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Showing 1 to 20 of 30 for “"Sinorhizobium"”.
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Characterization of symbiotically important processes in Sinorhizobium meliloti
… models of BNF is the symbiotic association of Sinorhizobium meliloti - Medicago sativa (alfalfa). Since alfalfa is a major source of animal feed and the fourth largest crop grown in the USA, enhanced understanding of this symbiosis can have implications for increasing crop yields, reducing …
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Studies of bacterial homeostasis Sinorhizobium meliloti and Escherichia coli
The symbiosis between Sinorhizobium meliloti and its plant host Medicago sativa, offers a tractable model to explore the bacterial requirements for endocytic survival in a eukaryotic host. It has been shown that during development of this symbiosis, M. sativa releases an oxidative burst that S. …
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Quantification and functional characterization of Sinorhizobium meliloti chemotaxis proteins
The flagellated soil-dwelling bacterium Sinorhizobium meliloti is known for its symbiotic relationship with several leguminous genera. The symbiosis between the bacterium and its host plants facilitates fixation of atmospheric nitrogen and ultimately replenishment of nitrogen to the soil. However, …
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Studies on the role of CheS in Sinorhizobium meliloti chemotaxis
… a phosphatase; certain organisms, such as <i>Sinorhizobium meliloti</i>, that lack a CheZ homolog have developed alternate methods of signal termination. The signaling chain of S. meliloti contains two response regulators, CheY1 and CheY2, in which CheY2 modulates flagellar rotation and CheY1 …
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Similarities and variations of the enterobacterial chemotaxis paradigm in Sinorhizobium meliloti
Sinorhizobium meliloti is a nitrogen-fixing endosymbiont of the legume Medicago sativa commonly known as alfalfa. It uses flagellar rotation and chemotaxis to seek roots of host plants to inhabit. This symbiosis serves as a great model system for studying biological nitrogen fixation and …
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Haem and xenosiderophore mediated iron acquisition by sinorhizobium meliloti and pseudomonas aeruginosa
… evolved several mechanisms of iron acquisition. Sinorhizobium meliloti 2011, the endosymbiont of Medicago sativa, is capable of utilising several xenosiderophores and the haem compounds haemoglobin and haemin to overcome conditions of iron limitation. The high demand for iron in the nodule makes …
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Molekulare Analyse des Biotin-regulatorischen Netzwerks Sinorhizobium meliloti durch Proteomanalyse, Expressionsstudien und Mutagenesen
Bakterien der Gattung Sinorhizobium meliloti sind nicht in der Lage Biotin selbst zu synthetisieren. Daher führt Biotinlimitierung zu einer deutlichen Reduktion von Stoffwechselaktivitäten, wohingegen Biotinsuffizienz einen allgemein positiven Einfluß auf Wachstum und Proteinbiosynthese nimmt. Ziel …
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The nature of host plant recruitment by the sensory repertoire of Sinorhizobium meliloti
Sinorhizobium meliloti (Ensifer meliloti) is a bacterium that will exist saprotrophically in the soil and rhizosphere or as a differentiated bacteroid inside root nodules of the legume genera Medicago, Melilotus, and Trigonella. It exists in symbiosis when inside a host plant and will fix gaseous …
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The development of Sinorhizobium meliloti and Deinococcus radiodurans as chassis for synthetic biology applications
… include the nitrogen-fixing plant symbiont, Sinorhizobium meliloti, and the polyextremophile, Deinococcus radiodurans. While some progress has been made toward the development of these chassis, further strain and tool developments are required to unlock their full potential. Here, I present …
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Identification of genes in Sinorhizobium meliloti relevant to symbiosis and competitiveness using signature tagged transposons
Sinorhizobium meliloti is a model organism for studies of plant-microbe interactions. This Gram-negative soil bacterium can enter an endosymbiosis with alfalfa plants through the formation of nitrogen-fixing nodules. S. meliloti genome sequence determination has provided a basis for different …
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Genetic and biochemical analyses of succinoglycan, EPS II, and K antigen, polysaccharides important in the Sinorhizobium meliloti-alfalfa symbiosis
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Biology, 2001.
