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Timanikova N, Fletcher K, Han JW, van West P, Woodward S, Kim GH, Küpper FC, Wenzel M. Macroalgal eukaryotic microbiome composition indicates novel phylogenetic diversity and broad host spectrum of oomycete pathogens. Environ Microbiol 2024; 26:e16656. [PMID: 38818657 DOI: 10.1111/1462-2920.16656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 05/07/2024] [Indexed: 06/01/2024]
Abstract
Seaweeds are important components of marine ecosystems with emerging potential in aquaculture and as sources of biofuel, food products and pharmacological compounds. However, an increasingly recognised threat to natural and industrial seaweed populations is infection with parasitic single-celled eukaryotes from the relatively understudied oomycete lineage. Here we examine the eukaryomes of diverse brown, red and green marine macroalgae collected from polar (Baffin Island), cold-temperate (Falkland Islands) and tropical (Ascension Island) locations, with a focus on oomycete and closely related diatom taxa. Using 18S rRNA gene amplicon sequencing, we show unexpected genetic and taxonomic diversity of the eukaryomes, a strong broad-brush association between eukaryome composition and geographic location, and some evidence of association between eukaryome structure and macroalgal phylogenetic relationships (phylosymbiosis). However, the oomycete fraction of the eukaryome showed disparate patterns of diversity and structure, highlighting much weaker association with geography and no evidence of phylosymbiosis. We present several novel haplotypes of the most common oomycete Eurychasma dicksonii and report for the first time a cosmopolitan distribution and absence of host specificity of this important pathogen. This indicates rich diversity in macroalgal oomycete pathogens and highlights that these pathogens may be generalist and highly adaptable to diverse environmental conditions.
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Affiliation(s)
| | - Kyle Fletcher
- School of Biological Sciences, University of Aberdeen, Aberdeen, UK
- Oceanlab, University of Aberdeen, Newburgh, UK
- Aberdeen Oomycete Laboratory, International Centre for Aquaculture Research and Development, Institute of Medical Sciences, University of Aberdeen, Aberdeen, UK
| | - Jon-Wong Han
- Kongju National University, Gongju, South Chungcheong Province, South Korea
| | - Pieter van West
- Aberdeen Oomycete Laboratory, International Centre for Aquaculture Research and Development, Institute of Medical Sciences, University of Aberdeen, Aberdeen, UK
| | - Steve Woodward
- School of Biological Sciences, University of Aberdeen, Aberdeen, UK
| | - Gwang-Hoon Kim
- Kongju National University, Gongju, South Chungcheong Province, South Korea
| | - Frithjof C Küpper
- School of Biological Sciences, University of Aberdeen, Aberdeen, UK
- Kongju National University, Gongju, South Chungcheong Province, South Korea
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Aberdeen, UK
- Department of Chemistry and Biochemistry, San Diego State University, California, San Diego, California, USA
| | - Marius Wenzel
- School of Biological Sciences, University of Aberdeen, Aberdeen, UK
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Buaya A, Thines M. Miracula polaris - A New Species of Miracula from the East Fjords of Iceland. MYCOBIOLOGY 2024; 52:117-123. [PMID: 38690034 PMCID: PMC11057556 DOI: 10.1080/12298093.2024.2333611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 03/18/2024] [Indexed: 05/02/2024]
Abstract
There is increasing evidence that holocarpic oomycetes, i.e., those converting their entire vegetative thallus into zoospores upon maturation, are a phylogenetically diverse group in both freshwater and marine ecosystems. Most of the known holocarpic oomycete species diverge before the main split of Peronosporomycetes and Saprolegniomycetes and are, thus, termed as early-diverging oomycetes. In environmental sequencing studies, it was revealed that of the early-diverging genera especially Sirolpidium, Miracula, and Diatomophthora are widespread. As in these studies especially the Arctic Ocean seemed to harbor many undiscovered species, sampling was conducted at the Blávík research station on Fáskrúðsfjörður in the East Fjords of Iceland, where there is both an influence from the Arctic Ocean and the North Atlantic. During the screening for infected diatoms, a parasitoid was found in the marine diatom genus Melosira, which is one of the most abundant genera in arctic ecosystems. Molecular phylogenetics and morphological characterization revealed that the parasitoid belonged to the genus Miracula and corresponded to one of the lineages previously found in single-cell sequencing. Thus, the current study both contributes to the knowledge of the genus Miracula and the increasing diversity of the genus suggests that the many linages found in environmental sequencing which can still not be associated with known species might represent actual species to be discovered in future studies.
