Genome-Wide Identification and Abiotic Stress-Responsive Expression Analysis of the <i>SOS1</i> Gene Family in <i>Gossypium hirsutum</i> L.

ABSTRACT: The Salt Overly Sensitive 1 (SOS1) gene family encodes plasma membrane Na⁺/H⁺ antiporters essential for ionic homeostasis and salt tolerance in plants. Here, we performed a comprehensive genome-wide characterization of SOS1 genes in allotetraploid cotton (Gossypium hirsutum L.). Fifteen GhSOS1 genes were identified and found unevenly distributed across the A and D subgenomes, indicating that segmental duplication, rather than tandem duplication, was the major driver of family expansion. Phylogenetic analysis resolved four well-supported clades, revealing deep conservation with dicot homologs from Arabidopsis thaliana, Solanum species, and Vigna trilobata, alongside cotton-specific diversification. Ka/Ks ratios in

SUBMITTER: Iqra L 

PROVIDER: S-EPMC12735070 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature