Browsing by Author "Vinardell González, José María"
Now showing items 1-20 of 24
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A purL mutant of Sinorhizobium fredii HH103 is symbiotically defective and altered in its lipopolysaccharide [Article]
(Microbiology Society, 2003)The pleiotropic phenotype of an auxotrophic purL mutant (SVQ295) of Sinorhizobium fredii HH103 has been investigated. SVQ295 forms colonies that are translucent, produce more slime and absorb less Congo red than those ...
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A pyrF auxotrophic mutant of Sinorhizobium fredii HH103 impaired in its symbiotic interaction with soybean and other legumes [Article]
(Sociedad Española de Microbiología. Viguera Editores, 2007)Transposon Tn5-Mob mutagenesis allowed the selection of a Sinorhizobium fredii HH103 mutant derivative (SVQ 292) that requires the presence of uracil to grow in minimal media. The mutated gene, pyrF, codes for an ...
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A transcriptomic analysis of the effect of genistein on Sinorhizobium fredii HH103 reveals novel rhizobial genes putatively involved in symbiosis [Article]
(Nature Publishing Group, 2016)Sinorhizobium fredii HH103 is a rhizobial soybean symbiont that exhibits an extremely broad host-range. Flavonoids exuded by legume roots induce the expression of rhizobial symbiotic genes and activate the bacterial protein ...
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Bacterial Molecular Signals in the Sinorhizobium fredii-Soybean Symbiosis [Article]
(MDPI AG, 2016)Sinorhizobium (Ensifer) fredii (S. fredii) is a rhizobial species exhibiting a remarkably broad nodulation host-range. Thus, S. fredii is able to effectively nodulate dozens of different legumes, including plants forming ...
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Deciphering the Symbiotic Significance of Quorum Sensing Systems of Sinorhizobium fredii HH103 [Article]
(MDPI, 2020)Quorum sensing (QS) is a bacterial cell-to-cell signaling mechanism that collectively regulates and synchronizes behaviors by means of small diffusible chemical molecules. In rhizobia, QS systems usually relies on the ...
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Estudio del papel simbiótico de los polisacáridos superficiales de Sinorhizobium fredii HH103 [PhD Thesis]
(2012)Nuestro grupo de investigación lleva años estudiando los polisacáridos superficiales de la bacteria Sinorhizobium fredii HH103 y cómo éstos intervienen en el establecimiento de una simbiosis funcional con sus leguminosas ...
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Estudios genéticos y fisiológicos del gen regulador nodD de Rhizobium fredii ii HH103 [PhD Thesis]
(1997-06-16)En nuestro laboratorio trabajamos con diversas estirpes de Rhizobium fredii. En el trabajo que se presenta a continuación se ha realizado un estudio de la regulación de los genes de nodulación de la estirpe HH103 de Rhizobium ...
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Exopolysaccharide Production by Sinorhizobium fredii HH103 Is Repressed by Genistein in a NodD1-Dependent Manner [Article]
(Public Library of Science, 2016)In the rhizobia-legume symbiotic interaction, bacterial surface polysaccharides, such as exopolysaccharide (EPS), lipopolysaccharide (LPS), K-antigen polysaccharide (KPS) or cyclic glucans (CG), appear to play crucial roles ...
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Hanks-Type Serine/Threonine Protein Kinases and Phosphatases in Bacteria: Roles in Signaling and Adaptation to Various Environments [Article]
(MDPI, 2018)Reversible phosphorylation is a key mechanism that regulates many cellular processes in prokaryotes and eukaryotes. In prokaryotes, signal transduction includes two-component signaling systems, which involve a membrane ...
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Inactivation of the "Sinorhizobium fredii" HH103 "rhcJ" gene abolishes nodulation outer proteins (Nops) secretion and decreases the symbiotic capacity with soybean [Article]
(Sociedad Española de Microbiología, Viguera Editores, 2006)Se ha propuesto que las proteínas externas de nodulación (Nops) impiden la nodulación efectiva de Sinorhizobium fredii USDA257 con las sojas americanas. S. fredii HH103 nodula de forma natural tanto conlas sojas asiáticas ...
