Contrasting Roles of Deoxynivalenol and Nivalenol in Host-Mediated Interactions between Fusarium graminearum and Sitobion avenae

Toxins

Toby Bruce¹  Jassy Drakulic²  Mohd Haziq Kahar²  Rumiana V. Ray²  Olubukola Ajigboye² 

[1] Biological Chemistry and Crop Protection, Rothamsted Research, Harpenden Herts AL5 2JQ, UK;Division of Plant and Crop Sciences, University of Nottingham, Sutton Bonington Campus, College Rd., Sutton Bonington LE12 5RD, UK;

关键词: deoxynivalenol;    nivalenol;    trichothecenes;    Fusarium head blight;    aphids;    volatiles;   

DOI  :  10.3390/toxins8120353

来源: DOAJ

【 摘 要 】

Fusarium graminearum is 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 as Sitobion avenae, the English grain aphid, during host selection. Previous work has shown that grain aphids are repelled by wheat infected with DON-producing F. 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.

【 授权许可】

Unknown