Microbial Indicator of Iron Cycling in Riverwater-Groundwater Interaction Zone-FMN Reductase Gene
Huang Yingyun
Sheng Junhao
Zhu Zichao
Mao Shengjun
Liu Hui
Abstract：Flavin mononucleotide(FMN)reductases are important enzymes secreted by microorganisms to facilitate iron oxidation and reduction through electron transfer.In order to explore the feasibility of using FMN reductase genes as indicators of iron cycling microbes,in this study it focused on the interaction zone at the lower reaches of Han River as the research area.In the study it investigated the distributional correlations of different forms Fe,representative iron-cycling microorganisms,and the relative abundance of FMN reductase genes in sediments from three differently characterized riverwater-groundwater interaction zone profiles.The results indicate that(1)Fe(Ⅱ)accumulates in the area below the water table closer to the river,while Fe(Ⅲ)mainly accumulates in the area at the water table line or farther away from the river;(2)iron cycling microbes and FMN reductases were mainly distributed in the areas below the groundwater level close to the river bank or around the water level,with different areas of aggregation for different iron cycling bacteria;(3)there was a significant positive correlation between the total abundance of iron cycling microbes and FMN reductase genes.These findings validate the feasibility of using FMN reductase genes as indicators of iron cycling microbes.
Keywords：interactive zonedifferent forms of ironiron cycling microorganismFMN reductasehydrogeologygeochemistry
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1575-1584 )