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Transcriptome analyses reveal key genes involved in skin color changes of 'Xinlimei' radish taproot

文献类型： 外文期刊

作者： Liu, Tongjin 1 ; Zhang, Youjun 1 ; Zhang, Xiaohui 1 ; Sun, Yuyan 3 ; Wang, Haiping 1 ; Song, Jiangping 1 ; Li, Xixiang 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Vegetables & Flowers, Beijing 100081, Peoples R China

2.Minist Agr, Key Lab Biol & Genet Improvement Hort Crops, Beijing, Peoples R China

3.Zhejiang Acad Agr Sci, Inst Vegetables, Hangzhou 310021, Zhejiang, Peoples R China

关键词： Radish; Skin color changes; Transcriptome; Anthocyanin; Chlorophyll

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

ISSN： 0981-9428

年卷期： 2019 年 139 卷

页码：

收录情况： SCI

摘要： The color of radish (Raphanus sativus) taproot skin is an important visual quality. 'Xinlimei' radish is a red-fleshed cultivar with skin that changes color from red to white and finally to green at the mature stage, and appearance quality is strongly affected if the red color does not fade completely on a single taproot or simultaneously among different taproots. In the present study, anthocyanin and chlorophyll contents and the transcriptome of radish taproot skin at three distinct coloration stages were analyzed to explore the mechanism of color changes. The results showed that decreased anthocyanin and increased chlorophyll contents correlated with the color-fading process. Kyoto Encyclopedia of Genes and Genomes enrichment analysis of differentially expressed genes indicated that anthocyanin and chlorophyll metabolism pathways play important roles in color changes. In red color-fading process, the expression levels of anthocyanin biosynthetic genes (except PAL and C4H), a transport gene (RsTT19), and two anthocyanin biosynthesis transcription factors (TFs) RsMYR1 and RsTT8, were significantly downregulated, whereas peroxidase-encoding genes were significantly upregulated. In the skin-greening process, expression of most chlorophyll biosynthetic genes and two TFs (RsGLK1 and RsGLK2) that likely positively regulate chlorophyll biosynthesis was significantly upregulated. Thus, changes in the expression of these genes may be responsible for the color changes that occur in 'Xinlimei' taproot skin. This is the first report on the roles of chlorophyll metabolism genes and their dynamic relationship with anthocyanin metabolism genes in radish. The findings provide valuable information and theoretical guidelines for improving the appearance quality of 'Xinlimei' radish taproots.

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