New insight into the molecular mechanism of colour differentiation among floral segments in orchids

文献类型： 外文期刊

第一作者： Li, Bai-Jun

作者： Li, Bai-Jun;Zheng, Bao-Qiang;Zou, Long-Hai;Wan, Xiao;Qiao, Hong-Juan;Wang, Yan;Wang, Jie-Yu;Tsai, Wen-Chieh;Tsai, Wen-Chieh;Lu, Hsiang-Chia;Zhang, Di-Yang;Liu, Zhong-Jian;Zou, Long-Hai;Wan, Xiao;Liu, Zhong-Jian

作者机构：

期刊名称：COMMUNICATIONS BIOLOGY （ 影响因子：6.268； 五年影响因子：6.268 ）

ISSN：

年卷期： 2020 年 3 卷 1 期

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收录情况： SCI

摘要： Li et al. provide insights on the color patterning process during flower development. They identify pigment components of the perianths and the lip segments in the Orchidaceae flowers and use transcriptome profiling and functional assays to identify genes involved in pigment biosynthesis and spatiotemporal specificity. An unbalanced pigment distribution among the sepal and petal segments results in various colour patterns of orchid flowers. Here, we explored this type of mechanism of colour pattern formation in flowers of the Cattleya hybrid 'KOVA'. Our study showed that pigment accumulation displayed obvious spatiotemporal specificity in the flowers and was likely regulated by three R2R3-MYB transcription factors. Before flowering, RcPAP1 was specifically expressed in the epichile to activate the anthocyanin biosynthesis pathway, which caused substantial cyanin accumulation and resulted in a purple-red colour. After flowering, the expression of RcPAP2 resulted in a low level of cyanin accumulation in the perianths and a pale pink colour, whereas RcPCP1 was expressed only in the hypochile, where it promoted alpha-carotene and lutein accumulation and resulted in a yellow colour. Additionally, we propose that the spatiotemporal expression of different combinations of AP3- and AGL6-like genes might participate in KOVA flower colour pattern formation.

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