Genome-Wide Association Study Reveals Candidate Genes for Drought Stress in Soybean

Strategic Insights -

Investigators at the Soybean Research Institute have made a groundbreaking discovery in the field of plant science, shedding light on the genetic basis of soybean drought resistance at the germination stage. According to a newly published study, a diverse panel of 207 soybean accessions was examined to identify drought-tolerance phenotypes, leveraging 95,043 high-density single-nucleotide polymorphism (SNP) markers. The research team utilized a restricted two-stage multi-locus genome-wide association study (RTM-GWAS) method to detect 58 quantitative trait loci (QTLs), with 10 considered as large-contribution QTLs. Furthermore, RNA-sequencing was performed on the roots of two soybean accessions with contrasting drought tolerance, resulting in the identification of 4,012 and 4,586 genes responsive to drought stress at 12h and 24h, respectively.

Key Takeaways:

  • The research highlighted the importance of drought resistance in soybean production, which is threatened globally by abiotic stress.
  • A diverse panel of 207 soybean accessions was examined to identify drought-tolerance phenotypes, leveraging 95,043 high-density SNP markers.
  • The RTM-GWAS method detected 58 QTLs, with 10 considered as large-contribution QTLs that have larger phenotype variation.
  • RNA-sequencing on two soybean accessions with contrasting drought tolerance identified 4,012 and 4,586 genes responsive to drought stress at 12h and 24h, respectively.
  • A weighted gene co-expression network analysis (WGCNA) was constructed, and 13 distinct modules were obtained, with four modules considered as key modules.
  • Forty hub genes were identified in these four modules, and 22 candidate genes underlying large-contribution QTLs were identified through combining RTM-GWAS and transcriptome analysis.
  • The research concluded that five genes (Glyma.12G141700, Glyma.15G040000, Glyma.05G049300, Glyma.14G105900, and Glyma.15G041100) were the most possible candidate genes that regulate soybean drought tolerance at the germination stage.

Statistics:

  • 207 soybean accessions were examined in the study.
  • 95,043 high-density SNP markers were leveraged for identifying drought-tolerance phenotypes.
  • 58 QTLs were detected through the RTM-GWAS method.
  • 10 large-contribution QTLs were identified that have larger phenotype variation.
  • 4,012 and 4,586 genes were identified as responsive to drought stress at 12h and 24h, respectively.
  • 13 distinct modules were obtained through WGCNA, with four modules considered as key modules.
  • 40 hub genes were identified in these four modules.
  • 22 candidate genes were identified through combining RTM-GWAS and transcriptome analysis.

Sources:

  • Frontiers in Plant Science. "Genome-wide association study and transcriptome analysis reveal candidate genes related to drought stress in the germination stage of soybean." Frontiers in Plant Science, vol. 16, 2025.
  • The publisher for Frontiers in Plant Science is Frontiers Media S.A.
  • Keke Kong, Soybean Research Institute, Institute of Jiangxi Oil-tea Camellia &.
  • Additional authors for this research include Mengge Xu, Lanhua Wu, Huiwen Zhou, Ruikai Wang, Tuanjie Zhao, Chune Wang, Yingpei Song.