Environmental Microbiology Reports最新文献_第2页

Contrasting Responses of Oceanic and Coastal Synechococcus to Iron Limitation and Warming Interactions 海洋和海岸聚球菌对铁限制和增温相互作用的响应对比

IF 3.6 4区生物学

Environmental Microbiology Reports Pub Date : 2025-07-18 DOI: 10.1111/1758-2229.70158

Ran Duan, Min Xu, Xiaopeng Bian, Conner Y. Kojima, Shengwei Hou, Qiang Zheng, Seth G. John, David A. Hutchins, Fei-Xue Fu

{"title":"Contrasting Responses of Oceanic and Coastal Synechococcus to Iron Limitation and Warming Interactions","authors":"Ran Duan, Min Xu, Xiaopeng Bian, Conner Y. Kojima, Shengwei Hou, Qiang Zheng, Seth G. John, David A. Hutchins, Fei-Xue Fu","doi":"10.1111/1758-2229.70158","DOIUrl":"https://doi.org/10.1111/1758-2229.70158","url":null,"abstract":"This study explored the contrasting physiological and transcriptional responses to iron (Fe) and warming temperature interactions in two South China Sea Synechococcus isolates belonging to clade II from the open ocean and CB5 from the coastal ocean. The two picocyanobacterial strains utilised contrasting photosynthesis, Fe uptake, and nutrient acquisition strategies to cope with Fe limitation. In the oceanic strain, moderate warming under Fe limitation upregulated expression of photosynthesis and nutrient and Fe transport genes, increasing its growth and photosynthesis. In contrast, gene expression under low Fe in the coastal strain was less affected by warming. The oceanic isolate exhibited substrate regulation of Fe acquisition and preferred organic nutrient sources. The coastal strain had a much higher Fe quota, faster turnover of the D1 gene in photosystem II, and was optimised for inorganic nitrogen sources. Both strains showed multi-tiered Fe uptake strategies and general stress responses to heat shock and oxidative stress. In general, gene regulation in the oceanic strain responded more effectively to both stressors than in the coastal isolate. Fe-temperature interactions in both strains are complex and may lead to synergistic and antagonistic responses, potentially influencing global biogeochemical cycles in warmer oceans.","PeriodicalId":163,"journal":{"name":"Environmental Microbiology Reports","volume":"17 4","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-2229.70158","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144657615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Functional Profiles of Phyllosphere and Rhizosphere Metagenomes Differ Across Milkweed Species 乳草种间根际和根际宏基因组功能特征的差异

IF 3.6 4区生物学

Environmental Microbiology Reports Pub Date : 2025-07-15 DOI: 10.1111/1758-2229.70150

Thorsten E. Hansen, Laramy S. Enders

{"title":"Functional Profiles of Phyllosphere and Rhizosphere Metagenomes Differ Across Milkweed Species","authors":"Thorsten E. Hansen, Laramy S. Enders","doi":"10.1111/1758-2229.70150","DOIUrl":"https://doi.org/10.1111/1758-2229.70150","url":null,"abstract":"Monarchs and their milkweed hosts are well studied for mechanisms of plant defence and insect counter-defence, but little is known about their associated microbiomes in this iconic system. It is unclear how herbivore-induced changes in milkweed microbiomes are linked to chemical defensive responses (i.e., plant secondary metabolites). Metagenomics was used to characterise functional gene profiles of bacterial communities associated with plant tissues and monarch caterpillars feeding in milkweed spp. (Asclepias curassavica L., 1753, Asclepias syriaca L., 1762, and Asclepias tuberosa subsp. tuberosa). We compared the influence of monarch feeding and milkweed spp. on phyllosphere and rhizosphere communities. Shotgun metagenomic sequencing was used to profile microbial diversity, predict annotative functions, assess microbial plant secondary metabolite (PSM) degradation potential, and look for enrichment of PSM degradation pathways. Findings show phyllosphere and rhizosphere microbiomes have distinct functional gene profiles and the presence of potential PSM metabolism genes that varied across milkweed spp. Rhizosphere metagenomes had more genes and metabolic pathways involved in degradation/detoxification of known classes of PSMs. In relation to milkweed defensive chemical profiles, we saw an inverse pattern of PSM metabolism pathways and enzymes. Overall, results suggested greater potential for PSM metabolism in rhizosphere compared to phyllosphere communities.","PeriodicalId":163,"journal":{"name":"Environmental Microbiology Reports","volume":"17 4","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-2229.70150","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Functional Profiles of Phyllosphere and Rhizosphere Metagenomes Differ Across Milkweed Species 乳草种间根际和根际宏基因组功能特征的差异

