NAC Transcription Factor PpNAP4 Promotes Chlorophyll Degradation and Anthocyanin Synthesis in the Skin of Peach Fruit

文献类型： 外文期刊

第一作者： Dai, Jieyu

作者： Dai, Jieyu;Xu, Ze;Fang, Zhouheng;Zheng, Xuyang;Kang, Tongyang;Xu, Yuting;Zhang, Xingzhen;Zhan, Qianjin;Hu, Yanan;Zhao, Caiping;Xu, Ze;Xu, Ze;Xu, Ze;Cao, Lijun;Cao, Lijun;Wang, Hong

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关键词： peach fruit; chlorophyll degradation; anthocyaninbiosynthesis; PpSGR; NAC transcription factor; PpNAP4

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：6.2； 五年影响因子：6.4 ）

ISSN： 0021-8561

年卷期： 2024 年 72 卷 36 期

页码：

收录情况： SCI

摘要： Chlorophyll (Chl) catabolism and anthocyanin synthesis play pivotal roles in determining the final skin color of fruits during maturation. However, in peach (Prunus persica) fruit, the regulatory mechanism governing skin color, especially the Chl catabolism, remains largely elusive. In this study, we identified ten Chl catabolic genes (CCGs), with PpSGR emerging as a key regulator in Chl degradation in peaches. Furthermore, a NAC-like, activated by AP3/P1 (NAP) transcription factor (TF), PpNAP4, was identified as a positive modulator of Chl breakdown. PpNAP4 induced the expression of PpSGR and other CCGs, including PpPPH, PpPAO, and PpTIC55-2, by directly binding to their promoters. Overexpression of PpNAP4 resulted in a heightened expression of these genes and accelerated Chl degradation. Notably, PpNAP4 also positively regulated the expression of PpANS and PpMYB10.1, one key structural gene and a core transcriptional regulator of anthocyanin synthesis, thereby contributing to fruit coloration. In summary, our findings elucidate that PpNAP4 serves as a pivotal regulator in determining the final skin color of peach by orchestrating Chl degradation and anthocyanin accumulation through direct activation of multiple CCGs and anthocyanin related genes.

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