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Cysteine-rich receptor-like kinases ( CRKs ) are a large subfamily of plant receptor-like kinases that play a critical role in disease resistance in plants. However, knowledge about the  CRK  gene family in cotton and its function against Verticillium wilt (VW), a destructive disease caused by  Verticillium dahliae  that significantly reduces cotton yields is lacking. In this study, we identified a total of 30 typical  CRKs  in a  Gossypium barbadense  genome ( GbCRKs ). Eleven of these (>30%) are located on the A06 and D06 chromosomes, and 18 consisted of 9 paralogous pairs encoded in the A and D subgenomes. Phylogenetic analysis showed that the  GbCRKs  could be classified into four broad groups, the expansion of which has probably been driven by tandem duplication. Gene expression profiling of the  GbCRKs  in resistant and susceptible cotton cultivars revealed that a phylogenetic cluster of nine of the  GbCRK  genes were up-regulated in response to  V. dahliae  infection. Virus-induced gene silencing of each of these nine  GbCRKs  independently revealed that the silencing of  GbCRK18  was sufficient to compromise VW resistance in  G. barbadense . GbCRK18 expression could be induced by  V. dahliae  infection or jasmonic acid, and displayed plasma membrane localization. Therefore, our expression analyses indicated that the  CRK  gene family is differentially regulated in response to Verticillium infection, while gene silencing experiments revealed that  GbCRK18  in particular confers VW resistance in  G. barbadense .

frontiers in plant science

Genome-Wide Identification and Functional Analyses of the CRK Gene Family in Cotton Reveals GbCRK18 Confers Verticillium Wilt Resistance in Gossypium barbadense