Genome-Wide Linkage Mapping of QTL for Adult-Plant Resistance to Stripe Rust in a Chinese Wheat Population Linmai 2 × Zhong 892

PLoS One. 2015 Dec 29;10(12):e0145462. doi: 10.1371/journal.pone.0145462. eCollection 2015.

Abstract

Stripe rust is one of the most devastating diseases of wheat (Triticum aestivum) worldwide. Adult-plant resistance (APR) is an efficient approach to provide long-term protection of wheat from the disease. The Chinese winter wheat cultivar Zhong 892 has a moderate level of APR to stripe rust in the field. To determine the inheritance of the APR resistance in this cultivar, 273 F6 recombinant inbred lines (RILs) were developed from a cross between Linmai 2 and Zhong 892. The RILs were evaluated for maximum disease severity (MDS) in two sites during the 2011-2012, 2012-2013 and 2013-2014 cropping seasons, providing data for five environments. Illumina 90k SNP (single nucleotide polymorphism) chips were used to genotype the RILs and their parents. Composite interval mapping (CIM) detected eight QTL, namely QYr.caas-2AL, QYr.caas-2BL.3, QYr.caas-3AS, QYr.caas-3BS, QYr.caas-5DL, QYr.caas-6AL, QYr.caas-7AL and QYr.caas-7DS.1, respectively. All except QYr.caas-2BL.3 resistance alleles were contributed by Zhong 892. QYr.caas-3AS and QYr.caas-3BS conferred stable resistance to stripe rust in all environments, explaining 6.2-17.4% and 5.0-11.5% of the phenotypic variances, respectively. The genome scan of SNP sequences tightly linked to QTL for APR against annotated proteins in wheat and related cereals genomes identified two candidate genes (autophagy-related gene and disease resistance gene RGA1), significantly associated with stripe rust resistance. These QTL and their closely linked SNP markers, in combination with kompetitive allele specific PCR (KASP) technology, are potentially useful for improving stripe rust resistances in wheat breeding.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Chromosome Mapping*
  • Disease Resistance / genetics*
  • Genetic Markers / genetics
  • Genome, Plant / genetics
  • Genomics*
  • Phenotype
  • Plant Breeding*
  • Plant Diseases / immunology*
  • Polymorphism, Single Nucleotide
  • Quantitative Trait Loci / genetics*
  • Triticum / genetics*
  • Triticum / immunology

Substances

  • Genetic Markers

Grants and funding

This study was supported by the National Key Basic Research Program of China (2013CB127700), National Natural Science Foundation of China (31261140370), International Collaboration Projects from the Ministry of Science and Technology (2011DFG32990, 2013DFG30530) and Ministry of Agriculture (2011-G3), National 863 Project (2012AA101105), and the China Agricultural Research System (CARS-3-1-3). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.