IF 3.6 4区生物学

Environmental Microbiology Reports Pub Date : 2025-07-15 DOI: 10.1111/1758-2229.70150

Thorsten E. Hansen, Laramy S. Enders

{"title":"Functional Profiles of Phyllosphere and Rhizosphere Metagenomes Differ Across Milkweed Species","authors":"Thorsten E. Hansen, Laramy S. Enders","doi":"10.1111/1758-2229.70150","DOIUrl":"https://doi.org/10.1111/1758-2229.70150","url":null,"abstract":"Monarchs and their milkweed hosts are well studied for mechanisms of plant defence and insect counter-defence, but little is known about their associated microbiomes in this iconic system. It is unclear how herbivore-induced changes in milkweed microbiomes are linked to chemical defensive responses (i.e., plant secondary metabolites). Metagenomics was used to characterise functional gene profiles of bacterial communities associated with plant tissues and monarch caterpillars feeding in milkweed spp. (Asclepias curassavica L., 1753, Asclepias syriaca L., 1762, and Asclepias tuberosa subsp. tuberosa). We compared the influence of monarch feeding and milkweed spp. on phyllosphere and rhizosphere communities. Shotgun metagenomic sequencing was used to profile microbial diversity, predict annotative functions, assess microbial plant secondary metabolite (PSM) degradation potential, and look for enrichment of PSM degradation pathways. Findings show phyllosphere and rhizosphere microbiomes have distinct functional gene profiles and the presence of potential PSM metabolism genes that varied across milkweed spp. Rhizosphere metagenomes had more genes and metabolic pathways involved in degradation/detoxification of known classes of PSMs. In relation to milkweed defensive chemical profiles, we saw an inverse pattern of PSM metabolism pathways and enzymes. Overall, results suggested greater potential for PSM metabolism in rhizosphere compared to phyllosphere communities.","PeriodicalId":163,"journal":{"name":"Environmental Microbiology Reports","volume":"17 4","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-2229.70150","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144635078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phenolic Iron Complexes Protect Glacier Ice Algae (Zygnematophyceae) Against Excessive UV and VIS Irradiation 酚类铁配合物保护冰川冰藻（Zygnematophyceae）免受过度的紫外线和可见光照射

IF 3.6 4区生物学

Environmental Microbiology Reports Pub Date : 2025-07-14 DOI: 10.1111/1758-2229.70149

Lenka Procházková, Peter Mojzeš, Jan Ráček, Linda Nedbalová, Daniel Remias

{"title":"Phenolic Iron Complexes Protect Glacier Ice Algae (Zygnematophyceae) Against Excessive UV and VIS Irradiation","authors":"Lenka Procházková, Peter Mojzeš, Jan Ráček, Linda Nedbalová, Daniel Remias","doi":"10.1111/1758-2229.70149","DOIUrl":"https://doi.org/10.1111/1758-2229.70149","url":null,"abstract":"Melting glacier surfaces are increasingly affected by blooms of psychrophilic microalgae, which darken the ice and lower its albedo, accelerating melting. These microalgae contain distinct vacuoles filled with brownish pigments that were earlier described as the unusual plant phenol purpurogallin. Recently, we discovered so far unreported, large amounts of iron dissolved in aqueous extracts of the glacier ice algae Ancylonema alaskanum. Since the vacuole content was very dark but the chromatographically isolated, aforementioned phenol was only yellowish, a putative complexation of iron with purpurogallin was assumed to be the reason. Application of several protocols, including Raman microscopy on both living cells and extracts, provided strong evidence that this microalga sequesters iron and forms organic metal complexes. Consequently, substantial amounts of so far uncharacterised Fe-complexes of purpurogallin are inferred to be present in Ancylonema, and that putative polymerisation of this compound impeded an earlier analytical discovery. This finding holds significant ecological implications for cold regions. The pigmentation not only enhances the tolerance of glacier ice algae to excessive UV and visible radiation but also influences our current understanding of the biochemical iron cycle in cryosphere-dominated polar and alpine regions. Further downstream consequences of this biological iron source remain to be elucidated.","PeriodicalId":163,"journal":{"name":"Environmental Microbiology Reports","volume":"17 4","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-2229.70149","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144615304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identifying the Effects of Fish and Rhizosphere on the Structure of the Planktonic Bacterial Communities and Resistome in an Aquaponics Recirculation Loop 确定鱼和根际对鱼共生循环中浮游细菌群落和抗性组结构的影响

