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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >A chimeric photoreceptor gene, NEOCHROME, has arisen twice during plant evolution
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A chimeric photoreceptor gene, NEOCHROME, has arisen twice during plant evolution

机译：嵌合光感受器基因NEOCHROME在植物进化过程中出现了两次

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摘要

Although most plant species from algae to flowering plants use blue light for inducing phototropism and chloroplast movement, many ferns, some mosses, and green algae use red as well as blue light for the regulation of these responses, resulting in better sensitivity at low light levels. During their evolution, ferns have created a chimeric photoreceptor (phy3 in Adiantum) between phytochrome (phy) and phototropin (phot) enabling them to use red light effectively. We have identified two genes resembling Adiantum PHY3, NEOCHROME1 and NEOCHROME2 (MsNEO1 and MsNEO2), in the green alga Mougeotia scalaris, a plant famous for its light-regulated chloroplast movement. Like Adiantum PHY3, both MsNEO gene products show phytochrome-typical bilin binding and red/far-red reversibility, the difference spectra matching the known action spectra of light-induced chloroplast movement in Mougeotia. Furthermore, both genes rescue red-light-induced chloroplast movement in Adiantum phy3 mutants, indicating f unctional equivalence. However, the fern and algal genes seem to have arisen independently in evolution, thus providing an intriguing example of convergent evolution.
机译：尽管从藻类到开花植物的大多数植物物种都使用蓝光来诱导向光性和叶绿体运动，但是许多蕨类植物，一些苔藓和绿藻使用红光和蓝光来调节这些响应，从而在低光照水平下具有更高的灵敏度。 。在它们的进化过程中，蕨类植物在植物色素（phy）和光养蛋白（phot）之间产生了一种嵌合光感受器（铁线蕨中的phy3），从而使它们能够有效地利用红光。我们在绿藻Mougeotia scalaris中发现了两个类似于铁线蕨PHY3的基因NEOCHROME1和NEOCHROME2（MsNEO1和MsNEO2），该植物以光调节叶绿体的运动而闻名。像铁线蕨PHY3一样，两种MsNEO基因产物都显示出典型的植物色素结合胆红素和红色/远红色可逆性，其差异光谱与光致叶绿体在Mougeotia中的已知作用光谱相匹配。此外，这两个基因在铁线菌属phy3突变体中挽救了红光诱导的叶绿体运动，表明功能等价。但是，蕨类和藻类基因似乎在进化中独立出现，因此提供了一个有趣的融合进化实例。

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