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Usman AS, Merican F, Zaki S, Broady P, Convey P, Muangmai N. Microcystin production by oscillatorialean cyanobacteria isolated from cryopreserved Antarctic mats. HARMFUL ALGAE 2022; 120:102336. [PMID: 36470600 DOI: 10.1016/j.hal.2022.102336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 09/30/2022] [Accepted: 10/27/2022] [Indexed: 06/17/2023]
Abstract
Twenty cyanobacterial strains of eight morphospecies isolated from deep-frozen (-15 °C) mat samples originally collected on Ross Island, in Victoria Land, and on the McMurdo Ice Shelf were screened for the presence of genes encoding for production of anatoxins, cylindrospermopsin, microcystin/nodularin and saxitoxin. One strain of each of Microcoleus autumnalis and Phormidesmis priestleyi and two strains of Wilmottia murrayi were found to produce microcystin. No toxin production was detected in the other 16 strains representing five species. The four toxin-producing strains were characterised using both morphological and molecular approaches. Phylogenetic analyses using partial 16S rRNA sequences were consistent with the morphological identification of all four strains. They were all found to contain a fragment of the mcyE gene, which is involved in microcystin biosynthesis. ELISA analysis of extracts from cultures of these strains confirmed the presence of low concentrations of microcystin: 0.35 μg/L in M. autumnalis, <0.15 μg/L in P. priestleyi, 1.60 μg/L in W. murrayi strain 1 and 0.9 μg/L in W. murrayi strain 2. This study includes the first report of microcystin synthesis by W. murrayi.
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Affiliation(s)
- Aminu Surajo Usman
- School of Biological Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia
| | - Faradina Merican
- School of Biological Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia.
| | - Syazana Zaki
- School of Biological Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia
| | - Paul Broady
- School of Biological Sciences, University of Canterbury, New Zealand
| | - Peter Convey
- British Antarctic Survey, Cambridge, UK; Department of Zoology, University of Johannesburg, Auckland Park, South Africa
| | - Narongrit Muangmai
- Department of Fishery Biology, Faculty of Fisheries, Kasetsart University, Chatuchak, Bangkok, Thailand
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Radzi R, Muangmai N, Broady P, Wan Omar WM, Lavoue S, Convey P, Merican F. Nodosilinea signiensis sp. nov. (Leptolyngbyaceae, Synechococcales), a new terrestrial cyanobacterium isolated from mats collected on Signy Island, South Orkney Islands, Antarctica. PLoS One 2019; 14:e0224395. [PMID: 31682631 PMCID: PMC6827893 DOI: 10.1371/journal.pone.0224395] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 10/11/2019] [Indexed: 11/19/2022] Open
Abstract
Terrestrial cyanobacteria are very diverse and widely distributed in Antarctica, where they can form macroscopically visible biofilms on the surfaces of soils and rocks, and on benthic surfaces in fresh waters. We recently isolated several terrestrial cyanobacteria from soils collected on Signy Island, South Orkney Islands, Antarctica. Among them, we found a novel species of Nodosilinea, named here as Nodosilinea signiensis sp. nov. This new species is morphologically and genetically distinct from other described species. Morphological examination indicated that the new species is differentiated from others in the genus by cell size, cell shape, filament attenuation, sheath morphology and granulation. 16S rDNA phylogenetic analyses clearly confirmed that N. signiensis belongs to the genus Nodosilinea, but that it is genetically distinct from other known species of Nodosilinea. The D1-D1´ helix of the 16S-23S ITS region of the new species was also different from previously described Nodosilinea species. This is the first detailed characterization of a member of the genus Nodosilinea from Antarctica as well as being a newly described species.