IF 3.6 4区生物学

Environmental Microbiology Reports Pub Date : 2025-07-14 DOI: 10.1111/1758-2229.70128

Frédérique Changey, Christophe Merlin, Camille Fourrier, Pascal Fontaine, Laurence Mathieu

{"title":"Identifying the Effects of Fish and Rhizosphere on the Structure of the Planktonic Bacterial Communities and Resistome in an Aquaponics Recirculation Loop","authors":"Frédérique Changey, Christophe Merlin, Camille Fourrier, Pascal Fontaine, Laurence Mathieu","doi":"10.1111/1758-2229.70128","DOIUrl":"https://doi.org/10.1111/1758-2229.70128","url":null,"abstract":"Since they are saving resources, recirculating aquaculture systems (RAS) are perceived as a viable production strategy. Among them, aquaponics combines aquaculture and hydroponic vegetable production. This system entails a closed-loop water system and continuity between two main “generators of bacterial biodiversity” the plant and the fish, respectively associated with the rhizosphere and the gut microbiome. These ecosystems are powerful bioreactors capable of shaping microbial community structures by mimicking macroscale environmental interactions through selection, competition, and genetic invasion. This work aimed to clarify the respective roles of these bioreactors on planktonic bacteria and antibiotic-resistant bacteria (ARB) composition and segregation within a commercial aquaponic system composed of four aquaponics units differing by the fish reared. These units were assessed using a high-throughput qPCR (HT-qPCR) analysis of 384 antibiotic resistant genes (ARGs) and mobile genetic elements (MGEs) as well as 16S rRNA metabarcoding. The results highlight that the most important driver of bacterial communities and ARG distribution pattern in aquaponics environments appears to be the fish through their associated microbiota. Rhizosphere micro-environment seems to act as a mitigation factor on the relative abundance of detectable ARGs.","PeriodicalId":163,"journal":{"name":"Environmental Microbiology Reports","volume":"17 4","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-2229.70128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144615374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Freshwater Discharge and Salinity Drive Taxonomic and Functional Turnover of Microbial Communities in a Turbid Macrotidal Estuary 淡水流量和盐度驱动浑浊大潮河口微生物群落的分类和功能更替

IF 3.6 4区生物学

Environmental Microbiology Reports Pub Date : 2025-07-14 DOI: 10.1111/1758-2229.70135

Luz Amadei Martínez, Koen Sabbe, Sofie D'hondt, Renaat Dasseville, Ilse Daveloose, Tine Verstraete, Peter Chaerle, Natacha Brion, Tom Maris, Patrick Meire, Wim Vyverman

{"title":"Freshwater Discharge and Salinity Drive Taxonomic and Functional Turnover of Microbial Communities in a Turbid Macrotidal Estuary","authors":"Luz Amadei Martínez, Koen Sabbe, Sofie D'hondt, Renaat Dasseville, Ilse Daveloose, Tine Verstraete, Peter Chaerle, Natacha Brion, Tom Maris, Patrick Meire, Wim Vyverman","doi":"10.1111/1758-2229.70135","DOIUrl":"https://doi.org/10.1111/1758-2229.70135","url":null,"abstract":"The drivers of spatiotemporal changes in microorganism's functional community structure remain poorly understood. Using DNA-amplicon sequencing we studied the spatiotemporal dynamics of bacterial and eukaryotic microbial communities in the freshwater and brackish tidal reaches of the Schelde estuary (Belgium) from 2018 to 2021. Our analyses revealed pronounced seasonal and longitudinal turnover in autotrophic and heterotrophic microbiota, mainly driven by changes in freshwater discharge, which modulate the salinity and turbidity gradient. Higher discharge in early spring led to a more uniform community composition across the estuary, with higher relative abundances of heterotrophic eukaryotes. As discharge decreased in late spring, the salinity gradient and associated turnover in community composition became more accentuated, with Actinomycetota and diatoms dominating the upstream reaches, and ciliates, fungi and marine bacteria being relatively more important downstream from the maximum turbidity zone (MTZ). This study revealed fine-scale turnover in (semi)cryptic phytoplankton taxa and spatiotemporal changes in parasitism linked to bloom termination. High discharge due to exceptionally heavy rainfall resulted in the disruption of the phytoplankton bloom, more downstream spreading of freshwater species and a decline in brackish and polyhaline species. These results emphasise the intricate link between hydrodynamics and microbial community dynamics and ecological functions in estuarine ecosystems.","PeriodicalId":163,"journal":{"name":"Environmental Microbiology Reports","volume":"17 4","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-2229.70135","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144615375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