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Affiliation(s)
- Anthony Buaya
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt am Main, Germany
| | - Marco Thines
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt am Main, Germany
- Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Goethe University Frankfurt am Main, Frankfurt am Main, Germany
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Riit T, Cleary M, Adamson K, Blomquist M, Burokienė D, Marčiulynienė D, Oliva J, Poimala A, Redondo MA, Strømeng GM, Talgø V, Tedersoo L, Thomsen IM, Uimari A, Witzell J, Drenkhan R. Oomycete Soil Diversity Associated with Betula and Alnus in Forests and Urban Settings in the Nordic-Baltic Region. J Fungi (Basel) 2023; 9:926. [PMID: 37755034 PMCID: PMC10532727 DOI: 10.3390/jof9090926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/07/2023] [Accepted: 09/09/2023] [Indexed: 09/28/2023] Open
Abstract
This study aimed to determine the differences and drivers of oomycete diversity and community composition in alder- and birch-dominated park and natural forest soils of the Fennoscandian and Baltic countries of Estonia, Finland, Lithuania, Norway, and Sweden. For this, we sequenced libraries of PCR products generated from the DNA of 111 soil samples collected across a climate gradient using oomycete-specific primers on a PacBio high-throughput sequencing platform. We found that oomycete communities are most affected by temperature seasonality, annual mean temperature, and mean temperature of the warmest quarter. Differences in composition were partly explained by the higher diversity of Saprolegniales in Sweden and Norway, as both total oomycete and Saprolegniales richness decreased significantly at higher longitudes, potentially indicating the preference of this group of oomycetes for a more temperate maritime climate. None of the evaluated climatic variables significantly affected the richness of Pythiales or Peronosporales. Interestingly, the relative abundance and richness of Pythiales was higher at urban sites compared to forest sites, whereas the opposite was true for Saprolegniales. Additionally, this is the first report of Phytophthora gallica and P. plurivora in Estonia. Our results indicate that the composition of oomycetes in soils is strongly influenced by climatic factors, and, therefore, changes in climate conditions associated with global warming may have the potential to significantly alter the distribution range of these microbes, which comprise many important pathogens of plants.
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Affiliation(s)
- Taavi Riit
- Institute of Forestry and Engineering, Estonian University of Life Sciences, F. R. Kreutzwaldi 5, 51006 Tartu, Estonia; (T.R.)
| | - Michelle Cleary
- Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Sundsvägen 3, 230 53 Alnarp, Sweden
| | - Kalev Adamson
- Institute of Forestry and Engineering, Estonian University of Life Sciences, F. R. Kreutzwaldi 5, 51006 Tartu, Estonia; (T.R.)
| | - Mimmi Blomquist
- Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Sundsvägen 3, 230 53 Alnarp, Sweden
| | - Daiva Burokienė
- Nature Research Centre, Akademijos Str. 2, LT-08412 Vilnius, Lithuania
| | - Diana Marčiulynienė
- Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Sundsvägen 3, 230 53 Alnarp, Sweden
- Institute of Forestry, Lithuanian Research Centre for Agriculture and Forestry, Liepų Str. 1, LT-53101 Girionys, Lithuania
| | - Jonàs Oliva
- Department of Agricultural and Forest Sciences and Engineering, University of Lleida, 25198 Lleida, Spain
- Joint Research Unit CTFC–Agrotecnio, 25198 Lleida, Spain
| | - Anna Poimala
- Natural Resources Institute Finland (LUKE), Latokartanonkaari 9, 00790 Helsinki, Finland
| | - Miguel Angel Redondo
- Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, P.O. Box 7026, 750 07 Uppsala, Sweden
| | - Gunn Mari Strømeng
- Norwegian Institute of Bioeconomy Research, NIBIO, Høgskoleveien 7, 1433 Ås, Norway
| | - Venche Talgø
- Norwegian Institute of Bioeconomy Research, NIBIO, Høgskoleveien 7, 1433 Ås, Norway
| | - Leho Tedersoo
- Mycology and Microbiology Center, University of Tartu, J. Liivi 2, 50409 Tartu, Estonia
| | - Iben Margrete Thomsen
- Department of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, 1958 Frederiksberg C, Denmark
| | - Anne Uimari
- Natural Resources Institute Finland (LUKE), Juntintie 154, 77600 Suonenjoki, Finland
| | - Johanna Witzell
- Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Sundsvägen 3, 230 53 Alnarp, Sweden
- Department of Forestry and Wood Technology, Linnaeus University, 351 95 Växjö, Sweden
| | - Rein Drenkhan
- Institute of Forestry and Engineering, Estonian University of Life Sciences, F. R. Kreutzwaldi 5, 51006 Tartu, Estonia; (T.R.)
