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Verticillium wilt is a soil-borne disease that can cause devastating losses in cotton production. Because there is no effective chemical means to combat the disease, the only effective way to control Verticillium wilt is through genetic improvement. Therefore, the identification of additional disease-resistance genes will benefit efforts toward the genetic improvement of cotton resistance to Verticillium wilt. Based on screening of a BAC library with a partial  Ve  homologous fragment and expression analysis, a  V. dahliae -induced gene,  Gbvdr6 , was isolated and cloned from the Verticillium wilt-resistant cotton  G. barbadense  cultivar Hai7124. The gene was located in the gene cluster containing  Gbve1  and  Gbvdr5  and adjacent to the Verticillium wilt-resistance QTL hotspot.  Gbvdr6  was induced by  Verticillium dahliae  Kleb and by the plant hormones salicylic acid (SA), methyl jasmonate (MeJA) and ethephon (ETH) but not by abscisic acid (ABA). Gbvdr6 was localized to the plasma membrane. Overexpression of  Gbvdr6  in  Arabidopsis  and cotton enhanced resistance to  V. dahliae . Moreover, the JA/ET signaling pathway-related genes  PR3, PDF 1.2, ERF1  and the SA-related genes  PR1  and  PR2  were constitutively expressed in transgenic plants.  Gbvdr6 -overexpressing  Arabidopsis  was less sensitive than the wild-type plant to MeJA. Furthermore, the accumulation of reactive oxygen species and callose was triggered at early time points after  V. dahliae  infection. These results suggest that  Gbvdr6  confers resistance to  V. dahliae  through regulation of the JA/ET and SA signaling pathways.

frontiers in plant science

Gbvdr6, a Gene Encoding a Receptor-Like Protein of Cotton (Gossypium barbadense), Confers Resistance to Verticillium Wilt in Arabidopsis and Upland Cotton