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Background   Fusarium graminearum  sensu stricto (s.s.) is an ubiquitous pathogen of cereals. The economic impact of Fusarium head blight (FHB) is characterized by crop losses and mycotoxin contamination. Our objective was to associate SNP diversity within candidate genes with phenotypic traits. A total of 77  F. graminearum  s.s. isolates was tested for severity of fungal infection (= aggressiveness) and deoxynivalenol (DON) production in an inoculated field experiment at two locations in each of two years. For seven genes known to control fungal growth ( MetAP1, Erf2 ) or DON production ( TRI1, TRI5, TRI6 TRI10  and  TRI14 ) single nucleotides polymorphic sites (SNPs) were determined and evaluated for the extent of linkage disequilibrium (LD). Associations of SNPs with both phenotypic traits were tested using linear mixed models.    Results  Decay of LD was in most instances fast. Two neighboring SNPs in  MetAP1  and one SNP in  Erf2  were significantly ( P  < 0.05) associated with aggressiveness explaining proportions of genotypic variance ( p G  ) of 25.6%, 0.5%, and 13.1%, respectively. One SNP in  TRI1  was significantly associated with DON production ( p G   = 4.4).    Conclusions  We argue that using the published sequence information of  Fusarium graminearum  as a template to amplify comparative sequence parts of candidate genes is an effective method to detect quantitative trait loci. Our findings underline the potential of candidate gene association mapping approaches to identify functional SNPs underlying aggressiveness and DON production for  F. graminearum  s.s populations.

bmc genomic data

Association of single nucleotide polymorphic sites in candidate genes with aggressiveness and deoxynivalenol production in Fusarium graminearum causing wheat head blight