The laboratory experiments tested the influence of selected pesticides on the symbiotic efficiency and nitrogenase activity of Rhizobium leguminosarumin bv. trifolii KGL, Sinorhizobiuni melilotii Bp and Badyrhizobium sp. Ornithopus B bacteria entering into symbiosis with clover, lucerne and serradella, respectively. The results obtained indicate that the pesticides used in the experiments (Funa...

The repABC replicons have an unusual structure, since they carry genes coding for partitioning (repA, repB) and replication (repC) proteins, which are organized in an operon. So far, the presence of these compact bi-functional modules has been reported only in the megaplasmids of the Rhizobiaceae and within the plasmid pTAV1 (107kb) of Paracoccus versutus. We studied the distribution of repABC-...

The host range of an octopine Ti plasmid is limited to Rhizobiaceae. This has been extended also to Escherichia coli in the form of a stable cointegrate with the wide-host-range plasmid R772. Its structure was studied by constructing a physical map of R772 and of the R772::pTiB6 cointegrate. An insertion sequence present in R772, called IS70, turned out to be involved in cointegrate formation. ...

Rhizobium meliloti strain SU47 produces the calcofluor-binding exopolysaccharide, succinoglycan, that is required for alfalfa root nodule invasion. Strains derived from R. meliloti SU47 secreted an acidic exopolysaccharide, EPSb, that replaced succinoglycan in nodule invasion. EPSb, which has not formerly been identified among the Rhizobiaceae, consisted of the repeating unit 4,6-O-(1-carboxyet...

Mattia Walschaers,1, 2, ∗ Andreas Buchleitner,1 and Mark Fannes2 1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg, Germany 2Instituut voor Theoretische Fysica, KU Leuven, Celestijnenlaan 200D, B-3001 Heverlee, Belgium (Dated: June 10, 2016) Abstract We study particle currents for indistinguishable particles driven far from equilibrium. Our g...

The microbial communities inhabiting the root interior of healthy plants, as well as the rhizosphere, which consists of soil particles firmly attached to roots, engage in symbiotic associations with their host. To investigate the structural and functional diversification among these communities, we employed a combination of 16S rRNA gene profiling and shotgun metagenome analysis of the microbio...

Recently one of the writers (Conn, 1938) proposed the name Rhizobiaceae for a family containing the genera Rhizobium, Alcaligenes, and Chromobacterium, together with certain species commonly placed today in the genus Phytomona8. This suggestion has been followed in the 5th edition of Bergey's Manual of Determinative Bacteriology. Inasmuch as the writer's paper above mentioned was published only...

Although several commensal alphaproteobacteria form close relationships with plant hosts where they aid in (e.g.,) nitrogen fixation and nodulation, only a few inhabit animal hosts. Among these, Reichenowia picta, R. ornata and R. parasitica, are currently the only known mutualistic, alphaproteobacterial endosymbionts to inhabit leeches. These bacteria are harbored in the epithelial cells of th...

A broad-host-range plasmid containing a fusion of the alkA and lacZ genes of Escherichia coli was introduced into various aerobic and facultative gram-negative bacteria--33 species belonging to 19 genera--to study the induction of expression of the alkA gene by alkylating agents. The bacteria included species of the families Enterobacteriaceae, Pseudomonadaceae, Rhizobiaceae, Vibrionaceae, Neis...