Reassessment of a GWAS study of submergence survival in Arabidopsis highlights new genetic hubs and pathways involved in stress tolerance

Climate change threatens global crop productivity, making it crucial to understand the genetic basis of plant stress tolerance. A decade ago, a genome-wide association study (GWAS) in Arabidopsis thaliana identified genetic loci linked to survival under submergence. Since then, genomic resources have expanded. This study reanalyzes that original phenotypic dataset using updated, high-density SNP databases and other platforms to uncover new genetic components of submergence tolerance. Our reassessment successfully recovered 15 of the 20 previously reported SNPs and identified locus-level concordance for these previously reported SNPs regions and expanded the candidate list with an additional 104 new genes. These genes participate in biological pathways coherent for submergence survival, including cell wall/cytoskeleton remodeling, reactive oxygen species management, hormone signaling (ethylene, auxin, and ABA), and energy-saving metabolic reprogramming involving nucleotide salvage, translational control, and C:N management. Notably, we identify ten overlapping genetic signals between analyses, including a histidyl-tRNA synthetase (HRS1) and an uncharacterized ethylene-responsive factor (ERF17), and signals in the long arm of Chromosome 5, suggesting putative integrative nodes. This study demonstrates that reassessing existing GWAS data with updated models, cross-platform validation, and transcriptional filtering can expand biologically relevant gene lists for future experimental validation and crop improvement.