Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 11/1/2009
Publication Date: 11/1/2009
Citation: Faroud, N.A., Mccormick, S.P., Macmillan, T., Ellis, B.E., Kendra, D.F., Eudes, F. 2009. Trichothecene-Genotypes Play a Role in Fusarium Head Blight Disease Spread and Trichothecene Accumulation in Wheat [abstract]. Canadian Workshop on Fusarium Head Blight. Interpretive Summary:
Technical Abstract: In the current study, we evaluated the impact of the observed North American evolutionary shift in the Fusarium graminearum complex on disease spread, kernel damage, and trichothecene accumulation in resistant and susceptible wheat genotypes. Four inocula were prepared using composites of F. graminearum strains with either 3-ADON (Fg3ADON), 15-ADON (Fg15ADONa and Fg15ADONß), or NIV (FgNIV) genotypes. Isolates used in Fg15ADONß are believed to be related to the 3-ADON population, and some of these strains have been shown to produce higher levels of DON than those used in 15-ADONa. Stable resistance or susceptibility to disease spread, as well as Fusarium-damaged kernel (FDK) scores, were observed in highly-resistant or highly-susceptible wheat genotypes. Trichothecene-genotype dependent interactions in disease spread and FDK were observed in moderate or intermediate sources of resistance/susceptibility: susceptibility to disease spread increased in wheat infected with Fg3ADON or Fg15ADONß, and decreased in wheat infected with FgNIV. Unexpectedly, the amount of FDK and trichothecene observed in the grain were lowest in Fg3ADON- and FgNIV-infected wheat, even though Fg3ADON was much more aggressive than FgNIV. Our results indicate trichothecene-genotypes differ in their aggressiveness to colonize wheat tissues, which is supported by earlier reports identifying trichothecenes as an aggressiveness factor.