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首页> 外文期刊>Plant Physiology and Biochemistry >Functional roles of flavonoids in photoprotection: New evidence, lessons from the past(Review)
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Functional roles of flavonoids in photoprotection: New evidence, lessons from the past(Review)

机译：黄酮类化合物在光保护中的功能作用：新证据，过去的经验教训（综述）

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We discuss on the relative significance of different functional roles potentially served by flavonoids in photoprotection, with special emphasis to their ability to scavenge reactive oxygen species (ROS) and control the development of individual organs and whole plant. We propose a model in which chloroplast-located flavonoids scavenge H_2O_2 and singlet oxygen generated under excess light-stress, thus avoiding programmed cell death. We also draw a picture in which vacuolar flavonoids in conjunction with peroxidases and ascorbic acid constitute a secondary antioxidant system aimed at detoxifying H_2O_2, which may diffuse out of the chloroplast at considerable rates and enter the vacuole following excess light stress-induced depletion of ascorbate peroxidase. We hypothesize for flavonols key roles as developmental regulators in early and current-day land-plants, based on their ability to modulate auxin movement and auxin catabolism. We show that antioxidant flavonoids display the greatest capacity to regulate key steps of cell growth and differentiation in eukaryotes. These regulatory functions of flavonoids, which are shared by plants and animals, are fully accomplished in the nM concentration range, as likely occurred in early land plants. We therefore conclude that functions of flavonoids as antioxidants and/or developmental regulators flavonoids are of great value in photoprotection. We also suggest that UV-B screening was just one of the multiple functions served by flavonoids when early land-plants faced an abrupt increase in sunlight irradiance.
机译：我们讨论了黄酮类化合物在光保护中可能发挥的不同功能作用的相对重要性，并特别强调了它们清除活性氧（ROS）并控制单个器官和整个植物发育的能力。我们提出了一个模型，其中叶绿体定位的类黄酮清除H_2O_2和在过量光胁迫下产生的单线态氧，从而避免程序性细胞死亡。我们还画了一张图片，其中液泡黄酮类化合物与过氧化物酶和抗坏血酸一起构成了旨在使H_2O_2解毒的次级抗氧化剂系统，H_2O_2可能以相当高的速率从叶绿体中扩散出来，并在过量的光胁迫引起抗坏血酸过氧化物酶的耗尽后进入液泡。基于黄酮醇调节植物生长素运动和植物生长素分解代谢的能力，我们推测黄酮醇在早期和当今土地植物中作为发育调节剂的关键作用。我们表明，抗氧化剂类黄酮显示出最大的能力来调节真核生物中细胞生长和分化的关键步骤。植物和动物共有的类黄酮的这些调节功能在nM浓度范围内完全实现，这很可能发生在早期的陆地植物中。因此，我们得出结论，类黄酮作为抗氧化剂和/或发育调节剂的功能在光保护中具有重要价值。我们还建议，当早期的陆地植物面临日照辐射的突然增加时，UV-B筛选只是类黄酮所具有的多种功能之一。

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