Postulation of Resistant Genes for Powdery Mildew (blumeria Graminis Tritici) in Indian Wheats

Two hundred and sixty three genotypes of advanced Indian wheat breeding material comprising Triticum spp. and tritcale were screened against seven genetically characterized virulences of Blumeria graminis f. sp. tritici and powdery mildew resistant genes were postulated in fifty one genotypes showing differential reaction to the cultures. Gene Pm5 and some other unidentified gene(s) were postulated in genotype PBW 368. Resistance in genotypes PBW 363 was attributed to gene (s) Pm3c+Pm8 and some other unidentified gene (s). Resistance in these genotypes, HS 352, HS 365, HPW 93, HUW 435, UP 2359, HP 1740, UP 2358, HW 1089, K 9210, K 9211, K 9116, K 9235, K 9228, HUW 443, WH 615, HUW 446, HD 2644, MP 941, HUW 435, HUW 454, HW 1087, PBW 369 and HP 1729 was found to be controlled by gene Pm8 individually or in combination with unknown gene(s). Resistance in 24 genotypes, behaving differentially to the cultures, could not be attributed to any of the known gene(s). Eight genotypes UP 2374, PBW 361, HW 1093, UP 2375, TL 2853, TL 2780, HPT 6 and DT 46 were resistant to all the test cultures, hence, the resistance in these genotypes could not be attributed to any of the genotypes. Rest of the genotypes were susceptible to all the isolates.