves and the gut of the CPB larvae, and of the release of potato volatile compounds. CPB larval growth was enhanced when reared on secondary PVY(NTN) -infected plants, which was linked to decreased accumulation of transcripts associated with the antinutritional properties of potato. In PVY(NTN) -infected plants, ethylene signalling pathway induction and induction of auxin response transcription factors were attenuated, while no differences were observed in jasmonic acid (JA) signalling pathway. Similarly to rearing on virus-infected plants, CPB larvae gained more weight when reared on plants silenced in JA receptor gene (coi1). Although herbivore-induced defence mechanism is regulated predominantly by JA, response in coi1-silenced plants only partially corresponded to the one observed in PVY(NTN) -infected plants, confirming the role of other plant hormones in modulating this response. The release of β-barbatene and benzyl alcohol was different in healthy and PVY(NTN) -infected plants before CPB larvae infestation, implicating the importance of PVY(NTN) infection in plant communication with its environment. This was reflected in gene expression profiles of neighbouring plants showing different degree of defence response. This study thus contributes to our understanding of plant responses in agro-ecosystems.
authors.affiliation: Department of Biotechnology and Systems Biology, National Institute of Biology, Večna pot 111, 1000, Ljubljana, Slovenia.
authors.forename: Marko
authors.initials: M
authors.lastname: Petek
authors.forename: Ana
authors.initials: A
authors.lastname: Rotter
authors.forename: Polona
authors.initials: P
authors.lastname: Kogovšek
authors.forename: Spela
authors.initials: S
authors.lastname: Baebler
authors.forename: Axel
authors.initials: A
authors.lastname: Mithöfer
authors.forename: Kristina
authors.initials: K
authors.lastname: Gruden
mesh_terms: D000818:Animals; D001517:Coleoptera / Q000254:growth & development*; D003517:Cyclopentanes / Q000378:metabolism; D005030:Ethylenes / Q000378:metabolism; D060434:Herbivory; D054884:Host-Pathogen Interactions; D007210:Indoleacetic Acids / Q000378:metabolism; D007814:Larva / Q000254:growth & development; D008969:Molecular Sequence Data; D054883:Oxylipins / Q000378:metabolism; D010935:Plant Diseases / Q000235:genetics; D010937:Plant Growth Regulators / Q000378:metabolism; D017800:Potyvirus; D015398:Signal Transduction; D011198:Solanum tuberosum / Q000235:genetics* / Q000821:virology*; D059467:Transcriptome; D055549:Volatile Organic Compounds / Q000302:isolation & purification
chemical_list: D003517:Cyclopentanes; D005030:Ethylenes; D007210:Indoleacetic Acids; D054883:Oxylipins; D010937:Plant Growth Regulators; D055549:Volatile Organic Compounds; C011006:jasmonic acid; C036216:ethylene
keywords: Leptinotarsa decemlineata; Solanum tuberosum (potato); gene expression; insect midgut transcriptional response; plant defence; volatile organic compounds