Abstract

Stripe rust is one of the most devastating foliar disease of wheat throughout the world. The identification of new adult plant resistance loci is one of the best strategies to overcome the huge losses caused by stripe rust in many regions of the world. Wheat landraces possess untapped genetic resources for both abiotic and biotic stresses including diseases like stripe rust. This study was conducted to identify the genetic basis of adult plant resistance response in bread wheat landrace BWLR-2347 conserved at ICARDA gene bank. The mapping population of 178 F2 individuals was genotyped with high quality genotype-by-sequencing derived SNPs. The phenotypic disease assessment was carried out in F2:3 families derived from the cross between resistant bread wheat landrace BWLR-2347 and susceptible Avocet “S” in the field under artificial inoculation with a mixture of stripe rust races. A total of seven QTL were identified for resistance to YR at the adult plant growth stage and were mapped on five chromosomes. The QTL’s were detected on 1B, 2A, 2B, 2D, and 5A region. The phenotypic variance explained by an individual QTL ranged from 2.01% to 5.59%. The study validated the six previously identified QTL and reported a novel QTL at chromosome 5A. The information obtained from the study will be helpful in wheat breeding programs towards the development of stripe rust resistant cultivars.

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