Distribution Pattern and Influencing Factors of Heavy Metal Resistance Genes in the Yellow River Sediments of Henan Section

Abstract

The transformation of heavy metal resistance genes (MRGs) in the environment has attracted increasing attention in recent years. However, few studies have reported the MRG content in the Yellow River, one of the main irrigation water sources in the North China Plain. In this study, we quantified MRG abundance by a metagenomic approach, and assessed the influence on MRGs of both bioavailable and total heavy metal (HM) content. The results indicate that Cu-resistant genes are the most common genes, and the prevalence of arsM needs more attention. Comamonadaceae is the dominant family in the Yellow River, and the presence of organic pollutants may contribute to the prevalence of Vicinamibacteraceae, Nocardioidaceae, and Flavobacteriacea. The results of the Mantel test and Spearman analysis indicate that both the bioavailable fractions and total content of HMs could have little influence on MRGs. Network analysis results indicate that some dominant bacteria could be the potential hosts of some prevalent MRGs, which may exert an adverse impact on human health.

Assembly processes of bacterial and fungal communities in metal(loid)s smelter soil

“…For example, three OTUs associated with Comamonadaceae showed positive relationships with the bioavailable Fe, Cr, and Ni. Members of Comamonadaceae have been identified as Fe(III)-reducing bacteria, which could adapt to the detrimental environment by changing their metabolic ways Zhang et al, 2022a). Consistently, two OTUs associated with Rhodocyclaceae showed positive relationships with the bioavailable Fe and Cr.…”

Nitrogen Application and Rhizosphere Effect Exert Opposite Effects on Key Straw-Decomposing Microorganisms in Straw-Amended Soil

“…Streptomyces has been reported to have strong capabilities for cellulose and hemicellulose decomposition [ 54 ], as well as nitrogen-fixing [ 55 ] and antibiotic synthesis [ 56 ]. Vicinamibacteraceae , the first family within the sd6 Acidobacteria [ 57 ] which has been found to contain butyrogenic degradation-related genes and to prefer to utilize complex organic compounds [ 58 ], was found to be one of the most abundant microorganisms in the area surrounding our sample sites [ 59 ]. Penicillium and Aspergillus were found to play a role in straw degradation in previous 13 C-labeled straw decomposition experiments [ 22 ], and microbial physiological studies have revealed that they have cellulolytic enzymes and xylanase synthesis systems.…”