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Background   Sulfotransferases ( SOTs ) (EC 2.8.2.-) play a crucial role in the sulphate conjugation reaction involved in plant growth, vigor, stress resistance and pathogen infection.  SOTs  in Arabidopsis have been carried out and divided into 8 groups. However, the systematic analysis and functional information of  SOT  family genes in cotton have rarely been reported.Results   According to the results of BLASTP and HMMER, we isolated 46, 46, 76 and 77  SOT  genes in the genome  G. arboreum ,  G. raimondii ,  G. barbadense  and  G. hirsutum , respectively. A total of 170 in 245  SOTs  were further classified into four groups based on the orthologous relationships comparing with  Arabidopsis , and tandem replication primarily contributed to the expansion of  SOT  gene family in  G. hirsutum . Expression profiles of the  GhSOT  showed that most genes exhibited a high level of expression in the stem, leaf, and the initial stage of fiber development. The localization analysis indicated that  GhSOT67  expressed in cytoplasm and located in stem and leaf tissue. Additionally, the expression of  GhSOT67  were induced and the length of stem and leaf hairs were shortened after gene silencing mediated by  Agrobacterium , compared with the blank and negative control plants.Conclusions   Our findings indicated that  SOT  genes might be associated with fiber development in cotton and provided valuable information for further studies of  SOT  genes in  Gossypium .

Identification and characterization analysis of sulfotransferases (SOTs) gene family in cotton (Gossypium) and its involvement in fiber development