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  • 1
    Electronic Resource
    Electronic Resource
    Rhizobial siderophore as an iron source for clover (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 85 (1992), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Iron uptake by clover plants (Trifoliuin pratense L. cv. Hruszowska) was studied using radioactive ferric iron (55FeCl2). As shown by autoradiography of non-infected plants, purified rhizobial siderophore isolated from Rhizobium leguminosarum by, trifolii, stimulated the uptake and shoot transport of iron. Addition of rhizobial siderophore into the growth medium of nodulated clover did not affect the iron transport to the shoots. In the absence of the rhizobial siderophore, clover infected by either nitrogen-fixing (Nod− Fix+) or nonfixing (Nod+ Fix−) R. L. trifolii strains took up and transported into the shoots more iron than the non-infected control plants. Nodulated clover reduced Fe(III) more efficiently than the non-infected control plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1992.tb05825.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Transfer of the demethylation and decarboxylation activity of vanillic acid to Klebsiella (1982)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 13 (1982), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1982.tb08299.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Siderophore production and utilization byRhizobium trifolii (1989)
    Springer
    BioMetals 2 (1989), S. 45-49 
    Details
    ISSN: 1572-8773
    Keywords: Siderophore production ; Siderophore utilization ; Rhizobium trifolii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Several strains ofRhizobium trifolii were tested for their ability to synthesize and utilize phenolate or hydroxamate types of siderophores. None of the nodulating strains ofR. trifolii was able to produce detectable amounts of siderophores. Only the non-nodulating strainR. trifolii AR6 formed a phenolate siderophore, which stimulated the growth of the siderophore-negative mutant AR65. Other strains ofR. trifolii could not utilize iron from exogenously supplied Desferal, pseudobactin or citrate. The siderophore fromR. trifolii AR6 and 2,3-dihydroxybenzoic acid slightly stimulated the growth of someR. trifolii strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01116201
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Detection of small cryptic plasmids in Salmonella typhimurium strain LT2 (1978)
    Springer
    Archives of microbiology 119 (1978), S. 87-90 
    Details
    ISSN: 1432-072X
    Keywords: Salmonella typhimurium strain LT2 (ColIb) ; Cryptic plasmids ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Small cryptic plasmids of molecular weights ranging from 1 to 3 Mdal were detected by electron microscopy in Salmonella typhimurium strain LT2 (ColIb). They were divided into different size classes. Two of the cryptic plasmids were transferred simultaneously with ColIb to Escherichia coli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00407933
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  • 5
    Electronic Resource
    Electronic Resource
    Nif plasmid from Lignobacter (1981)
    Springer
    Archives of microbiology 130 (1981), S. 322-324 
    Details
    ISSN: 1432-072X
    Keywords: Lignobacter ; Salmonella typhimurium ; Escherichia coli ; Nif plasmid ; Tn9 ; Transduction ; Transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lignobacter strain K17 is able to degrade aromatic compounds and to fix atmospheric nitrogen. It was proved that capacity for nitrogen fixation by Lignobacter was plasmid mediated. Plasmid pUCS100 (17.5 Mdal) carrying nif genes was transferred from Lignobacter to Escherichia coli SK1592 and Salmonella typhimurium. The transposon Tn9 was translocated to pUCS100 to facilitate selection of Nif+ bacteria. E. coli SK1592 harboring the new plasmid (pUCS101) reduced acetylene under anaerobic conditions. Plasmids pUCS100 and pUCS101 were not stably maintained in E. coli and S. typhimurium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425948
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  • 6
    Electronic Resource
    Electronic Resource
    Role of noncarbohydrate substitutions of Rhizobium exopolysaccharide in nodulation process (1985)
    Springer
    Archives of microbiology 143 (1985), S. 307-310 
    Details
    ISSN: 1432-072X
    Keywords: Exopolysaccharides ; Nodulation ; Rhizobium trifolii ; O-acetyl groups ; Pyruvic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Exopolysaccharides (EPS) of nodulating strains of Rhizobium trifolii and Rhizobium leguminosarum added to red clover seedlings before inoculation reduced the number of nodules. The inhibition of the nodulation was correlated with the amount of EPS. The preparations of EPS from mutants defective in early stages of nodulation (Roa- or Hac-) did not affect the nodulation, whereas EPS from mutants deficient in late stages (post Hac-) exerted an inhibitory effect. Inactive preparation of EPS contained less O-acetyl groups and pyruvic acid residues. Deacetylation and depyruvylation of EPS from R. trifolii Nod+ abolished it inhibitory effect. It was concluded that noncarbohydrate substitutions (acetate, pyruvate) are involved in EPS effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411255
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  • 7
    Electronic Resource
    Electronic Resource
    Plasmid-determined alterations of Salmonella typhimurium lipopolysaccharides (1975)
    Springer
    Molecular genetics and genomics 140 (1975), S. 175-181 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Salmonella typhimurium Rc902 infected with derepressed ColIb mutants gave rise to changes in the composition of bacterial lipopolysaccharides (LPS). Bacteria carrying ColIbdrd7, derepressed in transfer, exhibited a marked decrease in the content of all 0-side-chain sugars of LPS. Similar effects were found upon the introduction of R64-11, also derepressed in transfer. In LPS of S. typhimurium containing ColIbdrd2, derepressed in colicin synthesis, a decrease of abequose content associated with an increase of glucose level was observed. Bacteria carrying the wild-type ColIb, the revertant of a drd mutant to the wild type, or the non colicinogenic strain resulting from the elimination of ColIbdrd2, showed no changes in the sugar composition of LPS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329785
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  • 8
    Electronic Resource
    Electronic Resource
    Enhancement of symbiotic nitrogen fixation by vitamin-secreting fluorescent Pseudomonas (1993)
    Springer
    Plant and soil 154 (1993), S. 211-217 
    Details
    ISSN: 1573-5036
    Keywords: nitrogen fixation ; plant growth promotion ; Pseudomonas sp. ; Rhizobium leguminosarum ; vitamins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Fluorescent Pseudomonas sp. strain 267 promotes growth of nodulated clover plants under gnotobiotic conditions. In the growth conditions (60 μM FeCl3), the production of siderophores of the pseudobactin-pyoverdin group was repressed. Plant growth enhancement results from secretion of B vitamins by Pseudomonas sp. strain 267. This was proven by stimulation of clover growth by naturally auxotrophic strains of Rhizobium leguminosarum bv. trifolii and marker strains E. coli thi- and R. meliloti pan- in the presence of the supernatant of Pseudomonas sp. strain 267. The addition of vitamins to the plant medium increased symbiotic nitrogen fixation by the clover plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012526
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