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  • 1
    Electronic Resource
    Electronic Resource
    Sexual swarms in Daphnia magna, a cyclic parthenogen (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 8 (1978), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. Dense swarms were observed in a population of Daphnia magna (Crustacea: Cladocera). The swarms appeared during a sexual period in which females were abundant but males were rare. Each swarm contained several males and large numbers of ‘imminently sexual’ females, a class of females that was rare except in the swarms. This implies that both sexes respond to attractant stimuli, and that the female response occurs only during a brief critical phase in the ovarian cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1978.tb01448.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Induction of root-mat symptoms on cucumber plants by Rhizobium, but not by Ochrobactrum or Sinorhizobium, harbouring a cucumopine Ri plasmid (2005)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 54 (2005), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Ochrobactrum CSL 2573, Rhizobium CSL 2411 and Sinorhizobium CSL 2611 strains harbouring the Agrobacterium cucumopine Ri plasmid (pRi), previously were shown to induce root-mat symptoms in an in vitro cucumber cotyledon assay. In whole-plant, rockwool-grown cucumber host tests Rhizobium CSL 2411 was shown to be as efficient an inducer of root-mat symptoms as the virulent Agrobacterium radiobacter strain NCPPB 4042, which also harbours a cucumopine pRi. Conjugal transfer of pRi to ingressing, avirulent Agrobacterium isolates was observed within root tissues with symptoms. Ochrobactrum CSL 2573 and Sinorhizobium CSL 2611 were not able to induce root-mat symptoms on plants. Rhizobium CSL 2411 and Ochrobactrum CSL 2573 were reisolated from inoculated plants, but Sinorhizobium CSL 2611 was not detected or isolated from inoculated plants 68 days after inoculation. It was postulated that the differences in pathogenicity observed between the in vitro and in situ host tests were caused by a lack of proper attachment to inoculated root tissues by pRi-harbouring Ochrobactrum and Sinorhizobium in the whole-plant host tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.2005.01283.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular diversity of arbuscular mycorrhizal fungi colonising arable crops (2001)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 36 (2001), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We used differences in small subunit ribosomal RNA genes to identify groups of arbuscular mycorrhizal fungi that are active in the colonisation of plant roots growing in arable fields around North Yorkshire, UK. Root samples were collected from four arable fields and four crop species, fungal sequences were amplified from individual plants by the polymerase chain reaction using primers NS31 and AM1. The products were cloned and 303 clones were classified by their restriction pattern with HinfI or RsaI; 72 were subsequently sequenced. Colonisation was dominated by Glomus species with a preponderance of only two sequence types, which are closely related. There is evidence for seasonal variation in colonisation in terms of both level of colonisation and sequence types present. Fungal diversity was much lower than that previously reported for a nearby woodland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.2001.tb00841.x
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  • 4
    Electronic Resource
    Electronic Resource
    Ploughing up the wood-wide web? (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 394 (1998), S. 431-431 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Key species groups that affect major ecological processes are vital components of community diversity. Many such key groups are found in the soil, including the mycorrhizal fungi that may connect plants into a functional “wood-wide web”. Arbuscular mycorrhizal associations are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/28764
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  • 5
    Electronic Resource
    Electronic Resource
    Phylogeny and taxonomy of rhizobia (1996)
    Springer
    Plant and soil 186 (1996), S. 45-52 
    Details
    ISSN: 1573-5036
    Keywords: Azorhizobium ; Bradyrhizobium ; Mesorhizobium ; phylogeny ; Rhizobium Sinorhizobium ; species ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Rhizobia are bacteria that form nitrogen-fixing nodules on the roots, or occasionally the shoots, of legumes. There are currently more than a dozen validly named species, but the true number of species is probably orders of magnitude higher. The named species are listed and briefly discussed. Sequences of the small subunit ribosomal RNA (SSU or 16S rRNA) support the well-established subdivision of rhizobia into three genera: Rhizobium, Bradyrhizobium, and Azorhizobium. These all lie within the alpha subdivision of the Proteobacteria, but on quite distinct branches, each of which also includes many bacterial species that are not rhizobia. It has been clear for several years that Rhizobium, on this definition, is still too broad and is polyphyletic: there are many non-rhizobia within this radiation. Recently, therefore, it has been suggested that this genus should be split into four genera, namely Rhizobium (R. leguminosarum, R. tropici, R. etli), Sinorhizobium (S. fredii, S. meliloti, S. teranga, S. saheli), Mesorhizobium (M. loti, M. huakuii, M ciceri, M. tianshanense, M. mediterraneum), and a fourth, unnamed, genus for the current R. galegae. The evidence and pros and cons are reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035054
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Rhizobium population genetics: Effect of clover variety and inoculum dilution on the genetic diversity sampled from natural populations (1987)
    Springer
    Plant and soil 103 (1987), S. 147-150 
    Details
    ISSN: 1573-5036
    Keywords: allozymes ; genetic diversity ; host preference ; Rhizobium leguminosarum biovartrifolii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Strains ofRhizobium leguminosarum biovartrifolii were isolated from nodules formed on white clover plants (Trifolium repens) following inoculation with soil suspensions, and examined for allozyme variation. A similar spectrum of genetic variants was recovered from each of four different clover cultivars, and over a 104-fold range of soil dilutions. The frequency of allozyme variants was not significantly affected by the choice of cultivar or dilution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370682
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    Paper (German National Licenses)
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