Proposal of 'Candidatus Frankia californiensis', the uncultured symbiont in nitrogen-fixing root nodules of a phylogenetically broad group of hosts endemic to western North America.

@article{Normand2017ProposalO,
  title={Proposal of 'Candidatus Frankia californiensis', the uncultured symbiont in nitrogen-fixing root nodules of a phylogenetically broad group of hosts endemic to western North America.},
  author={P. Normand and T. Nguyen and Kai Battenberg and A. Berry and B. V. Heuvel and Maria P. Fernandez and K. Pawlowski},
  journal={International journal of systematic and evolutionary microbiology},
  year={2017},
  volume={67 10},
  pages={
          3706-3715
        }
}
The genus Frankia comprises a group of nitrogen-fixing actinobacteria that form root-nodule symbioses with perennial dicotyledonous plants in the nitrogen-fixing clade. These bacteria have been characterized phylogenetically and grouped into four clusters (clusters 1-4). Cluster 2 contains mostly uncultured strains that induce nodules on species of the genera Datisca (Datiscaceae), Coriaria (Coriariaceae), Ceanothus (Rhamnaceae) and several genera in the family Rosaceae (Cercocarpus… Expand
Proposal of 'Candidatus Frankia alpina', the uncultured symbiont of Alnus alnobetula and A. incana that forms spore-containing nitrogen-fixing root nodules.
TLDR
A 'Candidatus Frankia alpina' species is proposed to be created for some strains present in nodules of Alnus alnobetula and A. incana that grow in alpine environments at high altitudes or in subarctic environments athigh latitudes. Expand
An update on the taxonomy of the genus Frankia Brunchorst, 1886, 174AL
TLDR
This review focuses on recent results from taxongenomics and phenoarray approaches to the positioning and the structuring of the genus Frankia, which is considered the single member of the family Frankiaceae within the monophyletic order, Frankiales. Expand
Candidatus Frankia nodulisporulans sp. nov., an Alnus glutinosa-infective Frankia species unable to grow in pure culture and able to sporulate in-planta.
TLDR
A new Frankia species is described, for three non-isolated strains obtained from Alnus glutinosa in France and Sweden, respectively, which can nodulate several AlnUS species but have resisted all attempts at isolation in pure culture. Expand
Frankia torreyi sp. nov., the first actinobacterium of the genus Frankia Brunchorst 1886, 174AL isolated in axenic culture
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Based on the phenotypic, phylogenetic and genomic data, strain CpI1T warrants classification as the type strain of a novel species, for which the name Frankia torreyi sp. Expand
Dryas as a Model for Studying the Root Symbioses of the Rosaceae
TLDR
A basic toolkit for the culture, transient transformation and genetic analysis of Dryas sp. Expand
Frankia-Enriched Metagenomes from the Earliest Diverging Symbiotic Frankia Cluster: They Come in Teams
TLDR
Frankia strains induce the formation of nitrogen-fixing nodules on roots of actinorhizal plants, and an analysis of the evolution and distribution of the host plants indicated that bursts of transposition may have coincided with niche competition with other cluster-2 Frankia strains. Expand
Frankia canadensis sp. nov., isolated from root nodules of Alnus incana subspecies rugosa.
TLDR
On the basis of phylogenetic, genomic, proteomic and phenotypic results, strain ARgP5T is considered to represent a novel species within the genus Frankia for which the name Frankia canadensis sp. Expand
Evolution and biogeography of actinorhizal plants and legumes: A comparison
TLDR
These characteristic features of the legume‐rhizobia symbiosis, specifically legumes' greater flexibility in the choice of microsymbiont partner and the evolution of increased efficiencies in N2 fixation, are suggested to be factors that can explain why the majority of species within the Leguminosae have retained the ability to nodulate and how this has contributed to their evolutionary success. Expand
Robust Frankia phylogeny, species delineation and intraspecies diversity based on Multi-Locus Sequence Analysis (MLSA) and Single-Locus Strain Typing (SLST) adapted to a large sample size.
