文献类型： 外文期刊
第一作者： Wang, Rui
作者： Wang, Rui;Mao, Chanjuan;Ming, Feng;Wang, Rui;Mao, Chanjuan;Ming, Feng
作者机构：
关键词： PeMYB4L; Anthocyanin; VIGS; Phalaenopsis; MYB-bHLH; PeCHS
期刊名称：PLANT SCIENCE （ 影响因子：5.363； 五年影响因子：5.454 ）
ISSN： 0168-9452
年卷期： 2022 年 324 卷
页码：
收录情况： SCI
摘要： Phalaenopsis spp., one genus of Orchidaceae, have become very popular worldwide for their fascinating flowers with various colors and pigmentation patterns. Several R2R3-MYB transcription factors have been reported to function in anthocyanin accumulation in Phalaenopsis spp. However, its molecular mechanism underlying the detailed regulatory pathway remains poorly understood. In this study, we identified a novel subgroup 2 R2R3-MYB transcription factor PeMYB4L, the expression profile of which was concomitant with red color formation in Phalaenopsis spp. flowers. Virus-induced gene silencing (VIGS) and transient overexpression assay verified that PeMYB4L promotes anthocyanin accumulation in flower tissues. In addition, PeMYB4L could directly regulates the expression of Phalaenopsis spp. chalcone synthase gene (PeCHS) through MYBST1 (GGATA) binding site. It's interesting that the basic-helix-loop-helix (bHLH) protein PeMYC4 shows opposite expression pattern from PeMYB4L in anthocyanin accumulation. Furthermore, PeMYC4 was verified to form MYB-bHLH complex with PeMYB4L, and attenuated the expression of PeCHS and weakened anthocyanin production, indicating a novel regulatory model of MYB-bHLH complex. Our findings uncover the detailed regulatory pathway of MYB-bHLH, and might provide a new insight into the complicated anthocyanin pigmentation in Phalaenopsis spp.
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