Identification and validation of a major QTL on chromosome 2A for wheat-<i>Parastagonospora nodorum</i> interactions.

ABSTRACT: Wheat (Triticum aestivum L.) is frequently affected by Septoria nodorum blotch (SNB), a fungal disease that significantly reduces wheat yields. In this study, two recombinant inbred line (RIL) populations, developed from crosses involving two elite CIMMYT breeding lines (WUYA and KATH) and a common susceptible male parent (CIANO T79), were used to detect quantitative trait loci (QTL) associated with SNB resistance. High-density genetic maps were constructed for these RIL populations by incorporating presence/absence variation (PAV) markers using the DArTseq genotyping platform. Three major and stable QTL linked to SNB resistance were identified on chromosomes 2A, 4B, and 5B. Among these, QSnb.cim-2A accounted for 22.16%-28.74% and 17.62%-19.71% of the phenotypic variation in

SUBMITTER: Li C 

PROVIDER: S-EPMC12457223 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature