Phylogenetic evaluation of the genus Nostoc and description of Nostoc neudorfense sp. nov., from the Czech Republic

Singh, Prashant; Šnokhousová, Jana; Saraf, Aniket; Suradkar, Archana; Elster, Josef

doi:10.1099/ijsem.0.004102

Cited by 16 publications

(3 citation statements)

References 43 publications

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“…Vegetative cells may be cylindrical, barrel-shaped or spherical, solitary intercalary or terminal heterocytes and spherical or oblong akinetes [4]. The absence of strong and distinct synapomorphic features, complex life cycle events and vast morphological heterogeneity makes Nostoc a morphologically complex genus [5, 6]. With the application of a polyphasic approach, the last one and half decades have proved very crucial in the taxonomy of Nostoc and its related morphotypes.…”

Section: Introductionmentioning

confidence: 99%

Insights into the phylogenetic inconsistencies of the genus Amazonocrinis and description of epilithic Amazonocrinis malviyae sp. nov. (Cyanobacteria, Nostocales) from Jammu and Kashmir, India

Kumar

Saraf²,

Pal

et al. 2022

International Journal of Systematic and Evolutionary Microbiology

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A dark-coloured thin film of cyanobacteria growing on the bottom of a submerged stone was isolated from Basantgarh village in Udhampur district, Jammu and Kashmir, India. The isolated strain (designated 19C-PST) was characterized using a polyphasic approach. The strain exhibited typical Nostoc -like morphology with a characteristic feature of having heterocytes in series. The 16S rRNA gene phylogeny placed the strain at a well-supported and distinct node. Notably, the recently described genus, Amazonocrinis , on the addition of more 16S rRNA gene sequences, reflected a critical split, which proved to be stable and well supported in all phylogenetic analyses of the 16S rRNA gene. Interestingly, Amazonocrinis nigriterrae CENA67T (type species of the genus) clustered together with our strain 19C-PST in the 16S rRNA gene phylogenetic analysis while the rest of the members of the genus Amazonocrinis were placed at a separate and distant node. This clearly indicated that strain 19C-PST is a member of Amazonocrinis sensu stricto. However, the results of phylogenetic analysis of ITS sequences only, in strains purported to belong to Amazonocrinis did not agree with the 16S rRNA gene results and placed our strain 19C-PST in a sister clade to three strains that have not yet been speciated, UHCC 0702, NIES-4103 and SA22, with A. nigriterrae falling into a separate clade. Further, folded secondary structures of the D1–D1′, V2, BoxB and V3 helices of strain 19C-PST were found to be significantly different from those of all the phylogenetically related taxa. The study revealed an interesting case where low taxon sampling and phylogenomic interpretations came across as points of attention in cyanobacterial taxonomy. Based on the morphological, phylogenetic, 16S–23S ITS secondary structure analyses, we describe our strain as Amazonocrinis malviyae sp. nov. in accordance with the International Code of Nomenclature for algae, fungi and plants. This work also illuminates the need for further research to resolve the taxonomic discrepancies among Amazonocrinis strains.

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Section: Introductionmentioning

confidence: 99%

Insights into the phylogenetic inconsistencies of the genus Amazonocrinis and description of epilithic Amazonocrinis malviyae sp. nov. (Cyanobacteria, Nostocales) from Jammu and Kashmir, India

Kumar

Saraf²,

Pal

et al. 2022

International Journal of Systematic and Evolutionary Microbiology

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“…Curiously, some studies have highlighted that most cyanobacteria extracts, and even those species or strains that do not produce toxin, are more harmful than purified cyanotoxins by showing that cyanobacteria contain other toxic compounds beyond known toxins [ 2 , 31 , 90 , 123 ]. Toxicity in cyanobacteria is not taxa- but clone-related, and by considering the polyphyly in some genera like Nostoc , it should be elucidated if toxin producers and nonproducers belong to the same species [ 126 ]. Studies have already shown that the same species can produce toxins, or not, and even the same species may produce different toxins according to the geographical location or the physic-chemical parameter of habitats [ 2 , 80 ].…”

Section: Resultsmentioning

confidence: 99%

Cyanobacteria and Macroinvertebrate Relationships in Freshwater Benthic Communities beyond Cytotoxicity

