Biological Activity of<i>Rhizobium</i>sp. NGR234 Nod-factors on<i>Macroptilium atropurpureum</i>

Relić, Biserka; Talmont, Franck; Kopcińska, Joanna; Golinowski, W.; Promé, Jean‐Claude; Broughton, W. J.

doi:10.1094/mpmi-6-764

Cited by 118 publications

(62 citation statements)

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“…strain NGR234 Phaseoleae (P), Desmodieae (P) Mimoseae (M), Acacieae (M), Ingeae (M), Sophoreae (P), Dalbergieae (P), Amorpheae (P), Millettieae (P), Robinieae (P), Indigofereae (P), Loteae (P), Galegeae (P), Bossiaeae (P), Mirbelieae (P), Podalyrieae (P), Crotalarieae (P), Thermopsideae (71, 105, 194, 269c). In R. meliloti, mutation of all three copies of nodD is required to abolish nodulation (124), whereas inactivation of nodD1 is sufficient to render strain NGR234 Nod Ϫ (213). nodD products of various Rhizobium species vary in that they respond to different sets of flavonoids (72,249).…”

Section: Mesorhizobium Lotimentioning

confidence: 99%

“…In a study in Germany, Hiltner (123) prepared aqueous, bacterium-free filtrates from mature P. sativum nodules and demonstrated that they contain a substance that induces root hair formation (Hai) and deformation of the root hairs (Had) in this plant. Many attempts to define the structure of these deformation factors followed (213), but these investigations yielded fruit only in 1990, when Lerouge et al (154), working in France, showed that the substances responsible are N-acylated oligomers of N-acetyl-D-glucosamine. Since then, the Nod factor structures (the products of nod genes) of a number of rhizobia have been elucidated (see "Baroque decorations to the Nod factor core" below).…”

Section: Introductionmentioning

confidence: 99%

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Molecular Basis of Symbiotic Promiscuity

Perret

Staehelin

Broughton

2000

Microbiol Mol Biol Rev

877

630

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SUMMARY Eukaryotes often form symbioses with microorganisms. Among these, associations between plants and nitrogen-fixing bacteria are responsible for the nitrogen input into various ecological niches. Plants of many different families have evolved the capacity to develop root or stem nodules with diverse genera of soil bacteria. Of these, symbioses between legumes and rhizobia (Azorhizobium, Bradyrhizobium, Mesorhizobium, and Rhizobium) are the most important from an agricultural perspective. Nitrogen-fixing nodules arise when symbiotic rhizobia penetrate their hosts in a strictly controlled and coordinated manner. Molecular codes are exchanged between the symbionts in the rhizosphere to select compatible rhizobia from pathogens. Entry into the plant is restricted to bacteria that have the “keys” to a succession of legume “doors”. Some symbionts intimately associate with many different partners (and are thus promiscuous), while others are more selective and have a narrow host range. For historical reasons, narrow host range has been more intensively investigated than promiscuity. In our view, this has given a false impression of specificity in legume-Rhizobium associations. Rather, we suggest that restricted host ranges are limited to specific niches and represent specialization of widespread and more ancestral promiscuous symbioses. Here we analyze the molecular mechanisms governing symbiotic promiscuity in rhizobia and show that it is controlled by a number of molecular keys.

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Section: Mesorhizobium Lotimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular Basis of Symbiotic Promiscuity

Perret

Staehelin

Broughton

2000

Microbiol Mol Biol Rev

877

630

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“…A major nodulation gene, nodA, was present in all rhizobial strains studied so far and this gene specifies the transfer of an acyl moiety on the amino group of the terminal, nonreducing GlcNAc residue of the oligochitin backbone (Atkinson et al, 1994;Rö hrig et al, 1994;Debellé et al, 1996;Ritsema et al, 1996;Roche et al, 1996). When supplied exogenously to legume roots, unsubstituted chitin oligomers were unable to elicit plant responses such as root-hair deformations, cortical cell divisions, and the formation of a nodule primordium (Lerouge et al, 1990;Spaink et al, 1991;van Brussel et al, 1992;Relic et al, 1993). Similarly, O-acetylated chitin oligomers were unable to trigger cortical cell divisions when added exogenously (Schlaman et al, 1997).…”

Section: Requirement For the Presence Of An N-acyl Groupmentioning

confidence: 99%

Nodule-Inducing Activity of Synthetic Sinorhizobium meliloti Nodulation Factors and Related Lipo-Chitooligosaccharides on Alfalfa.Importance of the Acyl Chain Structure1

et al. 1999

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Sinorhizobium meliloti nodulation factors (NFs) elicit a number of symbiotic responses in alfalfa (؊7 M. The optimal chain length was C16, with the C16-LCO being more than 10-fold more active than the C12-and C18-LCOs. Unsaturations were important, and the diunsaturated 2E,9Z LCO was more active than the monounsaturated LCOs. We discuss different hypotheses for the role of the acyl chain in NF perception.

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“…Root hair deformation and curling are the early morphological changes induced by rhizobia. Purified Nod factors can cause root hair deformation at concentrations as low as 10 212 M (Lerouge et al, 1990;Spaink et al, 1991;Sanjuan et al, 1992;Margaert et al, 1993), although in most cases curling is only observed when the bacteria are present (Relic et al, 1993).…”

mentioning

confidence: 99%

A Novel ARID DNA-Binding Protein Interacts with SymRK and Is Expressed during Early Nodule Development in Lotus japonicus

et al. 2008

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During the establishment of symbiosis in legume roots, the rhizobial Nod factor signal is perceived by the host cells via receptorlike kinases, including SymRK. The NODULE INCEPTION (NIN) gene in Lotus japonicus is required for rhizobial entry into root cells and for nodule organogenesis. We describe here a novel DNA-binding protein from L. japonicus, referred to as SIP1, because it was identified as a SymRK-interacting protein. SIP1 contains a conserved AT-rich interaction domain (ARID) and represents a unique member of the ARID-containing proteins in plants. The C terminus of SIP1 was found to be responsible for its interaction with the kinase domain of SymRK and for homodimerization in the absence of DNA. SIP1 specifically binds to the promoter of LjNIN but not to that of LjCBP1 (a calcium-binding protein gene), both of which are known to be inducible by Nod factors. SIP1 recognizes two of the three AT-rich domains present in the NIN gene promoter. Deletion of one of the AT-rich domains at the NIN promoter diminishes the binding of SIP1 to the NIN promoter. The protein is localized to the nuclei when expressed as a red fluorescence fusion protein in the onion (Allium cepa) epidermal cells. The SIP1 gene is expressed constitutively in the uninfected roots, and its expression levels are elevated after infection by Mesorhizobium loti. It is proposed that SIP1 may be required for the expression of NIN and involved in the initial communications between the rhizobia and the host root cells.

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Biological Activity ofRhizobiumsp. NGR234 Nod-factors onMacroptilium atropurpureum

Cited by 118 publications

References 0 publications

Molecular Basis of Symbiotic Promiscuity

Molecular Basis of Symbiotic Promiscuity

Nodule-Inducing Activity of Synthetic Sinorhizobium meliloti Nodulation Factors and Related Lipo-Chitooligosaccharides on Alfalfa.Importance of the Acyl Chain Structure1

A Novel ARID DNA-Binding Protein Interacts with SymRK and Is Expressed during Early Nodule Development in Lotus japonicus

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