茶氨酸
生物
生物合成
转录因子
生物化学
基因表达
MYB公司
基因
抄写(语言学)
电泳迁移率测定
细胞生物学
绿茶
食品科学
语言学
哲学
作者
Nianci Xie,Xiangxiang Huang,Jiaxin Zhou,Xiaofeng Song,Junming Lin,Meihong Yan,Mingzhi Zhu,Juan Li,Kunbo Wang
出处
期刊:Plant Science
[Elsevier]
日期:2023-11-01
卷期号:336: 111850-111850
被引量:4
标识
DOI:10.1016/j.plantsci.2023.111850
摘要
Theanine is a unique secondary metabolite in tea plants and contributes to the umami taste and health benefits of tea. However, theanine biosynthesis in tea plants is not fully understood, and its mechanism of transcriptional regulation remains poorly reported. Theanine content was significantly correlated with the expression of theanine biosynthesis-related gene CsGS1c and transcription factor CsMYB42 in different leaf positions and picking times, but there was no significant correlation in different tissues of albino tea plant 'Anjibaicha'. This suggests that CsMYB42 may regulate CsGS1c to synthesize theanine in albino tea leaves, and the regulation is tissue specific. CsMYB42 is a nuclear-localized R2R3-MYB transcription factor gene with transcriptional activation activity. Yeast one-hybrid assay and electrophoretic mobility shift assay confirmed the direct binding of CsMYB42 to the promoter of CsGS1c. Luciferase assay showed that CsMYB42 activates the CsGS1c expression. Furthermore, the inhibition of CsMYB42 using an antisense oligonucleotide in tea leaves decreased CsGS1c expression and theanine content. These results indicate that CsMYB42 plays a crucial role in activating the expression of CsGS1c and may be involved in the biosynthesis of theanine in albino tea leaves. This study provides fresh insights into the tissue-specific regulation of theanine biosynthesis, which laid a foundation for breeding high-theanine tea plants.
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