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QTL mapping for leaf rust resistance in bread wheat using PBW343/W8627 RIL population.

K S Vindhya1, Renu Sharma1, Satish Kumar1

  • 1Indian Council of Agricultural Research (ICAR)-Indian Institute of Wheat and Barley Research, Karnal, India.

Frontiers in Plant Science
|July 16, 2026
PubMed
Summary

New quantitative trait loci (QTLs) for wheat leaf rust resistance were identified using a recombinant inbred line population. These findings offer valuable genetic resources for developing durable rust-resistant bread wheat cultivars.

Keywords:
DArTQTLsall stage resistance (ASR)bread wheatleaf rust

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Area of Science:

  • Plant Breeding and Genetics
  • Agronomy
  • Molecular Biology

Background:

  • Leaf rust, caused by *Puccinia triticina*, significantly reduces bread wheat yields (10-50%) due to evolving virulent pathotypes that overcome existing resistance genes.
  • Developing durable resistance is crucial for sustainable wheat production, necessitating the identification of novel genetic loci conferring resistance.

Purpose of the Study:

  • To map quantitative trait loci (QTLs) associated with leaf rust resistance in bread wheat at both seedling and adult plant stages.
  • To identify potential candidate genes for leaf rust resistance and their utility in breeding programs.

Main Methods:

  • A recombinant inbred line (RIL) population derived from a cross between PBW343 and W8627 was evaluated for leaf rust resistance over two crop seasons.
  • Genotyping of the RIL population was performed using 3.9K DArT SNPs for QTL mapping.
  • In silico analysis was conducted to identify putative candidate genes associated with mapped QTLs.

Main Results:

  • Significant differences in leaf rust resistance were observed among RILs across different years.
  • Two QTLs for all-stage resistance (*QLr.iiwbr.2B.1* on chromosome 2B and *QLr.iiwbr.5B.1* on chromosome 5B) and one QTL for adult plant resistance (*QLr.iiwbr.6B.1* on chromosome 6B) were identified.
  • A putative candidate gene encoding Annexin (*TraesCS5B02G201700*) was identified through in silico analysis, implicated in wheat disease resistance.

Conclusions:

  • The study successfully identified novel QTLs conferring resistance to wheat leaf rust, providing valuable genetic resources for breeding programs.
  • Further characterization of these QTLs and the candidate Annexin gene will enhance their application in developing durable rust-resistant wheat varieties.