Response of Fe(III)-reducing kinetics, microbial community structure and Fe(III)-related functional genes to Fe(III)-organic matter complexes and ferrihydrite in lake sediment

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Tingyang Shi, Chao Peng, Lu Lu, Zhen Yang, Yundang Wu, Zimeng Wang, Andreas Kappler
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Abstract

Microbial Fe(III) reduction significantly influences the fate of various elements and contaminants. Previous research has employed different Fe(III)-OM complexes and ferrihydrite to study Fe(III)-reduction-related biogeochemistry processes. However, the effects of adding specific Fe(III)-OM complexes and ferrihydrite on the Fe(III)-reducing bacterial community, Fe(III)-reducing kinetics, and Fe(III)-related functional genes remain largely unexplored. This study applied microcosm experiments and metagenomic analysis of lake sediments with and without amendments of ferrihydrite, Fe(III)-citrate, or Fe(III)-EDTA. Results showed that sediments amended with Fe(III)-citrate and Fe(III)-EDTA exhibited faster Fe(III) reduction rates and more significant changes in bacterial community structures compared to those amended with ferrihydrite. Geobacter and Clostridium were enriched in the sediments amended with Fe(III)-EDTA and Fe(III)-citrate, respectively. Despite a slower reduction rate and lack of enrichment of specific Fe(III)-reducing bacteria, ferrihydrite still led to an increase in the copy numbers of genes related to Fe(III) reduction and iron assimilation in the metagenomes, suggesting an increase in these capacities. These results suggest that introducing various Fe(III)-OM complexes and ferrihydrite into the environment would result in differences in not only Fe(III) reduction rates and Fe(III)-reducing bacterial communities but also in iron-related functional genes. Meanwhile, variations in Fe(III) reduction rates and Fe(III)-reducing bacterial communities do not necessarily correlate with changes in the abundances of functional genes relevant to Fe(III) reduction and iron assimilation in the metagenomes. These results provide a better understanding of the adaptive mechanisms of Fe(III)-reducing bacteria in different environmental systems.

Abstract Image

湖泊沉积物中铁(III)还原动力学、微生物群落结构和铁(III)相关功能基因对铁(III)-有机物复合物和亚铁酸盐的响应
微生物的铁(III)还原作用对各种元素和污染物的归宿有着重大影响。以往的研究采用了不同的铁(III)-OM 复合物和亚铁来研究与铁(III)还原相关的生物地球化学过程。然而,添加特定的 Fe(III)-OM 复合物和亚铁酸盐对 Fe(III)还原细菌群落、Fe(III)还原动力学和 Fe(III)相关功能基因的影响在很大程度上仍未得到探讨。本研究对添加和未添加亚铁酸盐、柠檬酸铁或乙二胺四乙酸铁的湖泊沉积物进行了微宇宙实验和元基因组分析。结果表明,与添加铁水盐的沉积物相比,添加柠檬酸铁(III)和乙二胺四乙酸铁(III)的沉积物的铁(III)还原速度更快,细菌群落结构的变化也更显著。用柠檬酸铁(III)-EDTA 和柠檬酸铁(III)-EDTA 处理过的沉积物中分别富集了革兰氏菌和梭状芽孢杆菌。尽管铁酸盐的还原速度较慢,也没有富集特定的铁(III)还原细菌,但铁酸盐仍导致元基因组中与铁(III)还原和铁同化有关的基因拷贝数增加,表明这些能力有所提高。这些结果表明,在环境中引入各种铁(III)-OM 复合物和铁酸盐不仅会导致铁(III)还原率和铁(III)还原细菌群落的差异,还会导致与铁有关的功能基因的差异。同时,Fe(III)还原率和Fe(III)还原细菌群落的变化并不一定与元基因组中与Fe(III)还原和铁同化相关的功能基因丰度的变化相关。这些结果有助于更好地了解不同环境系统中铁(III)还原细菌的适应机制。
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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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