Multi-locus genome-wide association study on the rheological traits in wheat flour dough

Area of Science:

• Agricultural Science
• Genetics
• Food Science

Background:

• Wheat dough rheology is crucial for baking and food quality.
• Previous genetic studies on rheological traits have limitations, necessitating identification of stable genetic loci.
• Multi-locus genome-wide association studies (ML-GWAS) are vital for understanding complex traits like dough rheology.

Purpose of the Study:

• To identify stable genetic loci and candidate genes associated with wheat flour dough rheological properties.
• To leverage multi-locus genome-wide association studies (ML-GWAS) for precise trait association.
• To establish a theoretical foundation for genetic improvement of wheat quality.

Main Methods:

• Utilized a 55K SNP array for genotyping 273 wheat varieties.
• Applied a multi-locus genome-wide association study (ML-GWAS) model across multi-year field trials.
• Conducted gene co-annotation, Gene Ontology (GO) enrichment analysis, and expression profiling.

Main Results:

• Identified 239 quantitative trait nucleotides (QTNs) associated with dough rheological properties.
• Discovered 13 stable mono-effect QTNs and 7 pleiotropic QTNs, with 3 major-effect QTNs.
• Pinpointed 6 SNP loci and 9 key candidate genes linked to rheological traits after comprehensive analysis.

Conclusions:

• ML-GWAS successfully identified significant SNP loci and candidate genes for wheat dough rheology.
• The findings advance molecular breeding technologies for wheat improvement.
• This research provides a basis for cultivating high-quality wheat varieties with enhanced baking characteristics.