接种功能内生细菌降低作物体内POPs污染

如何有效地去除污染区农作物体内持久性有机污染物(POPs),以规避作物POPs污染风险、保障农产品安全,实现污染土壤的资源化利用备受国际关注。植物体内含有内生细菌(EB),其数量和种类丰富,且能重新定殖在目标植物组织的间隙或细胞内部,促进植物生长、提高植物抗逆性,甚至减少植物体内POPs含量。能否利用植物-功能EB的微生态系统,从污染区植物体内获得具有POPs降解特性的功能EB,并将其重新定殖在目标农作物中,进而降低作物体内POPs含量、规避作物污染风险?本文综述了农业生态系统中作物体内POPs的污染现状及植物对POPs的吸收调控作用,系统地评估了具有POPs降解特性的功能EB在目标植物体内的定殖、传导及效能,阐释了功能EB调控植物体内POPs污染的作用机理,展望了功能EB定殖在作物体内调控其POPs污染的优点及仍需解决的技术问题,旨在为利用植物-功能EB的微生态系统规避作物体内POPs污染风险、保障农产品安全和人群健康提供新思路和途径。

Feasibility Analysis for Mitigating the Contamination of POPs in Crops Through Inoculation with Functional Endophytic Bacteria

Contamination of food-crops with persistent organic pollutants(POPs)poses a great concern to food safety because of their toxicity, persistence, long-range transport and potential to bioaccumulate. Thus, how to avoid the residual of POPs in food-crops grown in POP-contaminated areas is essential for ensuring the safety of agricultural products and human health. Plant-endophytic bacteria(EB)symbioses are ubiquitous and have attained increasing acceptance as viable cleanup technologies to remove POPs in planta due to its low cost and being environment-friendly. It has been indicated that functional EB can enhance plant growth, reduce plant disease, and stimulate plant resistance to harsh external environments. Notably, certain functional EB can also lessen POPs accumulation in plants. However, the information is limited regarding the impact of functional endophytic colonization on POPs biodegradation and biotransformation in food-crops. Aimed at the problems, this paper reviewed the situation of crop contaminated by POPs in agroecosystems and its regulatory role in the transformation of POPs. More importantly, the influence of endophytic colonization on the biodegradation and biotransformation of POPs in crop cells were systematically estimated. The effectiveness of POPs biodegradation mainly depended on the abundance and activity of inoculated functional EB in plant compartments. Additionally, the advances, challenges, and existing issues of functional EB for reducing the risk of food-crops POP contamination were also prospected. These findings can be applied for utilizing endophytes to treat POPs in food-crops at POP-contaminated matrices, with ultimate goal of protecting food security and human health.