Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province, Interdisciplinary Research Academy (IRA), Zhejiang Shuren University, Hangzhou, 310015, China.
College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China.
Chemosphere. 2023 Oct;338:139475. doi: 10.1016/j.chemosphere.2023.139475. Epub 2023 Jul 11.
Phytoremediation is an environment-friendly approach regarded as a potential candidate for remediating heavy metal (HM)-contaminated soils. However, the low efficacy of phytoremediation is a major limitation that hampers its large-scale application. Therefore, developing strategies to enhance phytoremediation efficacy for contaminated soils is crucial. Plant growth-promoting rhizobacteria (PGPR) considerably contribute to phytoremediation intensification. To improve the efficiency of plant-microbe symbiosis for remediation, the mechanisms underlying PGPR-stimulated HM accumulation and tolerance in plants should be comprehensively understood. This review focuses on hyperaccumulators, PGPR, and the mechanisms by which PGPR enhance phytoremediation from four aspects: providing nutrients to plants, secreting plant hormones and specific enzymes, inducing systemic resistance, and altering the bioavailability of HMs in soils. It also provides a theoretical and technical basis for future research on PGPR synergism in promoting the phytoextraction efficiency in HM-contaminated soils.
植物修复被视为一种环境友好型方法，可用于修复重金属（HM）污染土壤。然而，植物修复效率低是其大规模应用的主要限制因素。因此，开发提高污染土壤植物修复效率的策略至关重要。植物促生根际细菌（PGPR）对植物修复的强化作用非常显著。为了提高植物-微生物共生修复的效率，应全面了解 PGPR 刺激植物中 HM 积累和耐受的机制。本综述从提供植物养分、分泌植物激素和特定酶、诱导系统抗性以及改变土壤中 HM 的生物利用度四个方面重点讨论了超积累植物、PGPR 以及 PGPR 增强植物修复的机制。这也为未来研究 PGPR 协同作用以提高 HM 污染土壤的植物提取效率提供了理论和技术基础。
