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  • Electronic Resource  (3)
  • Host range  (2)
  • Cyanobacteria  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Influence ofRhizobium leguminosarum biovartrifolii host specific nodulation genes on the ontogeny of clover nodulation (1993)
    Springer
    Protoplasma 172 (1993), S. 166-179 
    Details
    ISSN: 1615-6102
    Keywords: Host range ; Rhizobium nodulation ; Nodule development ; Cortical cell division
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The infection of white clover seedlings byRhizobium strains with different host range properties was assessed using various microscopic techniques. Several wild-type andRhizobium leguminosarum biovarvicias hybrid strains containing definedR. l. bv.trifolii host range genes were used. The morphological changes in the root tissue of uninoculated and rhizobia inoculated white clovers were identified and compared. In particular, changes were observed in the induction of inner cortical cell division, alterations to nodule development and lateral root formation. The responses of the infected roots and the types of structures formed support the hypothesis that lateral roots and nodules may be physiologically homologous structures. To establish a normal pattern of nodulation on white clover roots, both sets of known host specific nodulation genes (operonsnod FERL andnod MNX) ofR. l. bv.trifolii were required. However, some nodule development occurred when only thenod FERL genes were present in the hybrid strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379374
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Taxonomic status ofAnabaena azollae: An overview (1988)
    Springer
    Plant and soil 108 (1988), S. 185-190 
    Details
    ISSN: 1573-5036
    Keywords: Anabaena azollae ; Azolla ; Cyanobacteria ; DNA/DNA hybridization ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Despite the long-standing and widespread use of the symbiotic association between the aquatic fern Azolla and its cyanobacterial symbiontAnabaena azollae to augment nitrogen supplies in rice paddy soils, very little is known about taxonomic aspects of the symbiosis. The two partners normally remain associated throughout vegetative and reproductive development, limiting the opportunities for interchanges. We have used monoclonal antibodies and DNA/DNA hybridization techniques to show that the cyanobacterial partner is not uniform throughout the genus Azolla, and that substantial diversification has occurred. With these procedures it will be possible to characterize genotypes of the cyanobacterium and to monitor experiments aimed at synthesizing new combinations ofAzolla species andAnabaena azollae strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370114
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of the host range of fast-growingR. japonicum strains with a fast-growing isolate from Lablab (1986)
    Springer
    Plant and soil 92 (1986), S. 313-317 
    Details
    ISSN: 1573-5036
    Keywords: Fast-growingGlycine max ; Host range ; Lablab ; Nodulation ; Rhizobium japonicum ; Slow-growing ; Tropical legumes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Fast-growingRhizobium japnicum strains derived from the People's Republic of China were compared with a fast-growingRhizobium isolate from Lablab for their ability to nodulate tropical legumes grown in Leonard-jars and test tube culture. Fast-growingR. japonicum strains were all effective to varying degrees in their symbiosis withVigna unguiculata. Two strains USDA 192 and USDA 201, effectively nodulatedGlycine whightii and one strain, USDA 193, effectively nodulatedMacroptilium atropurpureum. Other nodulation responses in tropical legumes were ineffective. The fast-growing isolate from Lablab was more promiscuous, effectively nodulating with a larger host range. The fast-growing Lablab strain was considered more akin, on a symbiotic basis, to the slow-growing cowpea type rhizobia than the fast-growing China strains ofR. japonicum whilst maintaining physiological characteristics of other fast-growing rhizobia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372646
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    Paper (German National Licenses)
    Fulltext
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