Symbiosis within Symbiosis: Evolving Nitrogen-Fixing Legume Symbionts

Remigi, Philippe; Zhu, Jun; Young, J. Peter W.; Masson‐Boivin, Catherine

doi:10.1016/j.tim.2015.10.007

Cited by 236 publications

(194 citation statements)

References 101 publications

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“…The 16S rRNA gene sequence on its own can delineate rhizobia at the genus level [Lindstrom et al 2015]. The nif and nod genes are often carried on plasmids or symbiotic islands and these genes can be transferred (lateral transfer) between different bacterial species within a genus and more rarely across genera [Vinuesa et al 2005b; Cummings et al 2009; Remigi et al 2016]. Bacterial species from a range of genera in the alphaproteobacteria (most commonly Bradyrhizobium, Ensifer (= Sinorhizobium), Mesorhizobium, and Rhizobium) and two genera in the betaproteobacteria (Burkholderia (= Paraburkholderia) and Cupriavidus) can form functional (N2 fixing) nodules on specific legumes (Tables 1-4).…”

Section: Introductionmentioning

confidence: 99%

Specificity in Legume-Rhizobia Symbioses

Andrews

2016

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Abstract:The Leguminosae (legume family) is divided into three sub-families, the Caesalpiniodeae, Mimosoideae and Papilionoideae. Here, the literature on legume-rhizobia symbioses was reviewed, and genotypically characterised rhizobia related to the taxonomy of the legumes they were isolated from. Only data from field soils were considered. The objective of the work was to assess to what extent legume specificity for rhizobial symbiont is related to legume taxonomy. Bradyrhizobium spp. were the exclusive rhizobial symbionts of species in the Caesalpinioideae but data are limited. Where tested, species within the two Mimosoideae tribes, Ingeae and Mimoseae were nodulated by different rhizobial genera. Generally, Papilionoideae species with indeterminate nodules were promiscuous in relation to rhizobial symbionts but high specificity for rhizobial partners appears to hold at tribe level for the Fabeae (Rhizobium spp.), genus level for Medicago (Ensifer spp.), Cytisus (Bradyrhizobium spp.) and Lupinus (Bradyrhizobium spp.), and species level for Galega spp. (Neorhizobium galegeae), Hedysarum coronarium (Rhizobium sullae), Cicer arietinum (Mesorhizobium spp.) and New Zealand native Sophora spp. (Mesorhizobium spp.). High legume specificity for rhizobial symbionts was linked to specific rhizobial symbiosis genes. For Papilionoideae species with determinate nodules, the Dalbergieae were primarily nodulated by Bradyrhizobium but were promiscuous with respect to Bradyrhizobium spp. while those in the Desmodieae, Phaseoleae, Psoraleae and Loteae were promiscuous across different rhizobial genera. Possible advantages and disadvantages of high specificity or promiscuity are discussed.

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Section: Introductionmentioning

confidence: 99%

Specificity in Legume-Rhizobia Symbioses

Andrews

2016

Preprint

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“…Rhizobia have evolved via horizontal transfer of essential nodulation and nitrogen fixation genes that are carried by either large plasmids or genomic islands. Exchange of symbiotic material between rhizobial species and genera has been frequent during evolution (8). The symbiosis islands of the Mesorhizobium, Azorhizobium, and Bradyhizobium species are mainly located on the chromosome (9-11).…”

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confidence: 99%

Plant nodulation inducers enhance horizontal gene transfer of Azorhizobium caulinodans symbiosis island

Ling

Wang

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Horizontal gene transfer (HGT) of genomic islands is a driving force of bacterial evolution. Many pathogens and symbionts use this mechanism to spread mobile genetic elements that carry genes important for interaction with their eukaryotic hosts. However, the role of the host in this process remains unclear. Here, we show that plant compounds inducing the nodulation process in the rhizobium-legume mutualistic symbiosis also enhance the transfer of symbiosis islands. We demonstrate that the symbiosis island of the Sesbania rostrata symbiont, Azorhizobium caulinodans, is an 87.6-kb integrative and conjugative element (ICE Ac ) that is able to excise, form a circular DNA, and conjugatively transfer to a specific site of gly-tRNA gene of other rhizobial genera, expanding their host range. The HGT frequency was significantly increased in the rhizosphere. An ICE Aclocated LysR-family transcriptional regulatory protein AhaR triggered the HGT process in response to plant flavonoids that induce the expression of nodulation genes through another LysR-type protein, NodD. Our study suggests that rhizobia may sense rhizosphere environments and transfer their symbiosis gene contents to other genera of rhizobia, thereby broadening rhizobial host-range specificity.horizontal gene transfer | host-range | integrative and conjugative element | naringenin | nodulation

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“…Legumes can establish a nitrogen-fixing nodulation symbiosis with phylogenetically diverse bacteria (Remigi et al, 2016) that are collectively named rhizobia. The developmentally and biochemically diverse nodules formed by legumes are typically classified as being either determinate or indeterminate (Hirsch, 1992;Sprent, 2001).…”

Section: Introductionmentioning

confidence: 99%

The evolution of determinate and indeterminate nodules within the Papilionoideae subfamily

Ren

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Symbiosis within Symbiosis: Evolving Nitrogen-Fixing Legume Symbionts

Cited by 236 publications

References 101 publications

Specificity in Legume-Rhizobia Symbioses

Specificity in Legume-Rhizobia Symbioses

Plant nodulation inducers enhance horizontal gene transfer of Azorhizobium caulinodans symbiosis island

The evolution of determinate and indeterminate nodules within the Papilionoideae subfamily

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