【摘要】 产铁载体根际菌(siderophore-producing rhizobacteria,SPR)是一类植物根际促生菌,在植物修复重金属污染土壤中可起重要的辅助作用.本文在综合分析国内外相关研究进展的基础上,阐述了SPR缓解重金属植物胁迫毒害的功能及其提高土壤重金属生物活性的机理,并指出SPR在促进重金属污染土壤中植物的生长、增强植物累积重金属的过程等方面具有较好的应用潜力.对当前研究中存在的SPR提高或降低植物累积重金属的矛盾现象也进行了分析.针对当前研究存在的不足,提出今后应深入研究SPR与植物(尤其是重金属超累积植物)之间的相互作用机理,进一步明确影响铁载体螯合、活化土壤重金属的关键因素,综合考虑铁载体对土壤重金属生物活性和对植物吸收重金属的影响,探索在重金属污染土壤中提高SPR定殖能力的强化方法.更多还原

【Abstract】 Siderophore-producing rhizobacteria(SPR) are a group of plant growth-promoting rhizobacteria,being able to play an important role in assisting the phytoremediation of heavy metals-contaminated soils.Based on the comprehensive analysis of related researches at home and abroad,this paper elaborated the functions of SPR in alleviating the heavy metals stress and toxicity to plants and the mechanisms of SPR in improving the heavy metals bioavailability in soil,and indicated that SPR had good application potential in promoting the plant growth in heavy metals-contaminated soils and reinforcing the heavy metals accumulation in plants.The contradictory phenomena of SPR in increasing or decreasing heavy metals accumulation in plants,which existed in current researches,were also analyzed.Aiming at the deficiencies in current researches,it was suggested that in the future researches,the mechanisms of the interactions between SPR and plants,especially hyperaccumulators,should be further studied,the key factors affecting the heavy metals complexation and mobilization in soil by siderophores should also be further clarified,the effects of siderophores on the heavy metals bioavailability and its subsequent influence on the heavy metals uptake by plants should be comprehensively considered,and the measures for improving the colonization of SPR in heavy metals-contaminated soil should be explored.更多还原