Two papaya MYB proteins function in fruit ripening by regulating some genes involved in cell-wall degradation and carotenoid biosynthesis

文献类型： 外文期刊

第一作者： Fu, Changchun

作者： Fu, Changchun;Lu, Yin;Han, Chao;Chen, Hangjun;Gao, Haiyan;Han, Yanchao;Chen, Hangjun;Gao, Haiyan;Han, Yanchao;Chen, Hangjun;Gao, Haiyan;Han, Yanchao

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关键词： papaya; MYB TFs; regulate; fruit ripening

期刊名称：JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE （ 影响因子：3.638； 五年影响因子：3.802 ）

ISSN： 0022-5142

年卷期： 2020 年 100 卷 12 期

页码：

收录情况： SCI

摘要： BACKGROUNDMYB transcription factors (TFs) are common in plants and play important functions in growth and development, including fruit development and ripening. However, the role of MYB proteins in papaya ripening (fruit ripening and carotenoid biosynthesis) remains unclear. RESULTSTwo MYB genes were cloned from papaya pulp. They were named CpMYB1 (MYB44-like) and CpMYB2, and belong to the S22 subgroup of the R2R3-MYB family. Their expression levels decreased during fruit ripening. Subcellular localization analysis showed that both CpMYB1 and CpMYB2 were nuclear proteins, indicating that they might function in the nucleus. Moreover, CpMYB1 and CpMYB2 could bind to the promoters of cell-wall degradation genes (CpPME1, CpPME2, and CpPG5) and carotenoid biosynthesis genes (CpPDS2, CpPDS4, and CpCHY-b). Further research found that both CpMYB1 and CpMYB2 were transcriptional repressors, and they could suppress the activities of the promoters of CpPME1, CpPME2, CpPG5, CpPDS2, CpPDS4, and CpCHY-b. CONCLUSIONThese results indicated that MYB TFs CpMYB1 and CpMYB2 might have a function in papaya fruit softening and carotenoid accumulation by regulating cell-wall degradation and carotenoid biosynthesis related genes, which provide a new view about the role of MYB TFs in fruit ripening. (c) 2020 Society of Chemical Industry

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