Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/22/2009
Publication Date: 3/22/2009
Citation: Yli-Mattila, T., Gagkaeva, T., Ward, T.J., Aoki, T., Kistler, H.C., O Donnell, K. 2009. A novel Asian clade within the Fusarium graminearum species complex includes a newly discovered cereal head blight pathogen from the Far East of Russia. Meeting Abstract.
Technical Abstract: A multilocus genotyping (MLGT) assay revealed significant differences in the geographic distribution of 3ADON and 15ADON chemotypes of F. graminearum in Europe. While 93.5% of the isolates in southern Russia (N = 43 of 46) possessed the 15ADON chemotype, isolates in Finland and north-western Russia (N = 40) were exclusively 3ADON-producers during the years 1986-2006. In north-western Russia F. graminearum was not found until in 2003. All 27 F. culmorum isolates possessed the 3ADON chemotype, whereas all six isolates of F. cerealis possessed the NIV chemotype. In the Russian Far East (114 isolates) the 3ADON chemotype frequency increased between the years 1998-2006, and could reflect a shift in trichothecene chemotype composition similar to that observed within North America. However, additional sampling is required to confirm this observation. In addition, MLGT and phylogenetic analyses of multilocus DNA sequence data identified ten isolates from the Far East of Russia as a novel species, F. ussurianum, which together with F. vorosii and F. asiaticum, form a newly discovered Asian clade within the F. graminearum species complex. Pathogenicity to wheat and trichothecene toxin potential of the new species was also determined.