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Buaya A, Tsai I, Thines M. Pontisma blauvikense sp. nov. the first member of the early-diverging oomycete genus Pontisma parasitizing brown algae. J Eukaryot Microbiol 2023; 70:e12957. [PMID: 36447377 DOI: 10.1111/jeu.12957] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 10/25/2022] [Accepted: 11/10/2022] [Indexed: 12/04/2022]
Abstract
Holocarpic oomycetes have been neglected over several decades, until interest in these organisms has recently resurged. One of the most widespread genera of holocarpic oomycetes is Pontisma, parasitic to red seaweeds throughout all oceans. Recently, the genus Sirolpidium (parasitic to green algae) was found to be congeneric with Pontisma. This hinted at a high pathogenic versatility and prompted the screening of other macroalgae on the coastline of Iceland. During this survey a parasite of the brown algae Pylaiella littoralis was found, which formed anisolpidium-like thalli, but produced biflagellate zoospores. Phylogenetic investigations revealed that the parasite was placed in the genus Pontisma. In reconstructions based on partial nrSSU sequences, it grouped with some sequences of parasitoids of the diatom genus Licmophora, but the more variable mitochondrial cox2 sequences were divergent. Based on phylogenetic evidence and the unique parasitism of brown algae, the parasitoid is described as Pontisma blauvikense in this study. Pontisma blauvikense is the fourth oomycete species parasitic to Pylaiella, which is also parasitised by Euychasma dicksonii and two Anisolpidium species. For a better understanding of the ecology and evolution of holocarpic oomycetes, further research is necessary to investigate the host spectrum of Pontisma in general and Pontisma blauvikense in particular.
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Affiliation(s)
- Anthony Buaya
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt am Main, Germany
| | - Ichen Tsai
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt am Main, Germany
- Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Goethe University Frankfurt am Main, Frankfurt am Main, Germany
| | - Marco Thines
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Frankfurt am Main, Germany
- Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Goethe University Frankfurt am Main, Frankfurt am Main, Germany
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Buaya A, Thines M. Miracula blauvikensis: a new species of Miracula from Iceland, and report of a co-cultivation system for studying oomycete-diatom interactions. Fungal Syst Evol 2022; 10:169-175. [PMID: 36741555 PMCID: PMC9875693 DOI: 10.3114/fuse.2022.10.07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/28/2022] [Indexed: 12/12/2022] Open
Abstract
The genus Miracula represents an early-diverging lineage of diatom-parasitic Oomycota, straminipilous eukaryotes that have evolved fungal features independent from the opisthokont Fungi. Recent studies have revealed that diatom parasitoids are much more species-rich than previously thought and may play an important role in limnic and marine ecosystems. Of the different diatom-parasitic lineages, the genus Miracula is one of the most abundant in marine ecosystems. Here a species of Miracula parasitising Fragilaria capucina s.l. from Iceland is described as Miracula blauvikensis. In addition, its phylogenetic position is clarified and its life-cycle documented. The species has been brought into co-cultivation with its host, and due to the ease of cultivation and the convenient microscopy of the diatom threads, this co-culture might be a useful tool to study oomycete-diatom interactions in the future. Citation: Buaya A, Thines M (2022). Miracula blauvikensis: a new species of Miracula from Iceland, and report of a co-cultivation system for studying oomycete-diatom interactions. Fungal Systematics and Evolution 10: 169-175. doi: 10.3114/fuse.2022.10.07.
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Affiliation(s)
- A. Buaya
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Senckenberganlage 25, 60325 Frankfurt am Main, Germany,*Corresponding authors: ,
| | - M. Thines
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Senckenberganlage 25, 60325 Frankfurt am Main, Germany,Goethe University Frankfurt am Main, Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue-Str. 13, 60438 Frankfurt am Main, Germany,*Corresponding authors: ,
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Lagena—an overlooked oomycete genus with a wide range of hosts. Mycol Prog 2022. [DOI: 10.1007/s11557-022-01818-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
AbstractLagena has so far only been known from the scarcely reported but widespread species Lagena radicicola, which is a parasite of root epidermal cells. While it was mostly reported from a wide range of cereals and other grasses, it has been shown to affect some dicot species under, e.g. tobacco and sugar beet. Due to the wide host spectrum under laboratory conditions, there were no attempts to subdivide the genus into several species, even though some morphological differentiation was reported and the species had been found in several continents. During a survey of diatoms, we came across some parasitoids that would have previously been assumed to be members of the genus Lagenidium. The species exhibited rather narrow host specificity in nature. One species was brought into dual culture with host diatoms of the genus Ulnaria, but could not be transferred to other host genera. Surprisingly, phylogenetic analyses revealed that Lagena radicicola was in a sister clade to that formed by the diatom parasitoids, suggesting a versatile pathogenicity of the genus. Interestingly, several phylogenetic lineages only known from environmental sequencing were clustered with the species found in this study, hinting an undiscovered diversity in the genus Lagena.
