文献类型： 外文期刊
作者： Fu, Zhenzhu 1 ; Wang, Limin 1 ; Shang, Hongquan 1 ; Dong, Xiaoyu 1 ; Jiang, Hui 1 ; Zhang, Jing 1 ; Wang, Huijuan 1 ; Li, 1 ;
作者机构： 1.Henan Acad Agr Sci, Hort Res Inst, 116 Huayuan Rd, Zhengzhou 450002, Henan, Peoples R China
关键词： Anthocyanin; Gene function; Phalaenopsis; Transcription factor
期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）
ISSN： 0167-6903
年卷期： 2019 年 88 卷 2 期
页码：
收录情况： SCI
摘要： Anthocyanins are secondary metabolites that are involved in providing flower petal pigmentation. In plants, anthocyanin synthesis is regulated positively by a conserved MYB-bHLH-WD40 (MBW) complex and negatively by repressors. We isolated a repressor of anthocyanin synthesis, MYBx1, from a moth orchid Phalaenopsis cv. Big Chili. MYBx1 encodes a typical R3-MYB protein and exhibited diverse expression patterns in four Phalaenopsis cultivars, Big Chili, Fuller's Sunset, Sogo Yukidian V3, and Sogo Lit-Sunny. A yeast two-hybrid assay analysis indicated that MYBx1 can also participate in the MBW complex by interacting with the transcription factors ANTHOCYANIN (AN) 1 and AN11. Over-expressing MYBx1 in the petunia hybrid M1xR27 resulted in reduced accumulations of flower petal pigments through the repression of anthocyanin activities. A quantitative real-time PCR analysis of the expression patterns of anthocyanin synthesis-related structural genes in the transgenic petunia flower petals showed that the expression levels of chalcone synthase, flavanone 3-hydroxylase, and dihydroflavonol reductase genes were considerably down-regulated. However, no significant changes in the expression levels of the MBW complex members, AN1, AN2, and AN11, were observed. This study improves our understanding of anthocyanin synthesis-related regulatory networks in plants and also provides an important foundation for the further genetic engineering of ornamental plant flower colors.
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