Frankia asymbiotica sp. nov., a non-infective actinobacterium isolated from Morella californica root nodule

Nouioui, Imen; Gueddou, Abdellatif; Ghodhbane‐Gtari, Faten; Rhode, Manfred; Gtari, Maher; Klenk, Hans‐Peter

doi:10.1099/ijsem.0.002153

Cited by 34 publications

(16 citation statements)

References 23 publications

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“…Although symbiotic Frankia were first described from an alder root in the 1860s (Woronin, 1866) (Gtari et al, 2019;Normand et al, 2018;Nouioui et al, 2016Nouioui, Ghodhbane-Gtari, Rhode, et al, 2018;Nouioui, Gueddou, Ghodhbane-Gtari, Rhode, et al, 2017). Candidatus Frankia californiensis, Ca.…”

Section: Comparison Of Ac Tinorhiz Al and Leg Ume Symb I Os E Smentioning

confidence: 99%

Evolution and biogeography of actinorhizal plants and legumes: A comparison

Ardley

Sprent

2021

Journal of Ecology

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1. The symbiosis between plants and nitrogen-fixing bacteria is widespread among legumes and actinorhizal plants within the nitrogen-fixing root nodule (NFN) clade. However, there are major differences, as well as similarities, in the symbioses between actinorhizal plants and Frankia and those of legumes and their associated rhizobia. 2. This review provides an overview of NFN symbioses. We outline the evolution and biogeography of actinorhizal plants and legumes and compare and contrast their microsymbionts and symbiotic processes. 3. Within the NFN clade, a far greater number of nodulated legumes exists, compared with actinorhizal plants, and legumes have a much wider biogeographical distribution. There are genetic and physiological differences between free-living diazotrophic Frankia and the phylogenetically diverse rhizobia, most strains of which are unable to fix N 2 ex planta. Actinorhizal nodules are modified lateral roots with a central vascular system, whereas legume nodules are stem-like organs with peripheral vascular systems. Most legumes contain their microsymbionts within symbiosomes, rather than the infection threads found in actinorhizal nodule cells. Legumes have greater control of their microsymbionts, and those within the Inverted Repeat Lacking Clade impose terminal differentiation on their bacteroids. Legumes also have effective processes for autoregulation of nodulation and downregulation of N 2 fixation in response to high levels of soil N. These features of the legume-rhizobia symbiosis have led to increased efficiencies in N 2 fixation. 4. Synthesis. We suggest that 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 N 2 fixation, are 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. K E Y W O R D S biogeography and macroecology, biological flora, dispersal, evolutionary ecology, global change ecology, plant development and life-history traits, plant-climate interactions | 3

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Section: Comparison Of Ac Tinorhiz Al and Leg Ume Symb I Os E Smentioning

confidence: 99%

Evolution and biogeography of actinorhizal plants and legumes: A comparison

Ardley

Sprent

2021

Journal of Ecology

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“…Frankia coriariae BMG5.1 T 16 , Candidatus Frankia datiscae Dg1 17 , Candidatus Frankia californiensis Dg2 18 and Candidatus Frankia meridionalis Cppng1 19 represent species in cluster 2, while Frankia elaeagni BMG5.12 T 12 , Frankia discariae BCU110501 T 20 , Frankia soli NRRL B-16219 T 21 and Frankia irregularis G2 T 22 are species in cluster 3. Cluster 4 frankiae are represented by three species, Frankia inefficax EuI1c T 23 , Frankia asymbiotica M16386 T 24 and Frankia saprophytica CN3 T 25 .…”

Section: Introductionmentioning

confidence: 99%

Draft genomes of non-nitrogen-fixing Frankia strains

Carlos‐Shanley¹,

Guerra²,

Hahn³

2021

J. Genomics

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In this study, we describe the genomes of two novel candidate species of non-nitrogen fixing Frankia that were isolated from the root nodules of Coriaria nepalensis and Alnus glutinosa , genospecies CN and Ag, respectively . Comparative genomic analyses revealed that both genospecies lack genes essential for nitrogen-fixation and possess genes involved in the degradation of plant cell walls. Additionally, we found distinct biosynthetic gene clusters in each genospecies. The availability of these genomes will contribute to the study of the taxonomy and evolution of actinorhizal symbioses.

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“…The standard approach based on DNA–DNA hybridization [11] has identified several genomospecies but since these had few distinguishing physiological features, species were not named, except for Frankia alni . One had to wait for genomes to become available [12] and on a concerted international effort to see first species Frankia alni emended[13] , and later, several others proposed: Frankia casuarinae , Frankia elaeagni [13], Frankia asymbiotica [14], Frankia canadensis [15] , Frankia coriariae [16], Frankia discariae [17], Frankia inefficax [18] , Frankia irregularis [19], Frankia saprophytica [20], Frankia soli [21] , Frankia torreyi [8], and even three unisolated species: ' Candidatus Fankia californiensis' [22], ' Candidatus Frankia datiscae' [23] and ' Candidatus Frankia meridionalis' [24].…”

Section: Introductionmentioning

confidence: 99%

Proposal of 'Candidatus Frankia alpina', the uncultured symbiont of Alnus alnobetula and A. incana that forms spore-containing nitrogen-fixing root nodules

Pozzi

Herrera-Belaroussi

Schwob

et al. 2020

International Journal of Systematic and Evolutionary Microbiology

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The members of the genus Frankia are, with a few exceptions, a group of nitrogen-fixing symbiotic actinobacteria that nodulate mostly woody dicotyledonous plants belonging to three orders, eight families and 23 genera of pioneer dicots. These bacteria have been characterized phylogenetically and grouped into four molecular clusters. One of the clusters, cluster 1 contains strains that induce nodules on Alnus spp. (Betulaceae), Myrica spp., Morella spp. and Comptonia spp. (Myricaceae) that have global distributions. Some of these strains produce not only hyphae and vesicles, as other cluster 1 strains do, but also numerous sporangia in their host symbiotic tissues, hence their phenotype being described as spore-positive (Sp+). While Sp+ strains have resisted repeated attempts at cultivation, their genomes have recently been characterized and found to be different from those of all described species, being markedly smaller than their phylogenetic neighbours. We thus hereby propose to create a 'Candidatus Frankia alpina' species for some strains present in nodules of Alnus alnobetula and A. incana that grow in alpine environments at high altitudes or in subarctic environments at high latitudes.

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Frankia asymbiotica sp. nov., a non-infective actinobacterium isolated from Morella californica root nodule

Cited by 34 publications

References 23 publications

Evolution and biogeography of actinorhizal plants and legumes: A comparison

Evolution and biogeography of actinorhizal plants and legumes: A comparison

Draft genomes of non-nitrogen-fixing Frankia strains

Proposal of 'Candidatus Frankia alpina', the uncultured symbiont of Alnus alnobetula and A. incana that forms spore-containing nitrogen-fixing root nodules

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