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- Title
<italic>Fusarium graminearum:</italic> pathogen or endophyte of North American grasses?
- Authors
Lofgren, Lotus A.; LeBlanc, Nicholas R.; Certano, Amanda K.; Nachtigall, Jonny; LaBine, Kathryn M.; Riddle, Jakob; Broz, Karen; Dong, Yanhong; Bethan, Bianca; Kafer, Christopher W.; Kistler, H. Corby
- Abstract
Summary: Mycotoxin‐producing <italic>Fusarium graminearum</italic> and related species cause Fusarium head blight on cultivated grasses, such as wheat and barley. However, these <italic>Fusarium</italic> species may have had a longer evolutionary history with North American grasses than with cultivated crops and may interact with the ancestral hosts in ways which are biochemically distinct. We assayed 25 species of asymptomatic native grasses for the presence of <italic>Fusarium</italic> species and confirmed infected grasses as hosts using re‐inoculation tests. We examined seed from native grasses for the presence of mycotoxin‐producing <italic>Fusarium</italic> species and evaluated the ability of these fungi to produce mycotoxins in both native grass and wheat hosts using biochemical analysis. Mycotoxin‐producing <italic>Fusarium</italic> species were shown to be prevalent in phylogenetically diverse native grasses, colonizing multiple tissue types, including seeds, leaves and inflorescence structures. Artificially inoculated grasses accumulated trichothecenes to a much lesser extent than wheat, and naturally infected grasses showed little to no accumulation. Native North American grasses are commonly inhabited by <italic>Fusarium</italic> species, but appear to accommodate these toxigenic fungi differently from cultivated crops. This finding highlights how host identity and evolutionary history may influence the outcome of plant–fungal interactions and may inform future efforts in crop improvement.
- Subjects
FUSARIUM; OOMYCETES; ENDOPHYTES; PHYLOGENY; BIOCHEMISTRY
- Publication
New Phytologist, 2018, Vol 217, Issue 3, p1203
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.14894