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The plant-specific NAC (NAM, ATAF, and CUC) transcription factors have diverse role in development and stress regulation. A new transcript encoding NAC protein, homologous to nam-like protein 4 from  Petunia  was identified from an ABA-regulated subtractive cDNA library of  Capsicum annuum  seedling. Here, this homolog (named  CaNAC2 ) from  C. annuum  was characterized and investigated its role in abiotic stress tolerance. Our results indicated that a plant-specific and conserved NAC domain was located in the N-terminus domain of  CaNAC2  which was predicted to encode a polypeptide of 410 amino acids. Phylogenetic analysis showed that  CaNAC2  belonged to the NAC2 subgroup of the orthologous group 4d. The protein CaNAC2 was subcellularly localized in the nucleus and it had transcriptional activity in yeast cell.  CaNAC2  was expressed mainly in seed and root. The transcription expression of  CaNAC2  was strongly induced by cold, salt and ABA treatment and inhibited by osmotic stress and SA treatment. Silence of  CaNAC2  in virus-induced gene silenced pepper seedlings resulted in the increased susceptibility to cold stress and delayed the salt-induced leaf chlorophyll degradation. These results indicated that this novel  CaNAC2  gene might be involved in pepper response to abiotic stress tolerance.

Characterization and expression profile of CaNAC2 pepper gene