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Cotton is one of the most economically important crops, but most cultivated varieties lack adequate innate immunity or resistance to  Verticillium  wilt. This results in serious losses to both yield and fiber quality. To identify the genetic resources for innate immunity and understand the pathways for pathogen defenses in this crop, here we focus on orthologs of the central  Arabidopsis thaliana  defense regulator  Enhanced Disease Susceptibility  1 ( EDS1 ). The full-length cDNA of  GbEDS1  was obtained by screening the full-length cDNA library of  Gossypium barbadense  combining with RACE strategy. Its open reading frame is 1848 bp long, encoding 615 amino acid residues. Sequence analysis showed that GbEDS1 contains a conserved N-terminal lipase domain and an EDS1-specific KNEDT motif. Expression profiling indicated that the gene is induced by  Verticillium dahliae  as well as salicylic acid (SA) treatment. Subcellular localization assays revealed that GbEDS1 is located in the cell cytoplasm and nucleus. Overexpression of  GbEDS1  in  Arabidopsis  dramatically up-regulated SA and H 2 O 2  production, resulting in enhanced disease resistance to  V. dahliae . Silencing of  GbEDS1  in  G. barbadense  significantly decreased SA and H 2 O 2  accumulation, leading to the cotton more susceptibility. Moreover, combining the gene expression results from transgenic  Arabidopsis  and silenced-GbEDS1 cotton, it indicated that  GbEDS1  could activate  GbNDR1  and  GbBAK1  expression. These findings not only broaden our knowledge about the biological role of  GbEDS1 , but also provide new insights into the defense mechanisms of  GbEDS1  against  V. dahliae  in cotton.

frontiers in plant science

Island Cotton Enhanced Disease Susceptibility 1 Gene Encoding a Lipase-Like Protein Plays a Crucial Role in Response to Verticillium dahliae by Regulating the SA Level and H2O2 Accumulation