Genomic Comparison of the P-ATPase Gene Family in Four Cotton Species and Their Expression Patterns in .

Plant P-type H⁺-ATPase (P-ATPase) is a membrane protein existing in the plasma membrane that plays an important role in the transmembrane transport of plant cells. To understand the variety and quantity of P-ATPase proteins in different cotton species, we combined four databases from two diploid cotton species ( and ) and two tetraploid cotton species ( and ) to screen the P-ATPase gene family and resolved the evolutionary relationships between the former cotton species. We identified 53, 51, 99 and 98 genes from , and , respectively. The structural and phylogenetic analyses revealed that the gene structure was consistent between genes, with a close evolutionary relationship. The expression analysis of genes showed that many genes were highly expressed in various tissues and at different fiber developmental stages in , suggesting that they have potential functions during growth and fiber development in cotton.