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Affiliation(s)
- Ranina Radzi
- School of Biological Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia
| | - Narongrit Muangmai
- Department of Fishery Biology, Faculty of Fisheries, Kasetsart University, Chatuchak, Bangkok, Thailand
| | - Paul Broady
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - Wan Maznah Wan Omar
- School of Biological Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia
| | - Sebastien Lavoue
- School of Biological Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia
| | - Peter Convey
- British Antarctic Survey, Cambridge, United Kingdom
| | - Faradina Merican
- School of Biological Sciences, Universiti Sains Malaysia, Minden, Penang, Malaysia
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Roncero-Ramos B, Muñoz-Martín MÁ, Chamizo S, Fernández-Valbuena L, Mendoza D, Perona E, Cantón Y, Mateo P. Polyphasic evaluation of key cyanobacteria in biocrusts from the most arid region in Europe. PeerJ 2019; 7:e6169. [PMID: 30627491 PMCID: PMC6321753 DOI: 10.7717/peerj.6169] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 11/27/2018] [Indexed: 11/20/2022] Open
Abstract
Cyanobacteria are key microbes in topsoil communities that have important roles in preventing soil erosion, carbon and nitrogen fixation, and influencing soil hydrology. However, little is known regarding the identity and distribution of the microbial components in the photosynthetic assemblages that form a cohesive biological soil crust (biocrust) in drylands of Europe. In this study, we investigated the cyanobacterial species colonizing biocrusts in three representative dryland ecosystems from the most arid region in Europe (SE Spain) that are characterized by different soil conditions. Isolated cyanobacterial cultures were identified by a polyphasic approach, including 16S rRNA gene sequencing, phylogenetic relationship determination, and morphological and ecological habitat assessments. Three well-differentiated groups were identified: heterocystous-cyanobacteria (Nostoc commune, Nostoc calcicola, Tolypothrix distorta and Scytonema hyalinum), which play an important role in N and C cycling in soil; nonheterocystous bundle-forming cyanobacteria (Microcoleus steenstrupii, Trichocoleus desertorum, and Schizothrix cf. calcicola); and narrow filamentous cyanobacteria (Leptolyngbya frigida and Oculatella kazantipica), all of which are essential genera for initial biocrust formation. The results of this study contribute to our understanding of cyanobacterial species composition in biocrusts from important and understudied European habitats, such as the Mediterranean Basin, a hotspot of biodiversity, where these species are keystone pioneer organisms.
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Affiliation(s)
| | | | - Sonia Chamizo
- Department of Agrifood Production and Environmental Sciences, University of Florence, Florence, Italy
| | | | - Diego Mendoza
- Departamento de Biología, Universidad Autónoma de Madrid, Madrid, Spain
| | - Elvira Perona
- Departamento de Biología, Universidad Autónoma de Madrid, Madrid, Spain
| | - Yolanda Cantón
- Departamento de Agronomía, Universidad de Almería, Almería, Spain.,Centro de Investigación de Colecciones Científicas de la Universidad de Almería, Universidad de Almería, Almería, Spain
| | - Pilar Mateo
- Departamento de Biología, Universidad Autónoma de Madrid, Madrid, Spain
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Muñoz-Martín MÁ, Becerra-Absalón I, Perona E, Fernández-Valbuena L, Garcia-Pichel F, Mateo P. Cyanobacterial biocrust diversity in Mediterranean ecosystems along a latitudinal and climatic gradient. THE NEW PHYTOLOGIST 2019; 221:123-141. [PMID: 30047599 DOI: 10.1111/nph.15355] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 06/17/2018] [Indexed: 06/08/2023]
Abstract
Cyanobacteria are a key biotic component as primary producers in biocrusts, topsoil communities that have important roles in the functioning of drylands. Yet, major knowledge gaps exist regarding the composition of biocrust cyanobacterial diversity and distribution in Mediterranean ecosystems. We describe cyanobacterial diversity in Mediterranean semiarid soil crusts along an aridity gradient by using next-generation sequencing and bioinformatics analyses, and detect clear shifts along it in cyanobacterial dominance. Statistical analyses show that temperature and precipitation were major parameters determining cyanobacterial composition, suggesting the presence of differentiated climatic niches for distinct cyanobacteria. The responses to temperature of a set of cultivated, pedigreed strains representative of the field populations lend direct support to that contention, with psychrotolerant vs thermotolerant physiology being strain dependent, and consistent with their dominance along the natural gradient. Our results suggest a possible replacement, as global warming proceeds, of cool-adapted by warm-adapted nitrogen-fixing cyanobacteria (such as Scytonema) and a switch in the dominance of Microcoleus vaginatus by thermotolerant, novel phylotypes of bundle-forming cyanobacteria. These differential sensitivities of cyanobacteria to rising temperatures and decreasing precipitation, their ubiquity, and their low generation time point to their potential as bioindicators of global change.
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Affiliation(s)
- M Ángeles Muñoz-Martín
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
| | - Itzel Becerra-Absalón
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
- Departamento de Biología Comparada, Facultad de Ciencia, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Elvira Perona
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
| | - Lara Fernández-Valbuena
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
| | | | - Pilar Mateo
- Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
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Elster J, Margesin R, Wagner D, Häggblom M. Editorial: Polar and Alpine Microbiology—Earth's cryobiosphere. FEMS Microbiol Ecol 2016; 93:fiw221. [DOI: 10.1093/femsec/fiw221] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/18/2016] [Indexed: 11/12/2022] Open
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