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Sequence-Based Introgression Mapping Identifies Candidate White Mold Tolerance Genes in Common Bean.

Sujan Mamidi, Phillip N Miklas, Jennifer Trapp

The Plant Genome

|November 30, 2016

Summary

This summary is machine-generated.

Researchers identified two key genetic regions, WM7.1 and WM8.3, that enhance common bean tolerance to white mold disease. This finding aids in developing disease-resistant bean varieties.

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A Simple Method for Isolation of Soybean Protoplasts and Application to Transient Gene Expression Analyses

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Area of Science:

Plant Pathology
Genetics
Molecular Biology

Background:

White mold, caused by the necrotrophic fungus *Sclerotinia sclerotiorum*, is a significant disease affecting common bean (*Phaseolus vulgaris* L.).
Quantitative trait loci (QTL) WM7.1 and WM8.3 have been identified as major contributors to common bean's tolerance to white mold.

Purpose of the Study:

To fine-map and confirm the genetic locations of the WM7.1 and WM8.3 QTL in common bean.
To identify candidate genes within these QTL intervals associated with white mold tolerance.

Main Methods:

Utilized advanced backcross and recombinant inbred (RI) populations for QTL fine mapping.
Employed physical mapping with the common bean genome sequence and sequence-based introgression mapping.
Analyzed whole-genome sequence data from susceptible and tolerant DNA pools to identify introgressed regions using single-nucleotide polymorphisms (SNPs).

Main Results:

WM7.1 was localized to a 660-kb region on chromosome Pv07 containing 41 gene models.
WM8.3 was narrowed to a 1.36-Mb region with 70 gene models.
Identified a BEACH-domain protein gene within WM7.1 and a receptor-like protein gene within WM8.3 as strong candidates based on polymorphism and putative function.

Conclusions:

Fine mapping and sequence-based approaches successfully narrowed down the genetic intervals for WM7.1 and WM8.3.
Two candidate genes, a BEACH-domain protein and a receptor-like protein, were identified with functions potentially related to white mold resistance mechanisms in common bean.