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Ilicic D, Woodhouse J, Karsten U, Zimmermann J, Wichard T, Quartino ML, Campana GL, Livenets A, Van den Wyngaert S, Grossart HP. Antarctic Glacial Meltwater Impacts the Diversity of Fungal Parasites Associated With Benthic Diatoms in Shallow Coastal Zones. Front Microbiol 2022; 13:805694. [PMID: 35308360 PMCID: PMC8931407 DOI: 10.3389/fmicb.2022.805694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Accepted: 01/12/2022] [Indexed: 01/04/2023] Open
Abstract
Aquatic ecosystems are frequently overlooked as fungal habitats, although there is increasing evidence that their diversity and ecological importance are greater than previously considered. Aquatic fungi are critical and abundant components of nutrient cycling and food web dynamics, e.g., exerting top-down control on phytoplankton communities and forming symbioses with many marine microorganisms. However, their relevance for microphytobenthic communities is almost unexplored. In the light of global warming, polar regions face extreme changes in abiotic factors with a severe impact on biodiversity and ecosystem functioning. Therefore, this study aimed to describe, for the first time, fungal diversity in Antarctic benthic habitats along the salinity gradient and to determine the co-occurrence of fungal parasites with their algal hosts, which were dominated by benthic diatoms. Our results reveal that Ascomycota and Chytridiomycota are the most abundant fungal taxa in these habitats. We show that also in Antarctic waters, salinity has a major impact on shaping not just fungal but rather the whole eukaryotic community composition, with a diversity of aquatic fungi increasing as salinity decreases. Moreover, we determined correlations between putative fungal parasites and potential benthic diatom hosts, highlighting the need for further systematic analysis of fungal diversity along with studies on taxonomy and ecological roles of Chytridiomycota.
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Affiliation(s)
- Doris Ilicic
- Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Neuglobsow, Germany
| | - Jason Woodhouse
- Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Neuglobsow, Germany
| | - Ulf Karsten
- Institute of Biological Sciences, Applied Ecology and Phycology, University of Rostock, Rostock, Germany
| | - Jonas Zimmermann
- Botanic Garden and Botanical Museum Berlin-Dahlem, Freie Universität Berlin, Berlin, Germany
| | - Thomas Wichard
- Institute for Inorganic and Analytical Chemistry, Friedrich-Schiller-University Jena, Jena, Germany
| | | | - Gabriela Laura Campana
- Department of Coastal Biology, Argentinean Antarctic Institute, Buenos Aires, Argentina
- Department of Basic Sciences, National University of Luján, Luján, Buenos Aires, Argentina
| | - Alexandra Livenets
- Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Neuglobsow, Germany
| | | | - Hans-Peter Grossart
- Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Neuglobsow, Germany
- Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany
- *Correspondence: Hans-Peter Grossart,
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Ilicic D, Grossart HP. Basal Parasitic Fungi in Marine Food Webs-A Mystery Yet to Unravel. J Fungi (Basel) 2022; 8:114. [PMID: 35205868 PMCID: PMC8874645 DOI: 10.3390/jof8020114] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 01/20/2022] [Accepted: 01/25/2022] [Indexed: 02/01/2023] Open
Abstract
Although aquatic and parasitic fungi have been well known for more than 100 years, they have only recently received increased awareness due to their key roles in microbial food webs and biogeochemical cycles. There is growing evidence indicating that fungi inhabit a wide range of marine habitats, from the deep sea all the way to surface waters, and recent advances in molecular tools, in particular metagenome approaches, reveal that their diversity is much greater and their ecological roles more important than previously considered. Parasitism constitutes one of the most widespread ecological interactions in nature, occurring in almost all environments. Despite that, the diversity of fungal parasites, their ecological functions, and, in particular their interactions with other microorganisms remain largely speculative, unexplored and are often missing from current theoretical concepts in marine ecology and biogeochemistry. In this review, we summarize and discuss recent research avenues on parasitic fungi and their ecological potential in marine ecosystems, e.g., the fungal shunt, and emphasize the need for further research.
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Affiliation(s)
- Doris Ilicic
- Leibniz Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, 16775 Stechlin, Germany;
| | - Hans-Peter Grossart
- Leibniz Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, 16775 Stechlin, Germany;
- Institute of Biochemistry and Biology, Potsdam University, Maulbeerallee 2, 14469 Potsdam, Germany
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Kaczmarek A, Boguś MI. Fungi of entomopathogenic potential in Chytridiomycota and Blastocladiomycota, and in fungal allies of the Oomycota and Microsporidia. IMA Fungus 2021; 12:29. [PMID: 34635188 PMCID: PMC8504053 DOI: 10.1186/s43008-021-00074-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 07/25/2021] [Indexed: 11/10/2022] Open
Abstract
The relationship between entomopathogenic fungi and their insect hosts is a classic example of the co-evolutionary arms race between pathogen and target host. The present review describes the entomopathogenic potential of Chytridiomycota and Blastocladiomycota fungi, and two groups of fungal allies: Oomycota and Microsporidia. The Oomycota (water moulds) are considered as a model biological control agent of mosquito larvae. Due to their shared ecological and morphological similarities, they had long been considered a part of the fungal kingdom; however, phylogenetic studies have since placed this group within the Straminipila. The Microsporidia are parasites of economically-important insects, including grasshoppers, lady beetles, bumblebees, colorado potato beetles and honeybees. They have been found to display some fungal characteristics, and phylogenetic studies suggest that they are related to fungi, either as a basal branch or sister group. The Blastocladiomycota and Chytridiomycota, named the lower fungi, historically were described together; however, molecular phylogenetic and ultrastructural research has classified them in their own phylum. They are considered parasites of ants, and of the larval stages of black flies, mosquitoes and scale insects.
