title: Contrasting Roles of Deoxynivalenol and Nivalenol in Host-Mediated Interactions between Fusarium graminearum and Sitobion avenae.
abstract: Fusarium graminearumis the predominant causal species of Fusarium head blight in Europe and North America. Different chemotypes of the species exist, each producing a plethora of mycotoxins. Isolates of differing chemotypes produce nivalenol (NIV) and deoxynivalenol (DON), which differ in toxicity to mammals and plants. However, the effect of each mycotoxin on volatile emissions of plant hosts is not known. Host volatiles are interpreted by insect herbivores such asSitobion avenae, the English grain aphid, during host selection. Previous work has shown that grain aphids are repelled by wheat infected with DON-producingF. graminearum, and this study seeks to determine the influence of pathogen mycotoxins to host volatile chemistry. Volatile collections from infected hosts and olfactometer bioassays with alate aphids were performed. Infections with isolates that produced DON and NIV were compared, as well as a trichothecene deficient transformant derived from the NIV-producing isolate. This work confirmed the repellent nature of infected hosts with DON accumulation. NIV accumulation produced volatiles that were attractive to aphids. Attraction did not occur when NIV was absent and was, therefore, a direct consequence of NIV production.
authors.affiliation: Division of Plant and Crop Sciences, University of Nottingham, Sutton Bonington Campus, College Rd., Sutton Bonington LE12 5RD, UK. jassydrak@gmail.com.
authors.forename: Jassy
authors.initials: J
authors.lastname: Drakulic
authors.affiliation: Division of Plant and Crop Sciences, University of Nottingham, Sutton Bonington Campus, College Rd., Sutton Bonington LE12 5RD, UK. mhaziq79@gmail.com.
authors.forename: Mohd Haziq
authors.initials: MH
authors.lastname: Kahar
authors.affiliation: Division of Plant and Crop Sciences, University of Nottingham, Sutton Bonington Campus, College Rd., Sutton Bonington LE12 5RD, UK. bukky.ajigboye@nottingham.ac.uk.
authors.forename: Olubukola
authors.initials: O
authors.lastname: Ajigboye
authors.affiliation: Biological Chemistry and Crop Protection, Rothamsted Research, Harpenden Herts AL5 2JQ, UK. toby.bruce@rothamsted.ac.uk.
authors.forename: Toby
authors.initials: T
authors.lastname: Bruce
authors.affiliation: Division of Plant and Crop Sciences, University of Nottingham, Sutton Bonington Campus, College Rd., Sutton Bonington LE12 5RD, UK. rumiana.ray@nottingham.ac.uk.
authors.forename: Rumiana V
authors.initials: RV
authors.lastname: Ray
mesh_terms: D000818:Animals; D001042:Aphids / Q000502:physiology*; D001522:Behavior, Animal; D005670:Fusarium / Q000378:metabolism / Q000502:physiology*; D054884:Host-Pathogen Interactions; D010935:Plant Diseases / Q000382:microbiology; D014255:Trichothecenes / Q000378:metabolism*; D014908:Triticum / Q000382:microbiology / Q000469:parasitology
chemical_list: D014255:Trichothecenes; C038405:nivalenol; C007262:deoxynivalenol
keywords: Fusarium head blight; aphids; deoxynivalenol; nivalenol; trichothecenes; volatiles