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Background Nucleobase–ascorbate transporters (NAT), synonymously called nucleobase–cation symporter 2 (NCS2) proteins, were earlier reported to be involved in plant growth, development and resistance to stress. Previous studies concluded that s a polymorphic SNP associated with  NAT12  was significant different between salt-tolerant and salt-sensitive materials of upland cotton. In current study, a comprehensive analysis of  NAT  family genes was conducted for the first time in cotton. Results In this study, we discovered 32, 32, 18, and 16  NAT  genes in  Gossypium hirsutum ,  G. barbadense ,  G. raimondii  and  G. arboreum , respectively, which were classified into four groups (groups I–IV) based on the multiple sequence analysis. These  GhNAT  genes were unevenly distributed on At and Dt sub-genome in  G. hirsutum . Most  GhNAT  members in the same group had similar gene structure characteristics and motif composition. The collinearity analysis revealed segmental duplication as well as tandem duplication contributing to the expansion of the  GhNATs . The analysis of  cis -acting regulatory elements of  GhNATs  showed that the function of  GhNAT  genes in cotton might be related to plant hormone and stress response. Under different conditions, the expression levels further suggested the  GhNAT  family genes were associated with plant response to various abiotic stresses. GhNAT12 was detected in the plasma membrane. And it was validated that the  GhNAT12  gene played an important role in regulating cotton resistance to salt and drought stress through the virus-induced gene silencing (VIGS) analysis. Conclusions A comprehensive analysis of  NAT  gene family was performed in cotton, including phylogenetic analysis, chromosomal location, collinearity analysis, motifs, gene structure and so on. Our results will further broaden the insight into the evolution and potential functions of  NAT  genes in cotton. Current findings could make significant contribution towards screening more candidate genes related to biotic and abiotic resistance for the improvement in cotton.

journal of cotton research

Characters and structures of the nucleobase–ascorbate transporters (NAT) family genes in Gossypium hirsutum and their roles in responding to salt and drought stresses