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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Characterization of Biofilm Formed by Phenanthrene-Degrading Bacteria on Rice Root Surfaces for Reduction of PAH Contamination in Rice
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Characterization of Biofilm Formed by Phenanthrene-Degrading Bacteria on Rice Root Surfaces for Reduction of PAH Contamination in Rice

机译：水稻根表面菲降解细菌形成的生物膜的特性用于减少水稻中PAH污染

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One effective method in to reduce the uptake of organic contaminants by plants is the development of a root barrier. In this study, the characterization of biofilm structure and function by phenanthrene-degrading Pseudomonas sp. JM2-gfp on rice root surfaces were carried out. Our results showed that root surfaces from three rice species, namely Liaojing401, Koshihikari, and Zhenzhuhong all present hydrophobicity and a high initial adhesion of strain JM2-gfp. Matured robust biofilm formation occurred at 48 h on the root surfaces. The biofilm exhibited cell dense aggregates and biomass embedded in the extracellular polymeric substance (EPS) matrix. EPS composition results showed that the proteins, carbohydrates, lipids and nucleic acids are produced in the biofilm, while the content varied with rice species. Under the initial concentration of phenanthrene 50 mg·L−1, the residual phenanthrene in plant roots from ‘Zhengzhuhong’, ‘Koshihikari’ and ‘Liaojing401’ with biofilm mediated were significantly decreased by 71.9%, 69.3% and 58.7%, respectively, compared to those without biofilm groups after 10 days of exposure. Thus, the biofilm colonized on roots plays an important role of degradation in order to reduce the level of phenanthrene uptake of plants. Thereby, the present work provides significant new insights into lowering the environmental risks of polycyclic aromatic hydrocarbons (PAHs) in crop products from contaminated agriculture soils.
机译：减少植物吸收有机污染物的一种有效方法是开发根系屏障。在这项研究中，通过菲降解的假单胞菌sp。的生物膜结构和功能的表征。在稻根表面上进行JM2-gfp。我们的研究结果表明，辽粳401，越光和振竹红这三种水稻的根表面均具有疏水性，并且菌株JM2-gfp的初始粘附力很高。成熟的牢固的生物膜形成发生在根表面48小时。生物膜表现出细胞致密的聚集体和嵌入细胞外聚合物（EPS）基质中的生物质。 EPS组成结果表明，生物膜中产生蛋白质，碳水化合物，脂质和核酸，而含量随水稻种类而变化。在菲初始浓度为50 mg·L −1 下，生物膜介导的“正竹红”，“越光”和“辽粳401”植物根系中的残留菲分别减少了71.9％，69.3％。与暴露10天后没有生物被膜组的相比，分别为58.7％和58.7％。因此，定植在根部上的生物膜起着重要的降解作用，以降低植物对菲的吸收水平。因此，本工作为降低受污染农业土壤中的农产品中的多环芳烃（PAHs）的环境风险提供了重要的新见识。

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