Nutrient Acquisition and the Metabolic Potential of Photoferrotrophic Chlorobi

Thompson, Katherine Jenny; Simister, Rachel L.; Hahn, Aria S.; Hallam, Steven J.; Crowe, Sean A.

doi:10.3389/fmicb.2017.01212

Cited by 31 publications

(26 citation statements)

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“…The RDA analysis agreed with the fact that many species belonged to Cyanobacteria and Chlorobi are capable of nitrogen fixation to support primary production [49,50]. The high composition of Cyanobacteria and Chlorobi in the FFD pond suggested that the nitrogen removal was mainly performed through nitrogen fixation.…”

Section: Correlations Between Water Quality and Microbial Communitysupporting

confidence: 74%

Feed Types Driven Differentiation of Microbial Community and Functionality in Marine Integrated Multitrophic Aquaculture System

Deng

Zhou

Ruan

et al. 2019

Water

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Integrated multi trophic aquaculture (IMTA) improves the production of aquatic animals by promoting nutrient utilization through different tropical levels. Microorganisms play an important role in elements cycling, energy flow and farmed-species health. The aim of this study was to evaluate how feed types, fresh frozen fish diet (FFD) or formulated diet (FD), influence the microbial community diversity and functionality in both water and sediment in a marine IMTA system. Preferable water quality, higher animal yields and higher cost efficiency were achieved in the FD pond. Feed types changed the pond bacterial community distribution, especially in the rearing water. The FFD pond was dominated with Cyanobacteria in the water, which played an important role in nitrogen fixation through photosynthesis due to the high nitrogen input of the frozen fish diet. The high carbohydrate composition in the formulated diet triggered higher metabolic pathways related to carbon and lipid metabolism in the water of the FD pond. Sediment had significantly higher microbial diversity than the rearing water. In sediment, the dominating genus, Sulfurovum and Desulfobulbus, were found to be positively correlated by network analysis, which had similar functionality in sulfur transformation. The relatively higher rates of antibiotic biosynthesis in the FFD sediment might be related to the pathogenic bacteria introduced by the trash fish diet. The difference in microbial community composition and metabolic pathways may be associated with the different pathways for nutrient cycling and animal growth performance. The formulated diet was determined to be more ecologically and economically sustainable than the frozen fish diet for marine IMTA pond systems.

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Section: Correlations Between Water Quality and Microbial Communitysupporting

confidence: 74%

Feed Types Driven Differentiation of Microbial Community and Functionality in Marine Integrated Multitrophic Aquaculture System

Deng

Zhou

Ruan

et al. 2019

Water

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“…All isolated photoferrotrophs from the green sulfur bacteria belong to the genus Chlorobium. These include Chlorobium ferrooxidans strain KoFox (Heising et al, 1999) and two recently isolated species: Chlorobium phaeoferrooxidans Thompson et al, 2017) and Chlorobium sp. strain N1 which is closely related to Chlorobium luteolum (Laufer et al, 2017).…”

Section: Physiology Existing Isolates/cultures and Ecologymentioning

confidence: 99%

Microbial anaerobic Fe(II) oxidation – Ecology, mechanisms and environmental implications

Bryce

Blackwell

Schmidt

et al. 2018

Environmental Microbiology

211

123

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Iron is the most abundant redox-active metal in the Earth's crust. The one electron transfer between the two most common redox states, Fe(II) and Fe(III), plays a role in a huge range of environmental processes from mineral formation and dissolution to contaminant remediation and global biogeochemical cycling. It has been appreciated for more than a century that microorganisms can harness the energy of this Fe redox transformation for their metabolic benefit. However, this is most widely understood for anaerobic Fe(III)-reducing or aerobic and microaerophilic Fe(II)-oxidizing bacteria. Only in the past few decades have we come to appreciate that bacteria also play a role in the anaerobic oxidation of ferrous iron, Fe(II), and thus can act to form Fe(III) minerals in anoxic settings. Since this discovery, our understanding of the ecology of these organisms, their mechanisms of Fe(II) oxidation and their role in environmental processes has been increasing rapidly. In this article, we bring these new discoveries together to review the current knowledge on these environmentally important bacteria, and reveal knowledge gaps for future research.

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“…It is believed that before reduced sulfur compounds accumulated, ferrous ion (Fe 2+ ) was used as electron donor. For example, ferrous ion functions as the electron source in type 1 photosystem in some green sulfur bacteria, also known as Chlorobi, such as Chlorobium ferrooxidans , as well as in type 2 photosystem found in some purple nonsulfur bacteria . There is some evidence that biological Fe 2+ oxidation took place approximately 3.77 Ga ago , but whether it was by photooxidation is still unknown.…”

Section: Photosystemsmentioning

confidence: 99%