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PLANT CELL ENVIRON: 太阳紫外线影响苹果果实中的类黄酮代谢

已有 4581 次阅读 2018-2-6 09:03 |个人分类:每日摘要|系统分类:论文交流


Solar UV light regulates flavonoid metabolism in apple (Malus x domestica)


First author: Rebecca A. Henry-Kirk; Affiliations: The New Zealand Institute for Plant and Food Research Limited (新西兰植物和食品研究院): Auckland, New Zealand
Corresponding author: Richard V. Espley


Ultraviolet-B light (UV-B; 紫外线) is one environmental signal perceived by plants that affects the flavonoid pathway and influences the levels of anthocyanins (花青素), flavonols (黄酮醇), and proanthocyanidins (原花青素). To understand the mechanisms underlying UV exposure, apple trees were grown under spectral (光谱的) filters that altered transmission of solar UV light. Fruit analysis showed that UV induced changes in physiology, metabolism, and gene expression levels during development over a season. These changes were sustained after storage. Under low UV, ripening was delayed, fruit size decreased, and anthocyanin and flavonols were reduced. Expression analysis showed changes in response to UV light levels for genes in the regulation and biosynthesis of anthocyanin and flavonols. Transcription of flavonol synthase (FLS), ELONGATED HYPOCOTYL 5 (HY5), MYB10, and MYB22 were down-regulated throughout fruit development under reduced UV. Functional testing showed that the FLS promoter was activated by HY5, and this response was enhanced by the presence of MYB22. The MYB22 promoter can also be activated by the anthocyanin regulator, MYB10. As ambient (环境) levels of UV light vary around the globe, this study has implications for future crop production, the quality of which can be determined by the response to UV.



紫外线UV-B是一种植物能够感知的自然信号,其能够影响类黄酮通路,并且影响花青素、黄酮醇以及原花青素的水平。为了进一步理解UV照射下植物内部的分子机制,作者将苹果树生长在严格控制的光照环境下,可以通过光谱过滤器改变太阳光中紫外线照射强度。果实分析显示UV可以诱导整个生长季节中生理、代谢以及基因表达的改变。这些改变在果实进入贮藏之后仍然持续存在。在低水平的UV下,果实成熟会被延迟,果实大小会有所减小,花青素和黄酮醇的含量也会降低。表达分析显示控制花青素和黄酮醇调控和生物合成基因的表达会响应UV照射发生改变。低水平的UV照射下,黄酮醇合酶基因FLS,下胚轴伸长基因HY5MYB10MYB22都会在整个果实发育过程中下调表达。功能测试显示FLS的启动子会被HY5蛋白激活,且该过程会被MYB22蛋白所增强。另外,MYB22启动子可以被花青素的调控蛋白MYB10所激活。由于全球的环境紫外线水平存在差异,本文的研究显示作物质量可能会与UV的响应相关,这对于未来的作物生产有所提示。




doi: 10.1111/pce.13125


Journal: Plant, Cell & Environment
First Published date: 05 February, 2018

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https://blog.sciencenet.cn/blog-3158122-1098628.html

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