植物根际促生菌在重金属污染土壤修复中的应用

Application of Plant Growth Rhizobacteria in the Remediation of Heavy Metal Contaminated Soils

传统重金属解毒方法产生大量毒性产物且成本高,生物修复技术可避免上述缺点。与传统农业相比,污染区金属耐受性植物根际促生菌能更好地维持土壤肥力。除具有金属解毒和移除作用外,根际菌还可产生益生物质和铁载体等促进植物生长。植物修复是一种新兴的低成本原位修复技术,适宜的重金属耐受性植物根际促生菌可提高植物修复的效率。对农业生态条件下植物根际促生菌在重金属污染土壤修复中的最新成果作一综述,使其更好地提高作物产量。

Conventional methods used for metal detoxification produce large quantities of toxic products and are costeffective. Bioremediation technology has provided an alternative to conventional methods for remediating the metal-poisoned soils. In metal-contaminated soils, the role of metal-tolerant plant growth promoting rhizobacteria in maintaining soil fertility is more important than in conventional agriculture. Besides their role in metal detoxification and removal, rhizobacteria also promote the growth of plants by producing growth promoting substances and siderophores. Phytoremediation is an emerging lowcost in situ technology and the efficiency of phytoremediation can be enhanced by appropriate heavy-metal tolerant plant growth promoting rhizobacteria. This review presents the results of studies on the utilization of plant growth promoting rhizobacteria in remediating the metal-poisoned soils under agro-ecological conditions and promote crop productivity.