Specific Resistance Genes in Wheat Chinese Landrace ‘Wangshuibai’ against Two Iranian Mycosphaerella graminicola Isolates

Abstract

Septoria tritici blotch, caused by the fungus Mycosphaerella graminicola, is currently the major foliar disease ofwheat world-wide, and new sources of resistance and knowledge about the genetics of resistance are needed toimprove breeding for resistance against this disease. An F10 recombinant inbred population from a cross between‘Wangshuibai’ (Chinese landrace) and the susceptible cultivar ‘Seri82’ was tested at seedling stage undercontrolled greenhouse conditions. Two isolate-specific genes for resistance to Iranian M.graminicola isolatesIPO08002 and IPO08003 were detected on Chromosomes 2BL and 7DS, respectively. For both genes theresistance was derived from ‘Wangshuibai’ at positions where Stb9 (on 2BL) and Stb4 (on 7DS) have been reported previously. These two genes are closely linked to microsatellite markers, which can be used formarker-assisted selection. ‘Wangshuibai’ may therefore be a valuable source of resistance to STB for wheatbreeding, especially in Mediterranean environments.