When Two Species Meet: A Potential Beetle-Yeast Facultative Mutualism 当两个物种相遇：一种潜在的甲虫-酵母兼性共生

IF 3.6 4区生物学

Environmental Microbiology Reports Pub Date : 2025-07-14 DOI: 10.1111/1758-2229.70157

Rodolfo Bizarria Jr., Tatiane de Castro Pietrobon, Pepijn W. Kooij, Andre Rodrigues

{"title":"When Two Species Meet: A Potential Beetle-Yeast Facultative Mutualism","authors":"Rodolfo Bizarria Jr., Tatiane de Castro Pietrobon, Pepijn W. Kooij, Andre Rodrigues","doi":"10.1111/1758-2229.70157","DOIUrl":"https://doi.org/10.1111/1758-2229.70157","url":null,"abstract":"Facultative mutualisms, such as some insect-yeast interactions, can be established between partners that only interact in certain stages of their life cycles. While exploring yeasts associated with Brazilian beetles, we found a particular Cyberlindnera yeast associated with Spermophthorus apuleiae. This yeast was found within the beetles' galleries, which are excavated in fruits of Libidibia ferrea, a native Brazilian tree. We isolated a total of 15 yeast and yeast-like species associated with the fruits and beetles, mostly from the orders Phaffomycetales and Serinales, and explored their role in yeast-beetle interactions. Cyberlindnera is the most recurrent yeast, found in 90% of the fruit samples infested with beetles and representing 79% of the total isolates. Results from bioassays support the interaction between Cyberlindnera and Spermophthorus apuleiae. We hypothesise that reciprocal benefits may underlie this association: beetle gallery excavation boosts the density of Cyberlindnera in fruits, while the yeast produces attractive volatiles to beetles. These volatiles are usually associated with signalling towards sugar resources that enhance dispersal, an idea that warrants further exploration. We consider the Cyberlindnera-beetle association a potential model for studying the ecology and evolution of non-obligate (facultative) mutualisms.","PeriodicalId":163,"journal":{"name":"Environmental Microbiology Reports","volume":"17 4","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-2229.70157","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144624705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonal Transition in the Dominance of Photoautotrophic and Heterotrophic Protists in the Photic Layer of a Subtropical Marine Ecosystem 亚热带海洋生态系统光层中光自养和异养原生生物优势的季节变化

IF 3.6 4区生物学

Environmental Microbiology Reports Pub Date : 2025-07-14 DOI: 10.1111/1758-2229.70126

Yoav Avrahami, Raffaele Siano, Maxim Rubin-Blum, Gil Koplovitz, Nicolas Henry, Colomban de Vargas, Miguel J. Frada

{"title":"Seasonal Transition in the Dominance of Photoautotrophic and Heterotrophic Protists in the Photic Layer of a Subtropical Marine Ecosystem","authors":"Yoav Avrahami, Raffaele Siano, Maxim Rubin-Blum, Gil Koplovitz, Nicolas Henry, Colomban de Vargas, Miguel J. Frada","doi":"10.1111/1758-2229.70126","DOIUrl":"https://doi.org/10.1111/1758-2229.70126","url":null,"abstract":"Protists are major functional players in the oceans. Time-resolved protist diversity and succession patterns remain poorly described in subtropical ecosystems, limiting current understanding of food web dynamics and responses to environmental changes in these major world-ocean regions. We used amplicon sequencing data and trait-based annotation to examine the seasonality of planktonic protists in the subtropical Gulf of Aqaba (Red Sea). Temperature and nutrients were the major drivers of succession. We detected marked seasonal shifts in protists. Heterotrophs, including diverse parasitic functional groups, dominated the warm, stratified oligotrophic period spanning spring and summer. By contrast, nutrient influx during deep convective mixing in winter triggered a shift to photoautotrophic communities dominated by a few genera of chlorophytes. Deeper winter mixing resulted in larger blooms at the onset of stratification dominated by diatoms, relative to chlorophytes that prevailed during shallower blooms. This result illustrates the impact of mixing depth on bloom formation and composition. Comparisons with oceanwide rDNA datasets indicate that the oligotrophic protist assemblages from the Gulf resemble those from warm, open oceans. This work provides a detailed assessment of the seasonal switch in dominant trophic functions in protists in phase with nutrient levels in a subtropical planktonic ecosystem.","PeriodicalId":163,"journal":{"name":"Environmental Microbiology Reports","volume":"17 4","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-2229.70126","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identifying the Effects of Fish and Rhizosphere on the Structure of the Planktonic Bacterial Communities and Resistome in an Aquaponics Recirculation Loop 确定鱼和根际对鱼共生循环中浮游细菌群落和抗性组结构的影响

