<i>Acidiphilium</i>

Hiraishi, Akira; Imhoff, Johannes F.

doi:10.1002/9781118960608.gbm00877

Cited by 14 publications

(13 citation statements)

References 42 publications

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“…In the case of Acetobacterales, Acidiphilium is among the most abundant taxa. The genus consists of aerobic bacteria with photosynthetic pigments, with a pH range that matches well to the pH of beech bark (∼4.4 in Asplund et al, 2015) and that do not overlap in metabolic demands with Methylocella (Hiraishi and Imhoff, 2015).…”

Section: Discussionmentioning

confidence: 99%

Tree size drives diversity and community structure of microbial communities on the bark of beech (Fagus sylvatica)

Dreyling

Schmitt

Grande

2022

Preprint

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Tree bark constitutes ideal habitat for microbial communities, because it is a stable substrate, rich in micro-niches. Bacteria, fungi, and terrestrial microalgae together form microbial communities, which in turn support more bark-associated organisms, such as mosses, lichens, and invertebrates, thus contributing to forest biodiversity. We have a limited understanding of the diversity and biotic interactions of the bark-associated microbiome, as investigations have mainly focussed on agriculturally relevant systems and on single taxonomic groups. Here we implemented a multi-kingdom metabarcoding approach to analyse diversity and community structure of the green algal, bacterial, and fungal components of the bark-associated microbial communities of beech, the most common broadleaved tree of Central European forests. We identified the most abundant taxa, hub taxa, and co-occurring taxa. We found that tree size (as a proxy for age) is an important driver of community assembly, suggesting that environmental filtering leads to less diverse fungal and algal communities over time. Conversely, forest management intensity had negligible effects on microbial communities on bark. Our study suggests the presence of undescribed, yet ecologically meaningful taxa, especially in the fungi, and highlights the importance of bark surfaces as a reservoir of microbial diversity. Our results constitute a first, essential step towards an integrated framework for understanding microbial community assembly processes on bark surfaces, an understudied habitat and neglected component of terrestrial biodiversity. Finally, we propose a cost-effective sampling strategy to study bark-associated microbial communities across large spatial or environmental scales.

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Section: Discussionmentioning

confidence: 99%

Tree size drives diversity and community structure of microbial communities on the bark of beech (Fagus sylvatica)

Dreyling

Schmitt

Grande

2022

Preprint

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“…We hypothesized that the warming‐induced increase in labile B. nana litter (Jonsdottir et al ., 2005) would lead to a decrease in slow‐growing, more oligotrophic taxa, while fast‐growing copiotrophic taxa would increase in relative abundance. Our data indicate a decrease in the relative abundance of oligotrophic taxa in response to warming, such as Acidobacteria (and more specific ASVs of the genera Granulicella , Solibacter , Bryocella , Bryobacter and Acidipila ) (Fierer et al ., 2007; Dedysh & Sinninghe Damsté, 2018) and the Alphaproteobacterial genus Acidiphilium (Hiraishi & Imhoff, 2015). Acidobacteria often dominate tundra soils (Männistö et al ., 2013), especially those environments with high concentrations of phenolic compounds (e.g.…”

Section: Discussionmentioning

confidence: 99%

Long‐term warming effects on the microbiome andnifHgene abundance of a common moss species in sub‐Arctic tundra

et al. 2021

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Bacterial communities form the basis of biogeochemical processes and determine plant growth and health. Mosses harbour diverse bacterial communities that are involved in nitrogen fixation and carbon cycling. Global climate change is causing changes in aboveground plant biomass and shifting species composition in the Arctic, but little is known about the response of moss microbiomes in these environments.Here, we studied the total and potentially active bacterial communities associated with Racomitrium lanuginosum in response to a 20-yr in situ warming in an Icelandic heathland. We evaluated the effect of warming and warming-induced shrub expansion on the moss bacterial community composition and diversity, and nifH gene abundance.Warming changed both the total and the potentially active bacterial community structure, while litter abundance only affected the total bacterial community structure. The abundance of nifH genes was negatively affected by litter abundance. We also found shifts in the potentially nitrogen-fixing community, with Nostoc decreasing and noncyanobacterial diazotrophs increasing in relative abundance.Our data suggest that the moss microbial community and potentially nitrogen fixing taxa will be sensitive to future warming, partly via changes in litter and shrub abundance.

