Nonhost Resistance of Thinopyrum ponticum to Puccinia graminis f. sp. tritici and the Effects of the Sr24, Sr25, and Sr26 Genes Introgressed to Wheat

The damage to wheat crops by stem rust poses a threat the food security of world’s population. species Thinopyrum ponticum (Podpěra, 1902) (Z.-W. Liu and R.-C. Wang, 1993) is non-host for fungus Puccinia graminis f. sp. tritici Eriks. Henn. (Pgt). Sr24, Sr25, Sr26 genes, transferred from Th. gene pool, protect cultivars disease in different regions world. study resistance (NHR) effects introgressed genes important breeding with durable rust. aim research interaction Pgt common lines addition determining role ROS resistance. Wheat were resistant West Siberian Using cytological methods, it was found that NHR led inhibition most inoculumdevelopment on plant surface. This mainly due suppression appressoria development their death at stage penetration into stomata. Upon contact stomatal guard cells, generation superoxide anion O2•− revealed. similar immunity Arabidopsis thaliana non-pathogenic bacteria. results our studies show reproduce action some mechanisms wheat.