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Verticillium dahliae  is a causative fungal pathogen and only a few genes have been identified that exhibit critical roles in disease resistance and few has shown positive effects on the resistance to Verticillium wilt in transgenic cotton. We cloned a receptor-like kinase gene ( GbRLK ) induced by  Verticillium dahliae  (VD) in the disease-resistant cotton  Gossypium barbadense  cv. Hai7124. Northern blotting revealed that the  GbRLK  was induced by VD at 96 h after inoculation. The functional  GbRLK  is from D subgenome since a single base deletion results in a frameshift or dysfunctional homologue in the A subgenome in tetraploid cotton. To verify the function of  GbRLK , we developed the overexpression transgenic  GbRLK  cotton and  Arabidopsis  lines, and found that they all showed the higher resistance to Verticillium in the greenhouse and field trial. The results of the expression profile using transgenic and non-transgenic  Arabidopsis thaliana  revealed that the  GbRLK  regulated expressions of a series genes associated with biotic and abiotic stresses. Therefore, we propose that the increased resistance to  Verticillium dahliae  infection in transgnic plants could result from reduction in the damage of water loss and regulation of defense gene expression.

Overexpression of GbRLK, a putative receptor-like kinase gene, improved cotton tolerance to Verticillium wilt