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Single-trait, multi-locus and multi-trait GWAS using four different models for yield traits in bread wheat.

Parveen Malik1, Jitendra Kumar1,2, Sahadev Singh1

  • 1Department of Genetics and Plant Breeding, Chaudhary Charan Singh University, Meerut 250004, India.

Molecular Breeding : New Strategies in Plant Improvement
|June 13, 2023
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Summary

This genome-wide association study identified novel markers for 10 spring wheat traits. These findings aid in developing improved wheat varieties through marker-assisted selection (MAS).

Keywords:
Agronomic traitsCandidate genesEpistasisGWASMTATriticum aestivum L.

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Area of Science:

  • Plant genetics
  • Agricultural science
  • Quantitative genetics

Background:

  • Understanding the genetic basis of yield and yield components in spring wheat is crucial for crop improvement.
  • Genome-wide association studies (GWAS) are powerful tools for dissecting complex traits.

Purpose of the Study:

  • To conduct a GWAS for 10 yield and yield component traits in 225 diverse spring wheat genotypes.
  • To identify marker-trait associations (MTAs) and candidate genes for improving agronomic traits.

Main Methods:

  • Genotyping 225 spring wheat genotypes with 10,904 SNPs.
  • Phenotypic evaluation across three environments over three years.
  • Utilizing four statistical models (CMLM, FarmCPU, SUPER, mvLMM) and BLUP for MTA analysis.
  • Identifying epistatic interactions and candidate genes.

Main Results:

  • High heritability observed for traits (29.21-97.69%).
  • Identified significant MTAs using different models, with FarmCPU and mvLMM yielding the most significant associations after Bonferroni correction.
  • Discovered 164 putative candidate genes (CGs) associated with the traits.
  • Found epistatic interactions for seven of the 10 traits.

Conclusions:

  • The study provides valuable insights into the genetics of wheat yield and component traits.
  • Novel markers were identified, facilitating marker-assisted selection (MAS) for developing improved wheat cultivars.