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Affiliation(s)
- Agata Kaczmarek
- Witold Stefański Institute of Parasitology, Polish Academy of Sciences, Twarda 51/55, 00-818, Warsaw, Poland.
| | - Mieczysława I Boguś
- Witold Stefański Institute of Parasitology, Polish Academy of Sciences, Twarda 51/55, 00-818, Warsaw, Poland
- Biomibo, Strzygłowska 15, 04-872, Warsaw, Poland
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Buaya AT, Scholz B, Thines M. A New Marine Species of Miracula ( Oomycota) Parasitic to Minidiscus sp. in Iceland †. MYCOBIOLOGY 2021; 49:355-362. [PMID: 34512079 PMCID: PMC8409938 DOI: 10.1080/12298093.2021.1952813] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 06/29/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
Obligate endoparasitic oomycetes are known to ubiquitously occur in marine and freshwater diatoms, but their diversity is still largely unexplored. Many of these parasitoids are members of the early-diverging oomycete lineages (Miracula, Diatomophthora), others are within the Leptomitales of the Saprolegniomycetes (Ectrogella, Lagenisma) and some have been described in the Peronosporomycetes (Aphanomycopsis, Lagenidium). Even though some species have been recently described and two new genera were introduced (Miracula and Diatomophthora), the phylogeny and taxonomy of most of these organisms remain unresolved. This is contrasted by the high number of sequences from unclassified species, as recently revealed from environmental sequencing, suggesting the presence of several undiscovered species. In this study, a new species of Miracula is reported from a marine centric diatom (Minidiscus sp.) isolated from Skagaströnd harbor in Northwest Iceland. The morphology and life cycle traits of this novel oomycete parasite are described herein, and its taxonomic placement within the genus Miracula is confirmed by molecular phylogeny. As it cannot be assigned to any previously described species, it is introduced as Miracula islandica in this study. The genus Miracula thus contains three described holocarpic species (M. helgolandica, M. islandica, M. moenusica) to which likely additional species will need to be added in the future, considering the presence of several lineages known only from environmental sequencing that clustered within the Miracula clade.
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Affiliation(s)
- Anthony T. Buaya
- Senckenberg Biodiversity and Climate Research Center, Frankfurt am Main, Germany
| | | | - Marco Thines
- Senckenberg Biodiversity and Climate Research Center, Frankfurt am Main, Germany
- Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Goethe-Universität Frankfurt am Main, Frankfurt am Main, Germany
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Mirzaee MR, Ploch S, Thines M. A new desert-dwelling oomycete, Pustula persica sp. nov., on Gymnarrhena micrantha ( Asteraceae) from Iran. MYCOSCIENCE 2021; 62:239-243. [PMID: 37092169 PMCID: PMC9721518 DOI: 10.47371/mycosci.2021.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 03/16/2021] [Accepted: 03/16/2021] [Indexed: 11/16/2022]
Abstract
The obligate biotrophic oomycete genus Pustula is one of the four major linages of white blister rusts (Albuginaceae) identified so far. Species of the genus Pustula cause white blister rust on numerous genera in the asterids, represented by several phylogenetically distinct genus-specific lineages, most of which still await formal description. Thus, the observation of the species of Pustula on the Asteraceae subfamily Gymnorhenoideae pointed out to the existence of a hitherto undescribed species. By the morphological and molecular phylogenetic investigation conducted in this study it is concluded that the pathogen on Gymnarrhena micrantha from Iran indeed represents a hitherto unknown species and is described as P. persica. This species has apparently adapted to desert condition and is, after Albugo arenosa, the second species of white blister rust from Iranian deserts, highlighting the adaptability of white blister rusts to hot and dry habitats.
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Affiliation(s)
- Mohammad Reza Mirzaee
- Plant Protection Research Department, South Khorasan Agricultural and Natural Resources Research and Education Center, AREEO
| | | | - Marco Thines
- Senckenberg Biodiversity and Climate Research Centre
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Langer JAF, Sharma R, Nam B, Hanic L, Boersma M, Schwenk K, Thines M. Cox2 community barcoding at Prince Edward Island reveals long-distance dispersal of a downy mildew species and potentially marine members of the Saprolegniaceae. Mycol Prog 2021. [DOI: 10.1007/s11557-021-01687-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AbstractMarine oomycetes are highly diverse, globally distributed, and play key roles in marine food webs as decomposers, food source, and parasites. Despite their potential importance in global ocean ecosystems, marine oomycetes are comparatively little studied. Here, we tested if the primer pair cox2F_Hud and cox2-RC4, which is already well-established for phylogenetic investigations of terrestrial oomycetes, can also be used for high-throughput community barcoding. Community barcoding of a plankton sample from Brudenell River (Prince Edward Island, Canada), revealed six distinct oomycete OTU clusters. Two of these clusters corresponded to members of the Peronosporaceae—one could be assigned to Peronospora verna, an obligate biotrophic pathogen of the terrestrial plant Veronica serpyllifolia and related species, the other was closely related to Globisporangium rostratum. While the detection of the former in the sample is likely due to long-distance dispersal from the island, the latter might be a bona fide marine species, as several cultivable species of the Peronosporaceae are known to withstand high salt concentrations. Two OTU lineages could be assigned to the Saprolegniaceae. While these might represent marine species of the otherwise terrestrial genus, it is also conceivable that they were introduced on detritus from the island. Two additional OTU clusters were grouped with the early-diverging oomycete lineages but could not be assigned to a specific family. This reflects the current underrepresentation of cox2 sequence data which will hopefully improve with the increasing interest in marine oomycetes.
