Journal ArticleDOI
Bradyrhizobium japonicum mutants defective in cyclic ß-glucan synthesis show enhanced sensitivity to plant defense responses
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TLDR
Investigation of the nitrogen-fixing soybean symbiont Bradyrhizobium japonicum found mutants defective in the biosynthesis of cyclic β-(1→3)-(1→6)-glucans showed higher susceptibility to both phytoalexin and H2O2.Abstract:
Susceptibility of the nitrogen-fixing soybean symbiont Bradyrhizobium japonicum to inducible plant defense metabolites such as phytoalexin and H2O2, was investigated. On the wild-type strain USDA 110 the soybean phytoalexin, glyceollin, showed bacteriostatic activity. Viable bacteria isolated from intact nodules were adapted to glyceollin. H2O2 in physiological concentrations did not affect wild-type bacteria. B. japonicum mutants defective in the biosynthesis of cyclic beta-(1-->3)-(1-->6)-glucans showed higher susceptibility to both phytoalexin and H2O2.read more
Citations
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Curdlan and other bacterial (1→3)-β-d-glucans
TL;DR: This review includes information on the structure, properties and molecular genetics of the bacterial (1→3)-β-glucans, together with an overview of the physiology and biotechnology of curdlan production and applications of this biopolymer and its derivatives.
Journal ArticleDOI
Surface polysaccharide involvement in establishing the rhizobium-legume symbiosis.
TL;DR: All the polysaccharide classes seem to be involved in complex processes of plant defense inhibition that allow plant root invasion.
Journal ArticleDOI
Rhizobia and plant-pathogenic bacteria: common infection weapons.
TL;DR: The success of invasion and survival within the host also requires that rhizobia and pathogens suppress and/or overcome plant defence responses triggered after microbial recognition, a process in which surface polysaccharides, antioxidant systems, ethylene biosynthesis inhibitors and virulence genes are involved as discussed by the authors.
Journal ArticleDOI
Bacterial Cyclic β-(1,2)-Glucan Acts in Systemic Suppression of Plant Immune Responses
Luciano A. Rigano,Caroline Payette,Geneviève Brouillard,María Rosa Marano,Laura Abramowicz,Pablo S. Torres,Maximina H. Yun,Atilio Pedro Castagnaro,Mohamed El Oirdi,Vanessa Dufour,Florencia Malamud,John Maxwell Dow,Kamal Bouarab,Adrián Alberto Vojnov +13 more
TL;DR: Systemic suppression is a novel counterdefensive strategy that may facilitate pathogen spread in plants and may have important implications for the understanding of plant–pathogen coevolution and for the development of phytoprotection measures.
Journal ArticleDOI
Characterization of ndvD, the third gene involved in the synthesis of cyclic beta-(1 --> 3),(1 --> 6)-D-glucans in Bradyrhizobium japonicum.
TL;DR: A new open reading frame (ORF1) is reported located in the intergenic region between ndvB and ndVC, which is essential for beta-glucan synthesis and effective nodulation of G. max.
References
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Journal ArticleDOI
The oxidative burst in plant disease resistance
TL;DR: Emerging data indicate that the oxidative burst reflects activation of a membrane-bound NADPH oxidase closely resembling that operating in activated neutrophils, which underlies the expression of disease-resistance mechanisms.
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Transmissible Resistance to Penicillin G, Neomycin, and Chloramphenicol in Rhizobium japonicum
Michael A. Cole,Gerald H. Elkan +1 more
TL;DR: The genetic basis for resistance to a number of antibiotics was examined in Rhizobium japonicum, and resistance to penicillin G, neomycin, and chloramphenicol appears to be mediated by an extrachromosomal element similar to that found in the Enterobacteriaceae.
Isoflavonoid-Inducible Resistance tothePhytoalexin Glyceollin inSoybean Rhizobia
TL;DR: Isoflavonoid-inducible resistance must be ascribed an important role for survival of rhizobia in the rhizosphere of soybean roots.
Journal ArticleDOI
Structural studies of a phosphocholine substituted β-(1,3);(1,6) macrocyclic glucan from Bradyrhizobium japonicum USDA 110
Dominique Rolin,Philip E. Pfeffer,Stanley F. Osman,Benjamin S. Szwergold,Francis Kappler,Alan J. Benesi +5 more
TL;DR: Structural characterization of this compound with a molecular weight of 2271 (FAB mass spectrometry) demonstrated that the molecule contained beta-(1,3); beta-1,6; beta-linked non-reducing terminal glucose units in the ratio of 5:6:1:1, respectively, as well as one C-6 substituted phosphocholine (PC) moiety associated with one group of (1, 3) beta-glucose residues.