Molecular characterization of Fusarium resistance from Elymus repens introgressed into bread wheat

Resumo

A cross was made of Elymus repens onto the wheat cultivar Crocus and BC₁ progeny advanced to BC₁F₇ by single seed descent. Sixteen lines were selected based on agronomic performance and evaluated in an FHB epiphytotic nursery. Eight lines with FHB resistance were selected. Based on GISH analysis, line PI 142-3-1-5 had 42 chromosomes with one pair of chromosomes showing telomeric translocations on both arms. This chromosome was identified as 3D by using SSR markers. An evaluation of lines with single translocations revealed that FHB resistance was contributed by the translocation on the long arm of chromosome 3D. That line has minimal linkage drag and should be amenable to applications inbreeding for disease resistance.