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Ethylene-responsive factors ( ERF ) are usually considered to play diverse roles in plant response to biotic and abiotic stresses. In this study, an  ERF  gene  CaPTI1  was isolated from pepper transcriptome database.  CaPTI1  contains an open reading frame (ORF) of 543 bp, which encodes a putative polypeptide of 180 amino acids with a theoretical molecular weight of 20.30 kDa. Results of expression profile showed that  CaPTI1  had a highest expression level in roots and this gene could not only response to the infection of  Phytophthora capsici  and the stresses of cold and drought, but also be induced by the signaling molecule (salicylic acid, Methyl Jasmonate, Ethephon, and hydogen peroxide). Furthermore, virus-induce gene silencing (VIGS) of  CaPTI1  in pepper weakened the defense response significantly by reducing the expression of defense related genes  CaPR1 ,  CaDEF1  and  CaSAR82  and also the root activity. These results suggested that  CaPTI1  is involved in the regulation of defense response to  P. capsici  in pepper.

A New Ethylene-Responsive Factor CaPTI1 Gene of Pepper (Capsicum annuum L.) Involved in the Regulation of Defense Response to Phytophthora capsici