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Artificial high-CO 2  atmosphere (AHCA, 95% CO 2  and 1% O 2 ) has been widely applied as a postharvest de-astringency treatment for persimmon fruit. AHCA increases expression of transcription factors, including ethylene response factors ( DkERF ), that target de-astringency genes. Here, the promoter of  DkERF9 , a previously characterized AHCA-inducible and de-astringency regulator, was utilized to screen a cDNA library by yeast one hybrid assay. A novel NAC transcription factor, named  DkNAC7 , was identified. Dual-luciferase assay indicated that  DkNAC7  could not only trans-activate the promoter of  DkERF9 , but also activated the previously identified deastringency-related gene  DkPDC2 . Real-time PCR analysis showed that  DkNAC7  was up-regulated by AHCA treatment, in concert with the removal of astringency from persimmon fruit and subcellular localization showed  DkNAC7  was located in the nucleus. Thus, these results indicate that  DkNAC7  is a putative transcriptional activator involved in regulating persimmon fruit deastringency by trans-activition on both  DkERF9  and  DkPDC2 , which encodes pyruvate decarboxylase.

DkNAC7, a novel high-CO2/hypoxia-induced NAC transcription factor, regulates persimmon fruit de-astringency