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“…There are species capable of chemolithoautotrophic growth, ferric iron reduction in anaerobic conditions and arsenite oxidation; but probably the most surprising treat is the production of photopigments with zinc-chelated bacteriochlorophyll (Zn-BChl) that are much more stable in acidic conditions than other photopigments ( [34], [35]). Even though there is no evidence of actual photosynthetic growth in Acidiphilium, considering that they develop mostly in acidic low carbon environments, such ability may be an adaptation that would help explain its survival in hostile conditions ( [34], [35]). Acidiphilium participation in the biogeochemical iron cycle is associated with the reduction of ferric iron in oxic-anoxic interfaces regenerating ferrous iron that can be used by iron oxidising species.…”

Section: Resultsmentioning

confidence: 99%

First description of the microbial diversity in the Amarillo River (La Rioja, Argentina); a natural extreme environment where the whole microbial community paints the landscape yellow

Bernardelli,

Colman,

Donati

et al. 2023

Preprint

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Background. The Amarillo River is an acidic river located in the mining district of Famatina, La Rioja, Argentina, named after the vast yellow-ochreous iron precipitates deposited all through its course. Even though the area has been exploited for metals extraction, the waters of the river are naturally acidic due to environmental factors beyond mineralogy, where microbial species have a crucial role. Iron-oxidizing bacteria have been identified, however a comprehensive analysis of the entire microbial community in this extreme environment has not been conducted. In this work we explore, for the first time using high-throughput sequencing, the bacterial as well as the so long neglected fungal diversity in the Amarillo River and the Cueva de Pérez terraces, considered the prehistoric analogues of the current river basin. Furthermore, we attempt to untangle the ecological relations between bacteria and fungi using co-occurrence and network analysis. Fe(II)-enrichment cultures at different temperature and nutritional conditions, mimicking different environmental settings of the river, were also analysed to better understand the roles of prokaryotes and fungi in iron oxidation processes.Results. The findings highlight the presence of a diverse bacterial community in the river as well as the terraces, with a marked presence of uncultured Acidimicrobiia also found in other acidic environments and apparently part of a yet uncharacterised universal microbial acidic diversity. Acidophiles and iron-oxidising species, despite being in low abundances in the environmental samples, constitute the core of the microbial community, showing significant involvement in intraspecies interactions. Moreover, both environmental samples and enrichment cultures exhibit a wide diversity of fungi, highly connected with bacteria according to network analysis.Conclusions. Through the utilization of 16S-amplicon sequencing, Venn diagrams and co-occurrence networks, this work has shaded light into the intricate connections between bacterial and fungal communities of the Amarillo River. The occurrence of certain acidophiles within both the river and the ancient terraces indicates their enduring significance in the environment’s iron cycle as well as the flexibility of the system. These findings reinforce the importance of the microbial community as fundamental geological agents in the Amarillo River where their collaborative work in the precipitation of iron minerals paint the landscape yellow.

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Acidiphilium

Cited by 14 publications

References 42 publications

Tree size drives diversity and community structure of microbial communities on the bark of beech (Fagus sylvatica)

Tree size drives diversity and community structure of microbial communities on the bark of beech (Fagus sylvatica)

Long‐term warming effects on the microbiome andnifHgene abundance of a common moss species in sub‐Arctic tundra

First description of the microbial diversity in the Amarillo River (La Rioja, Argentina); a natural extreme environment where the whole microbial community paints the landscape yellow

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