|Cuperlovic-culf, Miroslave - National Research Council - Canada|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 12/6/2016
Publication Date: N/A
Technical Abstract: Fusarium head blight (FHB) is one of the world’s most devastating wheat diseases, and results in significant yield loss and contamination of grain with harmful mycotoxins called trichothecenes. Despite emerging risks of increased mycotoxin contamination in food and feed associated with climate change, little is known about how rising [CO2] will influence natural wheat resistance mechanisms against Fusarium graminearum, the primary etiological agent of FHB. In this study the defense response of wheat plants grown at ambient (400 ppm) [CO2] and elevated (800 ppm) [CO2] was evaluated and compared. The timing and magnitude of the phytohormone defense response was different at elevated [CO2]. Additionally, pathogenesis-related (PR) and lipoxygenase (LOX) gene transcript levels and metabolite concentrations were altered. Our results suggest that elevated [CO2] reconfigures the defense response of wheat leading to changes in susceptibility to FHB and mycotoxin contamination.