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Tubby-like proteins (TLPs) possess a highly conserved closed β barrel tubby domain at C-terminal and N-terminal F-box. The role of  TLP  gene family members has been widely discussed in numerous organisms; however, the detailed genome-wide study of this gene family in  Gossypium  species has not been reported till date. Here, we systematically identified 105  TLP  gene family members in cotton ( Gossypium arboreum, Gossypium raimondii, Gossypium hirsutum , and  Gossypium barbadense ) genomes and classified them into eight phylogenetic groups. Cotton  TLP12  gene family members clustered into two groups, 4 and 8. They experienced higher evolutionary pressure in comparison to others, indicating the faster evolution in both diploid as well as in tetraploid cotton. Cotton  TLP  gene family members expanded mainly due to segmental duplication, while only one pair of tandem duplication was found in cotton  TLPs  paralogous gene pairs. Subsequent qRT-PCR validation of seven putative key candidate genes of  GhTLPs  indicated that  GhTLP11A  and  GhTLP12A.1  genes were highly sensitive to salt and drought stress. The co-expression network, pathways, and  cis -regulatory elements of  GhTLP11A  and  GhTLP12A.1  genes confirmed their functional importance in salt and drought stress responses. This study proposes the significance of  GhTLP11A  and  GhTLP12A.1  genes in exerting control over salt and drought stress responses in  G. hirsutum  and also provides a reference for future research, elaborating the biological roles of  G. hirsutum TLPs  in both stress responses.

frontiers in plant science

Genome-Wide Identification and Evolutionary Analysis of Gossypium Tubby-Like Protein (TLP) Gene Family and Expression Analyses During Salt and Drought Stress