Diversity of the Cyanobacteria

Dvořák, Petr; Casamatta, Dale A.; Hašler, Petr; Jahodářová, Eva; Norwich, Alyson R.; Poulíčková, Aloisie

doi:10.1007/978-3-319-46261-5_1

Cited by 41 publications

(47 citation statements)

References 147 publications

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“…In both freshly-collected and cultured materials, thalli were delicate and the antheridia were shed early, the latter interpreted as an environmental adaptation to this highly-isolated and selective arid-climate freshwater ecosystem. Cyanoprokaryotes have wider biogeographic distributional niches than do other eukaryotic algal groups due to their different ecophysiological adaptive mechanisms to survive in arid-climate habitats and in addition to the production of several types of resting stages, which facilitate their environmental resistance and dispersal by wind or migrating animals [612].…”

Section: Arid-climate Freshwater Habitatsmentioning

confidence: 99%

Characteristics, Main Impacts, and Stewardship of Natural and Artificial Freshwater Environments: Consequences for Biodiversity Conservation

Cantonati

Poikāne

Pringle

et al. 2020

Water

164

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In this overview (introductory article to a special issue including 14 papers), we consider all main types of natural and artificial inland freshwater habitas (fwh). For each type, we identify the main biodiversity patterns and ecological features, human impacts on the system and environmental issues, and discuss ways to use this information to improve stewardship. Examples of selected key biodiversity/ecological features (habitat type): narrow endemics, sensitive (groundwater and GDEs); crenobionts, LIHRes (springs); unidirectional flow, nutrient spiraling (streams); naturally turbid, floodplains, large-bodied species (large rivers); depth-variation in benthic communities (lakes); endemism and diversity (ancient lakes); threatened, sensitive species (oxbow lakes, SWE); diverse, reduced littoral (reservoirs); cold-adapted species (Boreal and Arctic fwh); endemism, depauperate (Antarctic fwh); flood pulse, intermittent wetlands, biggest river basins (tropical fwh); variable hydrologic regime—periods of drying, flash floods (arid-climate fwh). Selected impacts: eutrophication and other pollution, hydrologic modifications, overexploitation, habitat destruction, invasive species, salinization. Climate change is a threat multiplier, and it is important to quantify resistance, resilience, and recovery to assess the strategic role of the different types of freshwater ecosystems and their value for biodiversity conservation. Effective conservation solutions are dependent on an understanding of connectivity between different freshwater ecosystems (including related terrestrial, coastal and marine systems).

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Section: Arid-climate Freshwater Habitatsmentioning

confidence: 99%

Characteristics, Main Impacts, and Stewardship of Natural and Artificial Freshwater Environments: Consequences for Biodiversity Conservation

Cantonati

Poikāne

Pringle

et al. 2020

Water

164

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“…Cyanobacteria are a diverse group of photosynthetic prokaryotes, with an estimated number of 8000 species distributed by 150 genera, that, in turn, colonize a variety of aquatic and terrestrial environments, from temperate to tropical and polar regions worldwide [ 1 , 2 ]. Along their evolutionary path, cyanobacteria have developed a multitude of strategies enabling them to adapt and survive in such distinct environments.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant and Cytoprotective Properties of Cyanobacteria: Potential for Biotechnological Applications

Guerreiro

Andrade

Menezes

et al. 2020

Toxins

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Antioxidant compounds from cyanobacteria may constitute a natural alternative to current synthetic antioxidants, which contain preservatives and suspected toxicity. In this work, we evaluate the antioxidant potential of cyanobacterial strains of distinct species/genus isolated from freshwater (n = 6), soil (n = 1) and wastewater (n = 1) environments. Lyophilized biomass obtained from in-vitro cultures of those strains was extracted with ethanol and methanol. The antioxidant potential was evaluated by chemical (DPPH scavenging method, β-carotene bleaching assay, determination of total phenolic and total flavonoid compounds) and biological (H2O2-exposed HEK293T cell line model) approach. Some strains showed high yields of antioxidant activity by the DPPH assay (up to 10.7% IP/20.7 TE μg/mL) and by the β-carotene bleaching assay (up to 828.94 AAC), as well as significant content in phenolic (123.16 mg EAG/g DW) and flavonoid (900.60 mg EQR/g DW) compounds. Normalization of data in a “per cell” or “per cell volume” base might facilitate the comparison between strains. Additionally, most of the cyanobacterial extracts conferred some degree of protection to HEK293T cells against the H2O2-induced cytotoxicity. Freshwater Aphanizomenon gracile (LMECYA 009) and Aphanizomenon flos-aquae (LMECYA 088), terrestrial Nostoc (LMECYA 291) and wastewater Planktothrix mougeotii (LEGE 06224) seem to be promising strains for further investigation on cyanobacteria antioxidant potential.

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“…in several phylogenetic clades and the separation of Nostoc spp. into different clades [ 18 ]. Symbiotic Nostoc strains of many cyanolichens, including both bi- and tripartite species of Peltigera , have traditionally been called Nostoc punctiforme , but cyanobacterial strains resembling Nostoc muscorum , Nostoc sphaericum and Nostoc linckia have also been cultured from Peltigera species [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Distinctive characters of Nostoc genomes in cyanolichens

Gagunashvili

Andrésson

2018

BMC Genomics

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BackgroundCyanobacteria of the genus Nostoc are capable of forming symbioses with a wide range of organism, including a diverse assemblage of cyanolichens. Only certain lineages of Nostoc appear to be able to form a close, stable symbiosis, raising the question whether symbiotic competence is determined by specific sets of genes and functionalities.ResultsWe present the complete genome sequencing, annotation and analysis of two lichen Nostoc strains. Comparison with other Nostoc genomes allowed identification of genes potentially involved in symbioses with a broad range of partners including lichen mycobionts. The presence of additional genes necessary for symbiotic competence is likely reflected in larger genome sizes of symbiotic Nostoc strains. Some of the identified genes are presumably involved in the initial recognition and establishment of the symbiotic association, while others may confer advantage to cyanobionts during cohabitation with a mycobiont in the lichen symbiosis.ConclusionsOur study presents the first genome sequencing and genome-scale analysis of lichen-associated Nostoc strains. These data provide insight into the molecular nature of the cyanolichen symbiosis and pinpoint candidate genes for further studies aimed at deciphering the genetic mechanisms behind the symbiotic competence of Nostoc. Since many phylogenetic studies have shown that Nostoc is a polyphyletic group that includes several lineages, this work also provides an improved molecular basis for demarcation of a Nostoc clade with symbiotic competence.Electronic supplementary materialThe online version of this article (10.1186/s12864-018-4743-5) contains supplementary material, which is available to authorized users.

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Diversity of the Cyanobacteria

Cited by 41 publications

References 147 publications

Characteristics, Main Impacts, and Stewardship of Natural and Artificial Freshwater Environments: Consequences for Biodiversity Conservation

Characteristics, Main Impacts, and Stewardship of Natural and Artificial Freshwater Environments: Consequences for Biodiversity Conservation

Antioxidant and Cytoprotective Properties of Cyanobacteria: Potential for Biotechnological Applications

Distinctive characters of Nostoc genomes in cyanolichens

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