丛枝菌根对土壤-植物系统中重金属迁移转化的影响
Effects of Arbuscular Mycorrhizal Fungi on Heavy Metal Translocation and Transformation in the Soil-Plant Continuum
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摘要: 丛枝菌根真菌(arbuscular mycorrhizal fungi,AMF)是一类在自然和农业生态系统中广泛存在并能与多数陆生植物形成共生关系的土壤真菌,在重金属污染土壤中对宿主植物的生长及吸收累积重金属具有重要影响,因而对污染土壤的生物修复具有潜在应用价值。以重金属从根际土壤进入植物并在植物体内再分配过程为主线,介绍丛枝菌根在这一过程中对重金属环境行为,特别是根际土壤中重金属赋存形态及植物吸收重金属的影响。最后,对丛枝菌根影响植物重金属耐性机制研究前沿和菌根修复技术的应用前景进行展望。Abstract: Arbuscular mycorrhizal fungi (AMF) is a group of ubiquitous fungi that can establish symbiosis with most terrestrial plants. AM symbiosis can improve plant growth and affect heavy metal (HM) uptake and accumulation by plants under HM contaminations, for which AMF is considered to be greatly valuable in phytoremediation of HM contaminated soils. Based on the main line of HM translocation from rhizosphere soil to plant roots and subsequent partitioning in plants, this paper introduced the influences of AMF on HM environmental behavior during these processes, with focus on the mycorrhizal effects on heavy metal speciation in rhizosphere and the specific role of AMF in heavy metal uptake by plants. Finally, future studies on mechanisms underlying mycorrhizal effects on heavy metal tolerance and potential use of AMF for soil remediation were proposed.
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Key words:
- arbuscular mycorrhizal fungi /
- heavy metal /
- plant /
- translocation
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