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Toxicity of graphene oxide to white moss Leucobryum glaucum

机译：氧化石墨烯对白色苔藓的毒性

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Environmental biosafety is the key issue in the healthy development of the graphene industry, but the toxicity of graphene to moss is still unknown to date. Herein, we investigated the influence of graphene oxide (GO) on the growth, chlorophyll content and structure of white moss Leucobryum glaucum. Our results indicated that GO did not alter the fresh weight of L. glaucum, but inhibited the dry weight gain seriously, resulting in higher water-holding rates. GO induced the suppression of chlorophyll contents and up-regulated the chlorophyll a/b ratios, thus might influence the photosynthesis of L. glaucum. GO disturbed the microstructure and ultrastructure of L. glaucum at high concentrations, inducing the destruction of cell wall, the separation of cell wall and membrane, and the formation of micropores on the leave surface. GO led to the decrease of glutathione levels and catalase activities of L. glaucum, suggesting the existence of oxidative stress. Our results collectively suggested that graphene had the potential environmental risk to moss plants, and the release of graphene into the environment should be strictly restricted.
机译：环境生物安全性是石墨烯产业健康发展的关键问题，但是迄今为止，石墨烯对苔藓的毒性仍然未知。在此，我们研究了氧化石墨烯（GO）对白色苔藓（Leucobryum glaucum）的生长，叶绿素含量和结构的影响。我们的结果表明GO不会改变 L的鲜重。青草，但严重抑制了干重的增加，从而提高了持水率。 GO诱导了叶绿素含量的抑制并上调了叶绿素a / b的比例，因此可能影响 L的光合作用。青草。 GO干扰了 L的微观结构和超微结构。高浓度青草引起细胞壁的破坏，细胞壁和膜的分离以及叶片表面微孔的形成。 GO导致 L的谷胱甘肽水平和过氧化氢酶活性降低。青草，表明存在氧化应激。我们的研究结果表明，石墨烯对苔藓植物具有潜在的环境风险，应严格限制石墨烯向环境中的释放。

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