Ubero-Pascal,

Aboal

2024

Toxins

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Cyanobacteria are harmful algae that are monitored worldwide to prevent the effects of the toxins that they can produce. Most research efforts have focused on direct or indirect effects on human populations, with a view to gain easy accurate detection and quantification methods, mainly in planktic communities, but with increasing interest shown in benthos. However, cyanobacteria have played a fundamental role from the very beginning in both the development of our planet’s biodiversity and the construction of new habitats. These organisms have colonized almost every possible planktic or benthic environment on earth, including the most extreme ones, and display a vast number of adaptations. All this explains why they are the most important or the only phototrophs in some habitats. The negative effects of cyanotoxins on macroinvertebrates have been demonstrated, but usually under conditions that are far from natural, and on forms of exposure, toxin concentration, or composition. The cohabitation of cyanobacteria with most invertebrate groups is long-standing and has probably contributed to the development of detoxification means, which would explain the survival of some species inside cyanobacteria colonies. This review focuses on benthic cyanobacteria, their capacity to produce several types of toxins, and their relationships with benthic macroinvertebrates beyond toxicity.

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“…Nostoc colonies in the Monte Alegre and Iturbide springs sites contained Chironomidae larvae, which modify their architecture to the appearance of an "ear." The second group contains the downland and calcareous Tambaque population, which are from warm water (23.5°C) highly mineralized TA B L E 2 Morphological characteristics (average, minimum, and maximum, n = 50) of the Nostoc populations in streams from central Mexico and other species of the genus (Cai et al, 2021;Komárek, 2013;Mesfin et al, 2020;Singh et al, 2020). (1528 μS · cm −1 ), high DO (8.4 mg · L −1 ), low nutrients (DIN 0.097 mg · L −1 and soluble reactive phosphorous 0.02), and high current velocity (0.80 m · s −1 ).…”

Section: Ecology and Distributionmentioning

confidence: 99%

Description of two new species of Nostoc (Nostocales, Cyanobacteria) from central Mexico, using morphological, ecological, and molecular attributes

Carmona Jiménez,

Caro Borrero,

Becerra‐Absalón

et al. 2023

Journal of Phycology

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The present study describes two new Nostoc species, N. montejanii and N. tlalocii, based on a polyphasic approach that combines morphological, ecological, and genetic characteristics. The five investigated populations, including those from newly collected material from central Mexico, were observed to possess morphological features characteristic of the Nostoc genus. Results showed that both new species are strictly associated with running water, and they show clear differences in their habitat preferences. The 16S rRNA gene sequences of the five strains displayed between 98% and 99% similarity to the genus Nostoc sensu stricto. The 16S rRNA gene phylogenetic analyses inferred using Bayesian inference, maximum likelihood, and parsimony methods, placed these five strains in two separate clades distinct from other Nostoc species. The secondary structures of the 16S–23S internal transcribed spacer rRNA region in the two new species showed >10.5% dissimilarities in the operons when compared with other Nostoc species. In addition, clear morphological differences were observed between the two Mexican species, including the color of the colonies (black in N. montejanii and green in N. tlalocii), the size of the cells (greater in N. montejanii), and the number of polyphosphate granules present in the cells (one in N. montejanii and up to four in N. tlalocii).

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Phylogenetic evaluation of the genus Nostoc and description of Nostoc neudorfense sp. nov., from the Czech Republic

Cited by 16 publications

References 43 publications

Insights into the phylogenetic inconsistencies of the genus Amazonocrinis and description of epilithic Amazonocrinis malviyae sp. nov. (Cyanobacteria, Nostocales) from Jammu and Kashmir, India

Insights into the phylogenetic inconsistencies of the genus Amazonocrinis and description of epilithic Amazonocrinis malviyae sp. nov. (Cyanobacteria, Nostocales) from Jammu and Kashmir, India

Cyanobacteria and Macroinvertebrate Relationships in Freshwater Benthic Communities beyond Cytotoxicity

Description of two new species of Nostoc (Nostocales, Cyanobacteria) from central Mexico, using morphological, ecological, and molecular attributes

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