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Buaya AT, Scholz B, Thines M. Sirolpidium bryopsidis, a parasite of green algae, is probably conspecific with Pontisma lagenidioides, a parasite of red algae. Fungal Syst Evol 2021; 7:223-231. [PMID: 34124625 PMCID: PMC8165961 DOI: 10.3114/fuse.2021.07.11] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 02/22/2021] [Indexed: 11/10/2022] Open
Abstract
The genus Sirolpidium (Sirolpidiaceae) of the Oomycota includes several species of holocarpic obligate aquatic parasites. These organisms are widely occurring in marine and freshwater habitats, mostly infecting filamentous green algae. Presently, all species are only known from their morphology and descriptive life cycle traits. None of the seven species classified in Sirolpidium, including the type species, S. bryopsidis, has been rediscovered and studied for their molecular phylogeny, so far. Originally, the genus was established to accommodate all parasites of filamentous marine green algae. In the past few decades, however, Sirolpidium has undergone multiple taxonomic revisions and several species parasitic in other host groups were added to the genus. While the phylogeny of the marine rhodophyte- and phaeophyte-infecting genera Pontisma and Eurychasma, respectively, has only been resolved recently, the taxonomic placement of the chlorophyte-infecting genus Sirolpidium remained unresolved. In the present study, we report the phylogenetic placement of Sirolpidium bryopsidis infecting the filamentous marine green algae Capsosiphon fulvescens sampled from Skagaströnd in Northwest Iceland. Phylogenetic reconstructions revealed that S. bryopsidis is either conspecific or at least very closely related to the type species of Pontisma, Po. lagenidioides. Consequently, the type species of genus Sirolpidium, S. bryopsidis, is reclassified to Pontisma. Further infection trials are needed to determine if Po. bryopsidis and Po. lagenidioides are conspecific or closely related. In either case, the apparently recent host jump from red to green algae is remarkable, as it opens the possibility for radiation in a largely divergent eukaryotic lineage. Citation: Buaya AT, Scholz B, Thines M (2021). Sirolpidium bryopsidis, a parasite of green algae, is probably conspecific with Pontisma lagenidioides, a parasite of red algae. Fungal Systematics and Evolution7: 223–231. doi: 10.3114/fuse.2021.07.11
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Affiliation(s)
- A T Buaya
- Senckenberg Biodiversity and Climate Research Center, Senckenberganlage 25, D-60325 Frankfurt am Main, Germany
| | - B Scholz
- BioPol ehf, Marine Biotechnology, Einbúastig 2, 545 Skagaströnd, Iceland
| | - M Thines
- Senckenberg Biodiversity and Climate Research Center, Senckenberganlage 25, D-60325 Frankfurt am Main, Germany.,Goethe-University Frankfurt am Main, Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue Str. 13, D-60438 Frankfurt am Main, Germany.,LOEWE Centre for Translational Biodiversity Genomics, Georg-Voigt-Str. 14-16, D-60325 Frankfurt am Main, Germany
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Taxonomy and phylogeny of Aphanomycopsis bacillariacearum, a holocarpic oomycete parasitoid of the freshwater diatom genus Pinnularia. Mycol Prog 2021. [DOI: 10.1007/s11557-021-01668-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
AbstractInvestigations into simple holocarpic oomycetes are challenging, because of the obligate biotrophic nature of many lineages and the periodic presence in their hosts. Thus, despite recent efforts, still, the majority of species described remains to be investigated for their phylogenetic relationships. One of these species is Aphanomycopsis bacillariacearum, the type species of the genus Aphanomycopsis. Species of Aphanomycopsis are endobiotic holocarpic parasites of diverse hosts (e.g., diatoms, desmids, dinoflagellates). All species classified in this genus were assigned to it based on the presence of branching hyphae and the formation of two generations of zoospores, of which the first one is not motile. Originally, Aphanomycopsis with its type species, A. bacillariacearum, had been classified in the Saprolegniaceae. However, the genus has undergone multiple taxonomic reassignments (to Ectrogellaceae, Lagenidiaceae, and Leptolegniellaceae) in the past. To settle the taxonomy and investigate the phylogenetic placement of Aphanomycopsis, efforts were undertaken to isolate A. bacillariacearum from its original host, Pinnularia viridis and infer its phylogenetic placement based on nrSSU (18S) sequences. By targeted isolation, the diatom parasitoid was rediscovered from Heiðarvatn lake, Höskuldsstaðir, Iceland. Phylogenetic reconstruction shows that A. bacillariacearum from Pinnularia viridis is embedded within the Saprolegniales, and largely unrelated to both diatom-infecting oomycetes in the Leptomitales (Ectrogella, Lagenisma) and those placed within the early-diverging lineages (Miracula, Diatomophthora) of the Oomycota.
