Argonaute proteins (AGOs) are indispensable components of RNA silencing. However, systematic characterization of the genes have not been completed in cotton until now. In this study, cotton genes were identified and analyzed with respect to their evolution and expression profile during biotic and abiotic stresses. We identified 14 , 14 , and 28 genes in the genomes of , , and . Cotton AGO proteins were classified into four subgroups. Structural and functional conservation were observed in the same subgroups based on the analysis of the gene structure and conserved domains. Twenty-four duplicated gene pairs were identified in genes, and all of them exhibited strong purifying selection during evolution. Moreover, RNA-seq analysis showed that most of the genes exhibit high expression levels in the fiber initiation and elongation processes. Furthermore, the expression profiles of genes tested by quantitative real-time polymerase chain reaction (qPCR) demonstrated that they were sensitive to Verticillium wilt infection and salt and drought stresses. Overall, our results will pave the way for further functional investigation of the cotton gene family, which may be involved in fiber development and stress response.
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| http://dx.doi.org/10.3390/genes13081492 | DOI Listing |
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