根表功能细菌生物膜及其在土壤有机污染控制与修复中的潜在应用价值

土壤中的有机污染物可从根系进入植物体内，并可进一步通过食物链富集，从而威胁人群健康。植物根际微生物种类繁多、数量巨大，其中很多根际细菌可通过成膜作用在植物根表形成细菌生物膜，协助植物抵抗外界的不良环境或促进植物生长。有机污染物在被植物根系吸收的过程中，多需经过根表细菌生物膜这一特殊界面。综述了根际细菌在植物根表的成膜作用，以及根表功能细菌生物膜对污染物根际环境过程的影响及作用机理，分析了利用根表功能细菌生物膜调控植物吸收有机污染物的可行性，试图为防治土壤有机污染、降低作物污染风险、保障农产品安全等提供理论依据。

Biofilm Formation of Functional Bacteria on Root Surfaces and Its Potential Applications on Organic Contaminant Control and Soil Remediation

Organic pollutants present in soil may be taken up by plants and accumulated through food chain, thus threatening human health. There are amount of bacterial cells existed in rhizosphere soil, and many of them usually form biofilms on root surfaces, protecting plants from external harsh environments or promoting plant growth. Organic contaminants always need to pass through the biofilm on root surfaces before taken up by plant. In this paper, the formation of bacterial biofilm associated with roots were elucidated. The impacts of functional biofilm on the behavior of contaminants in rhizosphere were elucidated, and the mechanisms involved were clarified. Finally, we proposed a biofilm-mediated technique to eliminate plant organic contamination in polluted soils, hence benefiting agriculture production, food safety, and human and ecological health in contaminated sites.