Responses of rhizosphere microbial community structure and metabolic function to heavy metal coinhibition

Metal mineral mining results in releases of large amounts of heavy metals into the environment, and it is necessary to better understand the response of rhizosphere microbial communities to simultaneous stress from multiple heavy metals (HMs), which directly impacts plant growth and human health. In...

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Published in:	Environmental geochemistry and health 2023-08, Vol.45 (8), p.6177-6198
Main Authors:	Jiao, Ganghui, Huang, Yi, Dai, Hao, Gou, Hang, Li, Zijing, Shi, Huibin, Yang, Jinyan, Ni, Shijun
Format:	Article
Language:	eng
Subjects:	Analysis Bacteria Bioavailability Cadmium Chemical properties Chemicophysical properties Chromium Community structure Corn Earth and Environmental Science Environment Environmental Chemistry Environmental Health Environmental information Geochemistry Heavy metals Information processing Jointing Lysozyme Metabolic pathways Metabolism Metagenomics Microbial activity Microbiomes Microorganisms Network analysis Next-generation sequencing Original Paper Plant growth Public Health Rhizosphere Rhizosphere microorganisms Soil Soil chemistry Soil microorganisms Soil properties Soil remediation Soil Science & Conservation Soils Structure-function relationships Survival Terrestrial Pollution Vanadium
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Summary:	Metal mineral mining results in releases of large amounts of heavy metals into the environment, and it is necessary to better understand the response of rhizosphere microbial communities to simultaneous stress from multiple heavy metals (HMs), which directly impacts plant growth and human health. In this study, by adding different concentrations of cadmium (Cd) to a soil with high background concentrations of vanadium (V) and chromium (Cr), the growth of maize during the jointing stage was explored under limiting conditions. High-throughput sequencing was used to explore the response and survival strategies of rhizosphere soil microbial communities to complex HM stress. The results showed that complex HMs inhibited the growth of maize at the jointing stage, and the diversity and abundance of maize rhizosphere soil microorganisms were significantly different at different metal enrichment levels. In addition, according to the different stress levels, the maize rhizosphere attracted many tolerant colonizing bacteria, and cooccurrence network analysis showed that these bacteria interacted very closely. The effects of residual heavy metals on beneficial microorganisms (such as Xanthomonas, Sphingomonas, and lysozyme) were significantly stronger than those of bioavailable metals and soil physical and chemical properties. PICRUSt analysis revealed that the different forms of V and Cd had significantly greater effects on microbial metabolic pathways than all forms of Cr. Cr mainly affected the two major metabolic pathways: microbial cell growth and division and environmental information transmission. In addition, significant differences in rhizosphere microbial metabolism under different concentrations were found, and this can serve as a reference for subsequent metagenomic analysis. This study is helpful for exploring the threshold for the growth of crops in toxic HM soils in mining areas and achieving further biological remediation.
ISSN:	0269-4042 1573-2983