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Aldehyde dehydrogenases (ALDHs) are a superfamily of enzymes which play important role in the scavenging of active aldehydes molecules. In present work, a comprehensive whole-genomic study of  ALDH  gene superfamily was carried out for an allotetraploid cultivated cotton species,  G .  hirsutum , as well as in parallel relative to their diploid progenitors,  G .  arboreum  and  G .  raimondii . Totally, 30 and 58  ALDH  gene sequences belong to 10 families were identified from diploid and allotetraploid cotton species, respectively. The gene structures among the members from same families were highly conserved. Whole-genome duplication and segmental duplication might be the major driver for the expansion of  ALDH  gene superfamily in  G .  hirsutum . In addition, the expression patterns of  GhALDH  genes were diverse across tissues. Most  GhALDH  genes were induced or repressed by salt stress in upland cotton. Our observation shed lights on the molecular evolutionary properties of  ALDH  genes in diploid cottons and their alloallotetraploid derivatives. It may be useful to mine key genes for improvement of cotton response to salt stress.

Comparative genomic study of ALDH gene superfamily in Gossypium: A focus on Gossypium hirsutum under salt stress