TLDR
The pgk marker - providing the longest sequence, highest mean genetic divergence and least occurrence of LGT - was used to survey an unequalled number of Alnus-infective Frankia - mainly uncultured strains from a broad range of host-species and geographic origins. Expand
The Peptidoglycan Biosynthesis Gene murC in Frankia: Actinorhizal vs. Plant Type
TLDR
There is clear sequence divergence between both types of Frankia MurC, and Frankia murC1 is in the process of being replaced by murC2, indicating selection in favour of murC 2, but protein modelling showed no major structural differences between the MurCs from any phylogenetic group examined. Expand
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References

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Low genetic diversity among Frankia spp. strains nodulating sympatric populations of actinorhizal species of Rosaceae, Ceanothus (Rhamnaceae) and Datisca glomerata (Datiscaceae) west of the Sierra Nevada (California).
TLDR
The results suggest that a narrow range of Group 1 Frankia spp. Expand
Molecular phylogeny of the genus Frankia and related genera and emendation of the family Frankiaceae.
TLDR
The phylogenetic tree revealed that there was greater diversity among the Alnus-infective strains than among the strains that infect other host plants, and the family Frankiaceae should be emended so that the genera Geodermatophilus and "Blastococcus" are excluded and only the genus Frankia is retained. Expand
Assessing the phylogeny of Frankia-actinorhizal plant nitrogen-fixing root nodule symbioses with Frankia 16S rRNA and glutamine synthetase gene sequences.
TLDR
Clock-like mutation rates in glnA sequence alignments indicate that all three major Frankia clades diverged early during the emergence of eudicots in the Cretaceous period, and suggest that present-day symbioses are the result of an ancestral symbiosis that emerged before the divergence of extant actinorhizal plants. Expand
Absence of Cospeciation between the Uncultured Frankia Microsymbionts and the Disjunct Actinorhizal Coriaria Species
TLDR
Phylogenetic reconstruction indicated that the radiations of Frankia strains and Coriaria species are not congruent, and the lack of cospeciation between the two symbiotic partners may be explained by host shift at high taxonomic rank together with wind dispersal and/or survival in nonhost rhizosphere. Expand
Candidatus Frankia Datiscae Dg1, the Actinobacterial Microsymbiont of Datisca glomerata, Expresses the Canonical nod Genes nodABC in Symbiosis with Its Host Plant
TLDR
Evidence indicates an Actinobacterial origin of rhizobial Nod factors in Frankia strains, which belong to the nitrogen-fixing plant clade and bacterial signaling in both groups involves the common symbiotic pathway used by arbuscular mycorrhizal fungi. Expand
An assemblage of Frankia Cluster II strains from California contains the canonical nod genes and also the sulfotransferase gene nodH
TLDR
The first Frankia cluster II genome from North America (California) is presented, Dg2, which represents a metagenome of two major and one minor strains and contains the canonical nod genes nodABC for the production of lipochitooligosaccharide Nod factors, but also two copies of the sulfotransferase gene nodH. Expand
The Influence of the Host Plant Is the Major Ecological Determinant of the Presence of Nitrogen-Fixing Root Nodule Symbiont Cluster II Frankia Species in Soil
TLDR
A strong influence of the host plant on soil distribution of cluster II Frankia spp. Expand
Biology of Frankia strains, actinomycete symbionts of actinorhizal plants.
TLDR
Sufficient information about the relationship of Frankia strains to other bacteria, and to each other, is now available to warrant the creation of some species based on phenotypic and genetic criteria. Expand
Diversity and Distribution of Frankia Strains Symbiotic with Ceanothus in California
TLDR
It is concluded that the identity of Frankia strains inhabiting Ceanothus nodules may involve interactions between host species specificity and geographic isolation. Expand
Frankia coriariae sp. nov., an infective and effective microsymbiont isolated from Coriaria japonica.
TLDR
The taxonomic description of a nitrogen-fixing actinobacterium, strain BMG5.1T, as a novel species within the genus Frankia was based on a polyphasic approach, and it fulfilled Koch's postulates by inducing effective nodules on Coriaria japonica. Expand
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