Localization of the powdery mildew resistance gene Pm07J126 in wheat ( Triticum aestivum L.)

Powdery mildew (Pm), caused by Blumeria graminis f. sp. tritici ( Bgt ), is one of the most serious diseases of common wheat ( Triticum aestivum L.) in many regions of the world. Rapid loss of resistance caused by pathogen virulence requires continual improvement of Pm resistance through utilization of novel resistance genes. Pm07J126 , in wheat line 07jian126, is a dominant resistance gene, conferring immunity to the prevailing Bgt population in Sichuan province. Previous studies showed that Pm07J126 might be derived from rye ( Secale cereale L.) and that it was closely linked with SSR marker barc183 . In this study, we localized Pm07J126 to the distal end of chromosome 6DS based on markers barc183 and cfd135 . Collinearity analysis of wheat, Brachypodium and rice helped to identify an sequence tagged site marker in close proximity to barc183 in chromosome bin 6DS6-0.99-1.00. Marker Xcib9 that co-segregated with Pm07J126 should be useful for marker-assisted selection in wheat breeding programs.