Microbial diversity and community assembly in heavy metal-contaminated soils: insights from selenium-impacted mining areas

Frontiers in Microbiology, Journal Year: 2025, Volume and Issue: 16

Published: April 14, 2025

The mining industry in China plays a pivotal role economic development but also leads to severe environmental issues, particularly heavy metal pollution soils. Heavy significantly impacts soil microbial communities due its persistence and long-term residual effects. We assessed changes diversity, community structure, assembly mechanisms selenium-impacted This study investigates the of selenium (Se) other metals on selenium-rich areas using full-length 16S rRNA gene sequencing. Our results showed that Se contamination altered composition, favoring metal-tolerant phyla such as Proteobacteria, Actinobacteriota Firmicutes, while reducing abundance sensitive groups like Acidobacteriota Chloroflexi. Microbial diversity decreased concentrations increased. Mantel test analysis revealed total potassium (TK), organic carbon, nitrogen, several metals, including zinc, niobium, titanium (Ti), manganese, rubidium, barium, potassium, cobalt, gallium (Ga), Se, chromium (Cr), vanadium, copper were positively correlated with composition across all samples. Random forest TK multiple elements [Cr, Ti, nickel (Ni), Ga Se] most important predictors bacterial emphasizing shaping communities. Co-occurrence network reduced complexity stability, high Se-contaminated soils exhibiting fragmented networks. Community was primarily driven by drift control soils, whereas dispersal limitation became more prominent toxicity. These findings highlight ecological consequences offer valuable insights for effective management remediation strategies.

Language: Английский

Selenium: The Toxicant for Pathogen and Pest but the Guardian of Soil and Crop

Journal of Agricultural and Food Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

Selenium (Se) is an essential micronutrient for higher organisms and plays a beneficial role in plant growth development. In recent years, there has been growing interest the using of Se to enhance resilience, particularly mitigating effects diseases pests agricultural systems. This review offers comprehensive analysis sources chemical forms soil, investigates mechanisms uptake metabolism different forms, evaluates physical inhibition pathogens by various as well enhancing systemic resistance crop protection. Additionally, we summarize current research on pest disease control explore potential future directions, with focus integrating into sustainable practices. The insights presented this seek establish solid scientific foundation Se-based approaches emphasize its application agriculture.

Language: Английский

Bioremediation Potential of Rhodococcus qingshengii PM1 in Sodium Selenite-Contaminated Soil and Its Impact on Microbial Community Assembly

Microorganisms, Journal Year: 2024, Volume and Issue: 12(12), P. 2458 - 2458

Published: Nov. 29, 2024

Soil microbial communities are particularly sensitive to selenium contamination, which has seriously affected the stability of soil ecological environment and function. In this study, we applied high-throughput 16S rRNA gene sequencing examine effects low high doses sodium selenite selenite-degrading bacterium, Rhodococcus qingshengii PM1, on bacterial community composition, diversity, assembly processes under controlled laboratory conditions. Our results indicated that strain PM1 were key predictors structure in selenium-contaminated soils. Exposure initially led reductions diversity a shift dominant groups, an increase Actinobacteria decrease Acidobacteria. Sodium significantly reduced simplified co-occurrence networks, whereas inoculation with partially reversed these by enhancing complexity. Ecological modeling, including normalized stochasticity ratio (NST) Sloan’s neutral model (NCM), suggested stochastic predominated stress. Null analysis further revealed heterogeneous selection drift primary drivers turnover, promoting species dispersal buffering against negative impacts selenium. These findings shed light mechanisms contamination highlight potential for bioremediation selenium-affected

Language: Английский