Molecular and eco-physiological responses of soil-borne lead (Pb2+)-resistant bacteria for bioremediation and plant growth promotion under lead stress

IF 6.1 1区 生物学 Q1 MICROBIOLOGY
Priyanka Pal , Krishnendu Pramanik , Sudip Kumar Ghosh , Sayanta Mondal , Tanushree Mondal , Tithi Soren , Tushar Kanti Maiti
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Abstract

Lead (Pb) is the 2nd known portentous hazardous substance after arsenic (As). Being highly noxious, widespread, non-biodegradable, prolonged environmental presence, and increasing accumulation, particularly in arable land, Pb pollution has become a serious global health concern requiring urgent remediation. Soil-borne, indigenous microbes from Pb-polluted sites have evolved diverse resistance strategies, involving biosorption, bioprecipitation, biomineralization, biotransformation, and efflux mechanisms, under continuous exposure to Pb in human-impacted surroundings. These strategies employ a wide range of functional bioligands to capture Pb and render it inaccessible for leaching. Recent breakthroughs in molecular technology and understanding of lead resistance mechanisms offer the potential for utilizing microbes as biological tools in environmental risk assessment. Leveraging the specific affinity and sensitivity of bacterial regulators to Pb2+ ions, numerous lead biosensors have been designed and deployed worldwide to monitor Pb bioavailability in contaminated sites, even at trace levels. Besides, the ongoing degradation of croplands due to Pb pollution poses a significant challenge to meet the escalating global food demands. The accumulation of Pb in plant tissues jeopardizes both food safety and security while severely impacting plant growth. Exploring Pb-resistant plant growth-promoting rhizobacteria (PGPR) presents a promising sustainable approach to agricultural practices. The active associations of PGPR with host plants have shown enhancements in plant biomass and stress alleviation under Pb influence. They thus serve a dual purpose for plants grown in Pb-contaminated areas. This review aims to offer a comprehensive understanding of the role played by Pb-resistant soil-borne indigenous bacteria in expediting bioremediation and improving the growth of Pb-challenged plants essential for potential field application, thus broadening prospects for future research and development.

抗土壤中铅(Pb2+)细菌在铅胁迫下进行生物修复和促进植物生长的分子和生态生理反应
铅(Pb)是继砷(As)之后已知的第二大有害物质。铅污染具有剧毒性、广泛性、不可生物降解性、长期存在于环境中以及日益积累(尤其是在耕地中)等特点,已成为一个严重的全球健康问题,亟需采取补救措施。在受人类影响的环境中持续暴露于铅的情况下,来自铅污染地区的土生土长的微生物进化出了多种抗性策略,包括生物吸附、生物沉淀、生物矿化、生物转化和外排机制。这些策略利用各种功能性生物配体来捕获铅,使其无法被沥滤。分子技术的最新突破和对铅抗性机理的了解为利用微生物作为环境风险评估的生物工具提供了可能。利用细菌调节剂对铅离子的特异性亲和力和灵敏度,全球已设计并部署了大量铅生物传感器,用于监测受污染场地的铅生物利用率,甚至是痕量水平。此外,铅污染导致耕地不断退化,这对满足全球不断增长的粮食需求构成了重大挑战。铅在植物组织中的积累既危及食品安全,又严重影响植物生长。探索抗铅植物生长促进根瘤菌(PGPR)为农业实践提供了一种前景广阔的可持续方法。PGPR 与寄主植物的积极结合表明,在铅的影响下,植物的生物量会增加,压力会减轻。因此,它们对在铅污染地区种植的植物具有双重作用。本综述旨在全面介绍耐铅土生细菌在加快生物修复和改善受铅污染植物的生长方面所发挥的作用,这些作用对于潜在的实地应用至关重要,从而为未来的研究和开发开辟了广阔的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Microbiological research
Microbiological research 生物-微生物学
CiteScore
10.90
自引率
6.00%
发文量
249
审稿时长
29 days
期刊介绍: Microbiological Research is devoted to publishing reports on prokaryotic and eukaryotic microorganisms such as yeasts, fungi, bacteria, archaea, and protozoa. Research on interactions between pathogenic microorganisms and their environment or hosts are also covered.
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