Meta-QTL for resistance to white mold in common bean

PLoS One. 2017 Feb 15;12(2):e0171685. doi: 10.1371/journal.pone.0171685. eCollection 2017.

Abstract

White mold, caused by the fungus Sclerotinia sclerotiorum (Lib.) de Bary, is a major disease that limits common bean production and quality worldwide. The host-pathogen interaction is complex, with partial resistance in the host inherited as a quantitative trait with low to moderate heritability. Our objective was to identify meta-QTL conditioning partial resistance to white mold from individual QTL identified across multiple populations and environments. The physical positions for 37 individual QTL were identified across 14 recombinant inbred bi-parental populations (six new, three re-genotyped, and five from the literature). A meta-QTL analysis of the 37 QTL was conducted using the genetic linkage map of Stampede x Red Hawk population as the reference. The 37 QTL condensed into 17 named loci (12 previously named and five new) of which nine were defined as meta-QTL WM1.1, WM2.2, WM3.1, WM5.4, WM6.2, WM7.1, WM7.4, WM7.5, and WM8.3. The nine meta-QTL had confidence intervals ranging from 0.65 to 9.41 Mb. Candidate genes shown to express under S. sclerotiorum infection in other studies, including cell wall receptor kinase, COI1, ethylene responsive transcription factor, peroxidase, and MYB transcription factor, were found within the confidence interval for five of the meta-QTL. The nine meta-QTL are recommended as potential targets for MAS for partial resistance to white mold in common bean.

MeSH terms

  • Ascomycota / genetics*
  • Chromosome Mapping
  • Chromosomes, Plant / chemistry
  • Chromosomes, Plant / genetics
  • Disease Resistance / genetics*
  • Genetic Linkage
  • Genotype
  • Peroxidase / genetics
  • Peroxidase / metabolism
  • Phaseolus / genetics*
  • Phaseolus / microbiology
  • Plant Diseases / genetics
  • Plant Diseases / microbiology
  • Plant Proteins / genetics
  • Plant Proteins / metabolism
  • Polymorphism, Single Nucleotide
  • Quantitative Trait Loci*
  • Transcription Factors / genetics
  • Transcription Factors / metabolism

Substances

  • Plant Proteins
  • Transcription Factors
  • Peroxidase

Grants and funding

RV received support from CAPES (Brazilian Federal Agency for Support and Evaluation of Graduate Education (BEX 10615/14-8) [www.iie.org/programs/capes]. PNM JM PM appreciate funding from the USDA-ARS National Sclerotinia Initiative [https://www.ars.usda.gov/plains-area/docs/white-mold-research/research/]. PM QS appreciate funding from the USDA, National Institute of Food and Agricultural (NIFA), Agriculture and Food Research Initiative (AFRI), Project #2009-0192. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.