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Background   Stagonospora nodorum  blotch (SNB), Fusarium head blight (FHB) and stem rust (SR), caused by the fungi  Parastagonospora  (synonym  Stagonospora )  nodorum, Fusarium graminearum  and  Puccinia graminis , respectively, significantly reduce yield and quality of wheat. Three resistance factors,  QSng.sfr - 3BS ,  Fhb1  and  Sr2 , conferring resistance, respectively, to SNB, FHB and SR, each from a unique donor line, were mapped previously to the short arm of wheat chromosome 3B. Based on published reports, our hypothesis was that  Sr2  is the most distal,  Fhb1  the most proximal and  QSng.sfr - 3BS  is in between  Sr2  and  Fhb1  on wheat chromosome arm 3BS.    Results  To test this hypothesis, 1600 F 2  plants from crosses between parental lines Arina, Alsen and Ocoroni86, conferring resistance genes  QSng.sfr - 3BS ,  Fhb1  and  Sr2,  respectively, were genotyped and phenotyped for SNB along with the parental lines. Five closely linked single-nucleotide polymorphism (SNP) markers were used to make the genetic map and determine the gene order.    Conclusions  The results indicate that  QSng.sfr - 3BS  is located between the other two resistance genes on chromosome 3BS. Knowing the positional order of these resistance genes will aid in developing a wheat line with all three genes in coupling, which has the potential to provide broad-spectrum resistance preventing grain yield and quality losses.

Determining the order of resistance genes against Stagonospora nodorum blotch, Fusarium head blight and stem rust on wheat chromosome arm 3BS