IF 3.6 4区生物学

Environmental Microbiology Reports Pub Date : 2025-07-14 DOI: 10.1111/1758-2229.70128

Frédérique Changey, Christophe Merlin, Camille Fourrier, Pascal Fontaine, Laurence Mathieu

{"title":"Identifying the Effects of Fish and Rhizosphere on the Structure of the Planktonic Bacterial Communities and Resistome in an Aquaponics Recirculation Loop","authors":"Frédérique Changey, Christophe Merlin, Camille Fourrier, Pascal Fontaine, Laurence Mathieu","doi":"10.1111/1758-2229.70128","DOIUrl":"https://doi.org/10.1111/1758-2229.70128","url":null,"abstract":"Since they are saving resources, recirculating aquaculture systems (RAS) are perceived as a viable production strategy. Among them, aquaponics combines aquaculture and hydroponic vegetable production. This system entails a closed-loop water system and continuity between two main “generators of bacterial biodiversity” the plant and the fish, respectively associated with the rhizosphere and the gut microbiome. These ecosystems are powerful bioreactors capable of shaping microbial community structures by mimicking macroscale environmental interactions through selection, competition, and genetic invasion. This work aimed to clarify the respective roles of these bioreactors on planktonic bacteria and antibiotic-resistant bacteria (ARB) composition and segregation within a commercial aquaponic system composed of four aquaponics units differing by the fish reared. These units were assessed using a high-throughput qPCR (HT-qPCR) analysis of 384 antibiotic resistant genes (ARGs) and mobile genetic elements (MGEs) as well as 16S rRNA metabarcoding. The results highlight that the most important driver of bacterial communities and ARG distribution pattern in aquaponics environments appears to be the fish through their associated microbiota. Rhizosphere micro-environment seems to act as a mitigation factor on the relative abundance of detectable ARGs.","PeriodicalId":163,"journal":{"name":"Environmental Microbiology Reports","volume":"17 4","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-2229.70128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144615370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phenolic Iron Complexes Protect Glacier Ice Algae (Zygnematophyceae) Against Excessive UV and VIS Irradiation 酚类铁配合物保护冰川冰藻（Zygnematophyceae）免受过度的紫外线和可见光照射

IF 3.6 4区生物学

Environmental Microbiology Reports Pub Date : 2025-07-14 DOI: 10.1111/1758-2229.70149

Lenka Procházková, Peter Mojzeš, Jan Ráček, Linda Nedbalová, Daniel Remias

{"title":"Phenolic Iron Complexes Protect Glacier Ice Algae (Zygnematophyceae) Against Excessive UV and VIS Irradiation","authors":"Lenka Procházková, Peter Mojzeš, Jan Ráček, Linda Nedbalová, Daniel Remias","doi":"10.1111/1758-2229.70149","DOIUrl":"https://doi.org/10.1111/1758-2229.70149","url":null,"abstract":"Melting glacier surfaces are increasingly affected by blooms of psychrophilic microalgae, which darken the ice and lower its albedo, accelerating melting. These microalgae contain distinct vacuoles filled with brownish pigments that were earlier described as the unusual plant phenol purpurogallin. Recently, we discovered so far unreported, large amounts of iron dissolved in aqueous extracts of the glacier ice algae Ancylonema alaskanum. Since the vacuole content was very dark but the chromatographically isolated, aforementioned phenol was only yellowish, a putative complexation of iron with purpurogallin was assumed to be the reason. Application of several protocols, including Raman microscopy on both living cells and extracts, provided strong evidence that this microalga sequesters iron and forms organic metal complexes. Consequently, substantial amounts of so far uncharacterised Fe-complexes of purpurogallin are inferred to be present in Ancylonema, and that putative polymerisation of this compound impeded an earlier analytical discovery. This finding holds significant ecological implications for cold regions. The pigmentation not only enhances the tolerance of glacier ice algae to excessive UV and visible radiation but also influences our current understanding of the biochemical iron cycle in cryosphere-dominated polar and alpine regions. Further downstream consequences of this biological iron source remain to be elucidated.","PeriodicalId":163,"journal":{"name":"Environmental Microbiology Reports","volume":"17 4","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/1758-2229.70149","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144615372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0