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Background  Mutation of Arabidopsis  DMR1 , encoding homoserine kinase, leads to elevation in homoserine and foliar resistance to the biotrophic pathogens  Hyaloperonospora arabidopsidis  and  Oidium neolycopersici  through activation of an unidentified defence mechanism. This study investigates the effect of mutation of  dmr1  on resistance to the ascomycete pathogens  Fusarium graminearum  and  F. culmorum , which cause Fusarium Ear Blight (FEB) disease on small grain cereals.    Results  We initially found that the  dmr1 - 2  mutant allele confers increased resistance to  F. culmorum  and  F. graminearum  silique infection, and decreased colonisation of rosette leaves. Meanwhile the  dmr1 - 1  allele supports less rosette leaf colonisation but has wild type silique resistance. Three additional  dmr1  alleles were subsequently examined for altered  F. culmorum  susceptibility and all showed increased silique resistance, while leaf colonisation was reduced in two ( dmr1 - 3  and  dmr1 - 4 ). Amino acid analysis of  dmr1  siliques revealed homoserine accumulation, which is undetectable in wild type plants. Exogenous application of L-homoserine reduced bud infection in both  dmr1  and wild type plants, whilst D-homoserine application did not. Delayed leaf senescence was also observed in  dmr1  plants compared to wild type and correlated with reduced  Fusarium  leaf colonisation.    Conclusions  These findings suggest that common Arabidopsis  DMR1  mediated susceptibility mechanisms occur during infection by both obligate biotrophic oomycete and hemi-biotrophic fungal pathogens, not only in vegetative but also in reproductive plant tissues. This has the potential to aid the development of cereal crops with enhanced resistance to FEB.    Electronic supplementary material  The online version of this article (doi:10.1186/s12870-014-0317-0) contains supplementary material, which is available to authorized users.

Mutations in the Arabidopsis homoserine kinase gene DMR1 confer enhanced resistance to Fusarium culmorum and F. graminearum