Fusarium Head Blight is a disease of cereal crops that causes severe yield losses and mycotoxin contamination of grain. The main causal pathogen, Fusarium graminearum, produces the trichothecene toxins deoxynivalenol or nivalenol as virulence factors. Nivalenol-producing isolates are most prevalent in Asia but co-exist with deoxynivalenol producers in lower frequency in North America and Europe. Previous studies identified a barley UDP-glucosyltransferase, HvUGT13248, that efficiently detoxifies deoxynivalenol, and when expressed in transgenic wheat results in high levels of type II resistance against deoxynivalenol-producing F. graminearum. Here we show that HvUGT13248 is also capable of converting nivalenol into the non-Toxic nivalenol-3-O-β-d-glucoside. We describe the enzymatic preparation of a nivalenol-glucoside standard and its use in development of an analytical method to detect the nivalenol-glucoside conjugate. Recombinant Escherichia coli expressing HvUGT13248 glycosylates nivalenol more efficiently than deoxynivalenol. Overexpression in yeast, Arabidopsis thaliana, and wheat leads to increased nivalenol resistance. Increased ability to convert nivalenol to nivalenol-glucoside was observed in transgenic wheat, which also exhibits type II resistance to a nivalenol-producing F. graminearum strain. Our results demonstrate the HvUGT13248 can act to detoxify deoxynivalenol and nivalenol and provide resistance to deoxynivalenol-And nivalenol-producing Fusarium.
Bibliographical noteFunding Information:
This material is based upon work supported by the US Department of Agriculture, under Agreement no. 59-0206-4-021. This is a co-operative project with the US Wheat and Barley Scab Initiative. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the view of the US Department of Agriculture. The work performed in Austria was funded by the FWF special research project Fusarium (F3708, F3706, F3711, and F3715) and the Vienna Science and Technology Fund (LS12-021). Furthermore, we thank the Austrian Federal Ministry of Science, Research and Economy, the Austrian National Foundation of Research, Technology and Development, as well as the BIOMIN Holding GmbH for funding the Christian Doppler Laboratory for Mycotoxin Metabolism. We also thank H. Corby Kistler for the NIV-producing Fusarium graminearum strain
© The Author 2017.
- Fusarium graminearum
- Fusarium head blight