Mapping of quantitative trait loci for resistance to race 1 of Pyrenophora triticiā€repentis in synthetic hexaploid wheat uri icon

abstract

  • Tan spot, caused by a necrotrophic fungus Pyrenophora tritici-repentis (Ptr), has become an important foliar disease of wheat worldwide. Effective control of tan spot can be achieved by deployment of resistant wheat cultivars. An F-2:3 population derived from a cross between synthetic hexaploid wheat (SHW), TA4161-L1 (moderately resistant) and susceptible winter wheat cultivar, TAM105' was evaluated with race 1 of Ptr under controlled conditions. The population was genotyped using Diversity Arrays Technology (DArT). Presence of transgressive segregants indicated contribution of positive alleles from both parents. Two major QTLs were located on the short arm of chromosomes 1A and 6A and designated as QTs.ksu-1A and QTs.ksu-6A, respectively. Two additional QTLs were identified on chromosome 7A. Resistant alleles of all the QTLs were contributed by TA4161-L1. Novel QTLs on 6A and 7A can be a valuable addition to known resistance genes and utilized in breeding programmes to produce highly resistant cultivars.

publication date

  • 2018
  • 2018