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Yang S, Xu W, Gao Y, Chen X, Luo ZH. Fungal diversity in deep-sea sediments from Magellan seamounts environment of the western Pacific revealed by high-throughput Illumina sequencing. J Microbiol 2020; 58:841-852. [PMID: 32876913 DOI: 10.1007/s12275-020-0198-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 07/14/2020] [Accepted: 07/21/2020] [Indexed: 12/12/2022]
Abstract
There are lots of seamounts globally whose primary production is disproportionally greater than the surrounding areas. Compared to other deep-sea environments, however, the seamounts environment is relatively less explored for fungal diversity. In the present study, we explored the fungal community structure in deep-sea sediments from four different stations of the Magellan seamounts environment by using high-throughput sequencing of the ITS1 region. A total of 1,897,618 ITS1 sequences were obtained. Among these sequences, fungal ITS1 sequences could be clustered into 1,662 OTUs. The majority of these sequences belonged to Ascomycota. In the genera level, the most abundant genus was Mortierella (4.79%), which was reported as a common fungal genus in soil and marine sediments, followed by Umbelopsis (3.80%), Cladosporium (2.98%), Saccharomycopsis (2.53%), Aspergillus (2.42%), Hortaea (2.36%), Saitozyma (2.20%), Trichoderma (2.12%), Penicillium (2.11%), Russula (1.86%), and Verticillium (1.40%). Most of these recovered genera belong to Ascomycota. The Bray-Curtis analysis showed that there was 37 to 85% dissimilarity of fungal communities between each two sediment samples. The Principal coordinates analysis clearly showed variations in the fungal community among different sediment samples. These results suggested that there was a difference in fungal community structures not only among four different sampling stations but also for different layers at the same station. The depth and geographical distance significantly affect the fungal community, and the effect of depth and geographical distance on the structure of the fungal community in the Magellan seamounts is basically same. Most of the fungi were more or less related to plants, these plant parasitic/symbiotic/endophytic fungi constitute a unique type of seamounts environmental fungal ecology, different from other marine ecosystems.
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Affiliation(s)
- Shuai Yang
- Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, 178 Daxue Road, Xiamen, 361005, P. R. China
| | - Wei Xu
- Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, 178 Daxue Road, Xiamen, 361005, P. R. China
| | - Yuanhao Gao
- Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, 178 Daxue Road, Xiamen, 361005, P. R. China
| | - Xiaoyao Chen
- Monotoring Center of Fishery Resources, Fujian Province, Fuzhou, 350003, P. R. China
| | - Zhu-Hua Luo
- Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, Ministry of Natural Resources, 178 Daxue Road, Xiamen, 361005, P. R. China. .,Co-Innovation Center of Jiangsu Marine Bioindustry Technology, Jiangsu Ocean University, Lianyungang, 222005, P. R. China. .,School of Marine Sciences, Nanjing University of Information Science & Technology, Nanjing, 210044, P. R. China.
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16
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Phylogeny and cultivation of the holocarpic oomycete Diatomophthora perforans comb. nov., an endoparasitoid of marine diatoms. Mycol Prog 2020. [DOI: 10.1007/s11557-020-01569-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
AbstractOomycetes infecting diatoms are biotrophic parasitoids and live in both marine and freshwater environments. They are ubiquitous, but the taxonomic affinity of many species remains unclear and the majority of them have not been studied for their molecular phylogeny. Only recently, the phylogenetic and taxonomic placement of some diatom-infecting, early-diverging oomycetes was resolved, including the genera Ectrogella, Miracula, Olpidiopsis, and Pontisma. A group of holocarpic diatom parasitoids with zoospores swarming within the sporangium before release were found to be unrelated to the known genera with diatom-infecting species, and were re-classified to a new genus, Diatomophthora. However, about a dozen species of holocarpic diatom parasitoids with unclear affinity remained unsequenced, which includes a commonly occurring species so far identified as Ectrogella perforans. However, this assignment to Ectrogella is doubtful, as the species was not reported to feature a clear-cut diplanetism, a hallmark of Ectrogella s. str. and the whole class Saprolegniomycetes. It was the aim of the current study to clarify the phylogenetic affinities of the species and if the rather broad host range reported is correct or a reflection of cryptic species. By targeted screening, the parasitoid was rediscovered from Helgoland Roads, North Sea and Oslo Fjord, Southern Norway and investigated for its phylogenetic placement using small ribosomal subunit (18S) sequences. Stages of its life cycle on different marine diatoms were described and its phylogenetic placement in the genus Diatomophthora revealed. A stable host-parasite axenic culture from single spore strains of the parasitoid were established on several strains of Pleurosigma intermedium and Coscinodiscus concinnus. These have been continuously cultivated along with their hosts for more than 2 years, and cultural characteristics are reported. Cross-infection trials revealed the transferability of the strains between hosts under laboratory conditions, despite some genetic distance between the pathogen strains. Thus, we hypothesise that D. perforans might be in the process of active radiation to new host species.
