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Methyl jasmonate-induced bHLH42 mediates tissue-specific accumulation of anthocyanins via regulating flavonoid metabolism-related pathways in Caitai

文献类型： 外文期刊

作者： Zhang, Dingyu 1 ; Sun, Lixue 2 ; Xi, Dandan 1 ; Li, Xiaofeng 1 ; Gao, Lu 1 ; Miao, Liming 1 ; Luo, Yong 2 ; Tian, Miaomiao 2 ; Zhu, Hongfang 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Hort Res Inst, Shanghai Key Lab Protected Hort Technol, Shanghai, Peoples R China

2.Fudan Univ, Sch Life Sci, State Key Lab Genet Engn, Shanghai, Peoples R China

3.Fudan Univ, Fudan Ctr Genet Divers & Designing Agr, Sch Life Sci, Shanghai, Peoples R China

期刊名称：PHYSIOLOGIA PLANTARUM （ 影响因子：5.4； 五年影响因子：5.5 ）

ISSN： 0031-9317

年卷期： 2024 年 176 卷 4 期

页码：

收录情况： SCI

摘要： Anthocyanin is a type of plant secondary metabolite beneficial to human health. The anthocyanin content of vegetable and fruit crops signifies their nutritional quality. However, the molecular mechanism of anthocyanin accumulation, especially tissue-specific accumulation, in Caitai, as well as in other Brassica rapa varieties, remains elusive. In the present study, taking advantage of three kinds of Caitai cultivars with diverse colour traits between leaves and stems, we conducted a comparative transcriptome analysis and identified the molecular pathway of anthocyanin biosynthesis in Caitai leaves and stems, respectively. Our further investigations demonstrate that bHLH42, which is robustly induced by MeJA, closely correlates with tissue-specific accumulation of anthocyanins in Caitai; bHLH42 upregulates the expression of flavonoid/anthocyanin biosynthetic pathway genes to activate anthocyanin biosynthesis pathway, importantly, overexpression of bHLH42 significantly improves the anthocyanin content of Caitai. Our analysis convincingly suggests that bHLH42 induced by jasmonic acid signalling plays a crucial role in tissue-specific accumulation of anthocyanins in Caitai.

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