Frequent genetic recombination in natural populations of the marine cyanobacterium <i>Microcoleus chthonoplastes</i>

Lodders, Nicole; Stackebrandt, Erko; Nübel, Ulrich

doi:10.1111/j.1462-2920.2005.00730.x

Cited by 36 publications

(30 citation statements)

References 33 publications

(44 reference statements)

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“…Phenotypic and phylogenetic analyses on 16S rRNA gene fragments done by Garcia-Pichel et al (1996) have shown that Microcoleus chthonoplastes is a cosmopolitan cyanobacterium. Interestingly, Lodders et al (2005) could provide the contrary, data on rRNA-ITS locus showed that this species sharing similar morphology differ on the genetic level. Similarly, Otsuka et al (2001) using the cpcBA intergenic spacer and 16S-23S internal transcribed spacer concluded that the six Microcystis morphospecies: M. aeruginosa, M. ichthyoblabe, M. novacekii, M. viridis, M. wesenbergii, M. flos-aquae and M. pseudofilamentosa, may possibly be unified into one species.…”

Section: Molecular Phylogeny Markers In Cyanobacterial Classificationmentioning

confidence: 85%

Taxonomy of cyanobacteria: a contribution to consensus approach

Palińska

Surosz

2014

Hydrobiologia

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Diversity of Cyanophyceae/cyanobacteria is expressed by their morphological, biochemical and physiological properties, which enable them to settle and persist in a wide range of habitats. Their diverse morphology determined their taxonomic distinction based on phenotypic properties. The oxygenic photosynthesis which characterizes cyanobacteria and their sharing of ecological niches with eukaryotic algae, prompted their treatment in the phycological circles, where they were called blue-green algae, although their prokaryotic nature, akin to bacteria, has been recognized for over a century. The cyanobacteria are named under Botanical and Bacteriological Codes, and the usage of both systems at the same time causes considerable confusion as the rules of the Botanical Code are quite different from those of the Bacteriological one. Herbarium collections are perfect subjects for intensive phylogenetic studies and therefore can contribute to discussions on the traditional and newly emerging concepts of species and speciation in prokaryotes. This article reviews the present status of the taxonomy of cyanobacteria, describes earlier, classical and recent taxonomic approaches and the trends for future, emphasizing improvements in methodology as major catalysts for the progress of this field.

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Section: Molecular Phylogeny Markers In Cyanobacterial Classificationmentioning

confidence: 85%

Taxonomy of cyanobacteria: a contribution to consensus approach

Palińska

Surosz

2014

Hydrobiologia

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“…It clustered with subgroup B2 in protein phylogeny (in agreement with other phylogenomic reconstructions 13,25 but with group A in ribosomal phylogeny (in agreement with morphological and physiological data 31 , and exceptional domain acquisition of ValtRNA synthetases 32 ). Lodders et al provided evidence that genetic recombination in natural populations of the cyanobacterium M. chthonoplastes frequently occurs 33 and that the nitrogenase cluster has been horizontally acquired 34 .This highlights the complex evolutionary history of this strain in which massive gene acquisitions have recently been reported 25 .…”

Section: Discussionmentioning

confidence: 99%

The plastid ancestor originated among one of the major cyanobacterial lineages

et al. 2014

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The primary endosymbiotic origin of chloroplasts is now well established but the identification of the present cyanobacteria most closely related to the plastid ancestor remains debated. We analyse the evolutionary trajectory of a subset of highly conserved cyanobacterial proteins (core) along the plastid lineage, those which were not lost after the endosymbiosis. We concatenate the sequences of 33 cyanobacterial core proteins that share a congruent evolutionary history, with their eukaryotic counterparts to reconstruct their phylogeny using sophisticated evolutionary models. We perform an independent reconstruction using concatenated 16S and 23S rRNA sequences. These complementary approaches converge to a plastid origin occurring during the divergence of one of the major cyanobacterial lineages that include N 2 -fixing filamentous cyanobacteria and species able to differentiate heterocysts.

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“…For example, some of the non-consistent phylogenetic signals of different gene families within the same bacterial species have been explained by HGT and HR (e.g. Hanage et al 2005;Lodders et al 2005;David and Alm 2011). It has been suggested that a part of the bacterial genome usually referred to as the core genome is more stable with less evolutionary changes.…”

Section: Speciation Factors In (Cyano)bacteriamentioning

confidence: 99%

Species concepts and speciation factors in cyanobacteria, with connection to the problems of diversity and classification

et al. 2015

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The cyanobacteria are the most important prokaryotic primary producers on Earth, inhabiting a great diversity of aquatic and terrestrial environments exposed to light. However, the evolutionary forces leading to their divergence and speciation remain largely enigmatic compared to macroorganisms due to their prokaryotic nature, including vast population sizes, and largely asexual reproduction. The advent of modern molecular techniques has facilitated an understanding of the important factors shaping cyanobacterial evolution, including horizontal gene transfer and homologous recombination. We review the forces shaping the evolution of cyanobacteria and discuss the role of cohesive forces on speciation. Further, while myriad species concepts and definitions are currently used, only a limited subset might be applied to cyanobacteria due to their asexual reproduction. Additionally, concepts based solely on phenotypes provide insufficient resolution. A monophyletic species concept which is universal may be ideal for cyanobacteria. Actual identification of the cyanobacteria is difficult due to cryptic diversity, lack of morphological variability, and frequent convergent evolutionary events. Thus, applied molecular techniques such as DNA barcoding will be useful for identifications of environmental samples. Lastly, we show that the real biodiversity of the cyanobacteria is widely underestimated, due in part to low sampling efforts, sensitivity to the molecular markers 123Biodivers Conserv (2015) 24:739-757 DOI 10.1007 employed, and the species definitions employed by researchers. In conclusion, we anticipate a rapid increase in cyanobacterial taxa described and large revisions of the system in the future as scientists adopt a common approach to cyanobacterial systematics.

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Frequent genetic recombination in natural populations of the marine cyanobacterium Microcoleus chthonoplastes

Cited by 36 publications

References 33 publications

Taxonomy of cyanobacteria: a contribution to consensus approach

Taxonomy of cyanobacteria: a contribution to consensus approach

The plastid ancestor originated among one of the major cyanobacterial lineages

Species concepts and speciation factors in cyanobacteria, with connection to the problems of diversity and classification

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