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Mutation in the pssZ Gene Negatively Impacts Exopolysaccharide Synthesis, Surface Properties, and Symbiosis of Rhizobium leguminosarum bv. trifolii with Clover [Article]
(MDPI, 2018)Rhizobium leguminosarum bv. trifolii is a soil bacterium capable of establishing a nitrogen-fixing symbiosis with clover plants (Trifolium spp.). This bacterium secretes large amounts of acidic exopolysaccharide (EPS), ...
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NolR Regulates Diverse Symbiotic Signals of Sinorhizobium fredii HH103 [Article]
(The American Phytopathological Society, 2004)We have investigated in Sinorhizobium fredii HH103-1 (=HH103 Strr ) the influence of the nolR gene on the production of three different bacterial symbiotic signals: Nod factors, signal responsive (SR) proteins, and ...
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Regulación de la producción del Exopolisacárido en Sinorhizobium fredii HH103, un simbionte de la soja y otras leguminosas. [PhD Thesis]
(2017-09-28)Los rizobios son bacterias del suelo pertenecientes a las clases α- y β-Proteobacteria y que son capaces de llevar a cabo la fijación biológica del nitrógeno molecular en simbiosis con plantas leguminosas (Spaink et al., ...
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Regulation and symbiotic significance of nodulation outer proteins secretion in Sinorhizobium fredii HH103 [Article]
(2008)In this work we show that the Sinorhizobium fredii HH103 ttsI gene is essential for the expression of the tts genes and secretion of nodulation outer proteins (Nops). Moreover, we demonstrate for the first time, to our ...
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Regulation of Protein Secretion Systems Mediated by Cyclic Diguanylate in Plant-Interacting Bacteria [Article]
(Frontiers Research Foundation, 2019-06-12)The ubiquitous second messenger cyclic diguanylate (c-di-GMP) is involved in the regulation of different processes in bacteria. In phytopathogens, intracellular fluctuations in the concentration of this molecule contribute ...
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Regulatory elements located in the upstream region of the Rhizobium leguminosarum rosR global regulator are essential for its transcription and mRNA stability [Article]
(Multidisciplinary Digital Publishing Institute (MDPI), 2017)Rhizobium leguminosarum bv. trifolii is a soil bacterium capable of establishing a symbiotic relationship with clover (Trifolium spp.). Previously, the rosR gene, encoding a global regulatory protein involved in motility, ...
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Sinorhizobium fredii HH103 RirA is required for oxidative stress resistance and efficient symbiosis with Soybean [Article]
(MDPI, 2019-02-12)Members of Rhizobiaceae contain a homologue of the iron-responsive regulatory protein RirA. In different bacteria, RirA acts as a repressor of iron uptake systems under iron-replete conditions and contributes to ameliorate ...
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Sinorhizobium fredii Strains HH103 and NGR234 Form Nitrogen Fixing Nodules With Diverse Wild Soybeans (Glycine soja) From Central China but Are Ineffective on Northern China Accessions [Article]
(Frontiers Media, 2018)Sinorhizobium fredii indigenous populations are prevalent in provinces of Central China whereas Bradyrhizobium species (Bradyrhizobium japonicum, B. diazoefficiens, B. elkanii, and others) are more abundant in northern and ...
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Structure and biological roles of Sinorhizobium fredii HH103 exopolysaccharide [Article]
(Public Library of Science, 2014)Here we report that the structure of the Sinorhizobium fredii HH103 exopolysaccharide (EPS) is composed of glucose, galactose, glucuronic acid, pyruvic acid, in the ratios 5:2:2:1 and is partially acetylated. A S. fredii ...
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The rkpU gene of Sinorhizobium fredii HH103 is required for bacterial K-antigen polysaccharide production and for efficient nodulation with soybean but not with cowpea [Article]
(Society for General Microbiology, 2010)In this work, the role of the rkpU and rkpJ genes in the production of the K-antigen polysaccharides (KPS) and in the symbiotic capacity of Sinorhizobium fredii HH103, a broad host-range rhizobial strain able to nodulate ...