根际促生菌及其在污染土壤植物修复中的应用

植物对重金属吸收、转运和积累以及植物生物学特征使其成为修复重金属污染土壤的重要手段之一。然而，由于植物对重金属的耐受性有限而限制其广泛实际应用，因而探讨植物修复技术强化措施就显得尤为重要。随着自然资源的开发和技术的发展，微生物调控使植物修复技术变得更为可行和更有价值。回顾近年来新兴的微生物调控技术，植物根际促生菌资源因其对环境无污染，可利用自身的抗性系统减缓重金属对植物的毒性，促进植物的生长和影响重金属的迁移等优势，在修复过程中发挥着重要作用。目前，国内外就植物根际促生菌的筛选、鉴定和应用价值等方面已经做了大量的相关研究。本文综述了根际促生菌-植物相互作用的机制及其促进植物修复重金属污染土壤的作用原理。

Plant growth promoting rhizobacteria and their role in phytoremediation of heavy metal contaminated soils

The potential of plants to absorb, translocate and accumulate heavy metals and their biology characteristics makes them one of perfect choicesSfor heavy metal remediation. However, it is important to discover some strengthening measures for phytoremediation, considering its limits of tolerance to heavy metals for practical applications. With the development in natural resources and the technologies, microbial regulation makes phytoremediation more viable and more valuable. Reviewing emerging microbial technology in recent years, plant growth promoting rhizobacteria (PGPR) have been applied as environmentally friendlySalternatives and play a significant role in phytoremediation process, due to their abilities to alleviate heavy metal phytotoxicity, to promote plant growth and to influence the migration capacity of metals. Currently, great researches have been done on the screening, identification and application of PGPR. This article aims to review the interactions between plants and PGPR, and their potential mechanisms used to accelerate phytoremediation of heavy metal polluted soils.