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Buaya AT, Thines M. Bolbea parasitica gen. et sp. nov., a cultivable holocarpic parasitoid of the early-diverging Saprolegniomycetes. Fungal Syst Evol 2020; 6:129-137. [PMID: 32904153 PMCID: PMC7451777 DOI: 10.3114/fuse.2020.06.07] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Holocarpic oomycetes convert their entire cytoplasm into zoospores and thus do not form dedicated sporangia or hyphal compartments for asexual reproduction. The majority of holocarpic oomycetes are obligate parasites and parasitoids of a diverse suite of organisms, among them green and red algae, brown seaweeds, diatoms, fungi, oomycetes and invertebrates. Most of them are found among the early diverging oomycetes or the Peronosporomycetes, and some in the early-diverging Saprolegniomycetes (Leptomitales). The obligate parasitism renders it difficult to study some of these organisms. Only a few members of the genus Haliphthoross. l. have been cultured without their hosts, and of the parasitoid Leptomitales, some transient cultures have been established, which are difficult to maintain. Here, the cultivation of a new holocarpic oomycete genus of the Leptomitales, Bolbea, is presented. Bolbea is parasitic to ostracods, is readily cultivable on malt extract agar, and upon contact with water converts its cytoplasm into zoospores. Its morphology and phylogenetic relationships are reported. Due to the ease of cultivation and the ready triggering of zoospore development, similar to some lagenidiaceous oomycetes, the species could be a promising model to study sporulation processes in detail.
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Affiliation(s)
- A T Buaya
- Goethe-Universität Frankfurt am Main, Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue-Str. 13, D-60438 Frankfurt am Main, Germany.,Senckenberg Biodiversity and Climate Research Centre, Senckenberg Gesellschaft für Naturforschung, Senckenberganlage 25, D-60325 Frankfurt am Main, Germany
| | - M Thines
- Goethe-Universität Frankfurt am Main, Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue-Str. 13, D-60438 Frankfurt am Main, Germany.,Senckenberg Biodiversity and Climate Research Centre, Senckenberg Gesellschaft für Naturforschung, Senckenberganlage 25, D-60325 Frankfurt am Main, Germany.,LOEWE Centre for Translational Biodiversity Genomics, Georg-Voigt-Str. 14-16, D-60325 Frankfurt am Main, Germany
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Su CJ, Hsieh SY, Chiang MWL, Pang KL. Salinity, pH and temperature growth ranges of Halophytophthora isolates suggest their physiological adaptations to mangrove environments. Mycology 2020; 11:256-262. [PMID: 33062386 PMCID: PMC7534344 DOI: 10.1080/21501203.2020.1714768] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Species of Halophytophthora are early colonisers of fallen mangrove leaves in the tropics but recently found commonly in temperate areas. In mangrove habitats, temperature and salinity change rapidly daily (high/low tide) and seasonally (summer/winter, rainy/dry seasons). Mangrove organisms have to develop adaptive strategies to thrive in such a physiologically challenging environment. In this study, growth of three isolates of Halophytophthora avicenniae and two isolates of H. batemanensis was tested under combined effects of 3 temperatures (15°C, 25°C, 37°C), 3 pHs (6, 7, 8) and 4 salinities (4 ‰, 8 ‰, 16 ‰, 32 ‰). No/little growth was observed at 37°C and growth saturation occurred earlier at 25°C than at 15°C. The log phase of growth was steeper at pH 6 than pH 7 and 8. Temperature and pH were found to exert a greater effect on growth than salinity. Generally, a reduction of growth rate was observed at pH 8 and 15°C. Increase in salinity caused a slight decrease in growth, most noticeable at 32 ‰. The wide growth ranges of temperature, salinity and pH of Halophytophthora isolates suggest that they are well adapted to the physical and chemical conditions of mangrove habitats.
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Affiliation(s)
- Chun-Jui Su
- Institute of Marine Biology and Centre of Excellence for the Oceans, National Taiwan Ocean University, Keelung, Taiwan
| | - Sung-Yuan Hsieh
- Bioresource Collection and Research Center, Food Industry Research and Development Institute, Hsinchu, Taiwan
| | | | - Ka-Lai Pang
- Institute of Marine Biology and Centre of Excellence for the Oceans, National Taiwan Ocean University, Keelung, Taiwan
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