Integrated transcriptomics and metabolomics reveal the mechanisms of postharvest uneven degreening of green lemon

文献类型： 外文期刊

第一作者： Zhou, Xianyan

作者： Zhou, Xianyan;Zhang, Birong;Duan, Minxian;Yan, Suyun;Shi, Wenbin;Yue, Jianqiang;Guo, Lina;Du, Yuxia;Gao, Junyan;Zhu, Zhifeng;Xu, Rangwei;Zhu, Feng;Cheng, Yunjiang;Zhang, Hanyao

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关键词： Green lemon; Color; Degreen; Pigment metabolism; Hormones; Gene

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：6.4； 五年影响因子：6.9 ）

ISSN： 0925-5214

年卷期： 2024 年 216 卷

页码：

收录情况： SCI

摘要： Fruit color is closely associated with the commercial value of citrus fruit. Postharvest green lemon is prone to non-uniform coloration during storage, which negatively affects its marketability. To better control postharvest lemon color, it is vital to understand the mechanism for the uneven degreening of lemon fruit. In this study, we investigated the chloroplast development, chlorophyll, carotenoid and hormone contents and related genes involved in lemon degreening by morphological, physiological, and biochemical analysis and transcriptomics. During room temperature storage, the green lemon fruit showed degreening on the day10, and exhibited complete yellowing on the day 40 of storage. The fruit were yellow-green variegated from day 10 to day 40 after harvest. The degreened part showed decreases in chlorophyll, brassinolide (Br), indoleacetic acid (IAA) and gibberellin (GA3) content while accumulation of carotenoids and abscisic acid (ABA). Ethephon (CEPA) treatment accelerated the degreening of green lemon, and decreased the chlorophyll a and b, and IAA contents, while increased the contents of phytofluene, phytoene, and ABA in the flavedo. However, opposite results were obtained under gibberellic acid (GA3) treatment. Transcriptomic profiling analysis under different treatments revealed that the expression of PPH, PSY, NCED4, bHLH25, ERF106 and NAC72 has the highest correlation with pigment metabolism. These results indicate that the uneven degreening of green lemon is associated with uneven distribution of hormones and pigments in the flavedo.

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