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Roles and Interplay of Flavonoids, Reactive Oxygen Species, and Cytokinin in the Early Infection of Medicago truncatula by Sinorhizobium meliloti
Understanding the mechanisms by which legumes are infected by symbiotic, nitrogen-fixing bacteria (rhizobia) may prove crucial in the pursuit of bio-engineering nitrogen-fixation in current food crops, and as a result, reducing reliance on nitrogen fertilisers. In this thesis, I have examined the …
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The little engine that could: Characterization of noncanonical components in the speed-variable flagellar motor of the symbiotic soil bacterium Sinorhizobium meliloti
… Additionally, the soil-dwelling bacterium Sinorhizobium meliloti exhibits marked distinctions in the regulation, structure, and function of its navigation systems. S. meliloti is a nitrogen-fixing symbiont of the agronomically valuable leguminous plant, Medicago sativa Lucerne, and uses its …
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Global analysis of the transcriptional regulation of Sinorhizobium meliloti cell cycle progression and study of cell cycle regulation during symbiosis with Medicago sativa
… The soil-dwelling [alpha]-proteobacterium, Sinorhizobium meliloti, not only has to accurately coordinate the replication of its tripartite genome, but also must undergo a dramatic cellular differentiation in order to form an effective symbiosis with the legume Medicago sativa. Preliminary …
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An assessment of rhizobial infection, metabolite release and growth response in agriculturally important legume and cereal crops
… GHR2, Bradyrhizobium japonicum Tal 110, Sinorhizobium meliloti strain 1, Rhizobium leguminosarum bv. viceae Cn6, R. leguminosarum bv. viceae strain 30, Rhizobium NGR234 and Azorhizobium caulinodans ORSS71, hereafter referred to as ""rhizobia"") that fix N2, were used to study rhizobial …
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Auxin and the nodule
… truncatula with its symbiotic rhizobium, Sinorhizobium meliloti. Using a variety of approaches, we uncover the role of local auxin biosynthesis in the initiation of the indeterminate nodule, and indicate how local auxin biosynthesis is necessary and sufficient for lateral organ induction …
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Dissecting the NCR Peptide Landscape in the R108 Ecotype in Medicago Truncatula and the Search for the NF21325 Symbiotic Mutant
… correlations and strain-specific responses with Sinorhizobium meliloti suggest a partial loss-of-function or complex genetic redundancy. To address R108’s limited genomic characterization, a bioinformatics pipeline identified novel NCR homologs and expanded the canonical NCR definition by …
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Gene Expression Profiling of the nip Mutant in Medicago truncatula
… with polyphenolics) becomes infected by Sinorhizobium meliloti but then accumulates polyphenolic defense compounds in the nodule and fails to progress to a stage where nitrogen fixation can occur. Analysis of the transcriptome of nip roots prior to inoculation with rhizobia was undertaken …
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The Effects Of Clinorotation In The Host Plant, Medicago Truncatula, And Its Microbial Symbionts
… relationship among Medicago truncatula–Sinorhizobium meliloti–Rhizophagus irregularis. Plants were inoculated with rhizobial bacteria (S. meliloti), arbuscular mycorrhizal fungi (R. irregularis), both microbes, or none (microbial control), and placed on a rotating clinostat for 28 d. …
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Umwelt-Genomik als Quelle für die Isolierung von neuen Operons und Genclustern aus mikrobiellen Konsortien
… wurden dabei Corynebacterium glutamicum, Sinorhizobium meliloti, Rhizobium NGR234, Rhizobium etli, Ralstonia eutropha, Agrobacterium tumeafciens, Klebsiella planticola, Escherichia coli und Xanthomonas campestris gewählt. Interessanterweise, nur E. coli-Stämme die das bio-Operon aus dem …
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