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  • 1
    Electronic Resource
    Electronic Resource
    A cDNA from the arbuscular mycorrhizal fungus Glomus versiforme with homology to a cruciform DNA-binding protein from Ustilago maydis (1998)
    Springer
    Mycorrhiza 7 (1998), S. 301-306 
    Details
    ISSN: 1432-1890
    Keywords: Key words Arbuscular mycorrhiza ; Differential screening ; Gv1 ; HMP1 ; Roots
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A cDNA clone (Gv1) was isolated from a Medicago truncatula/Glomus versiforme root cDNA library by a differential screening technique. Gv1 represents a full-length G. versiforme mRNA encoding a 99-amino-acid polypeptide. This shares regions of identity with HMP1, a non-histone, cruciform DNA-binding protein from Ustilago maydis. Northern blot analysis indicated that Gv1 transcripts were present in mycorrhizal roots of M. truncatula and M. sativa (alfalfa), but absent in uncolonized roots of both species. A reverse transcription/polymerase chain reaction (RT-PCR) technique detected transcripts in the roots of the M. sativa non-mycorrhizal genotype MN NN-1008 colonized with G. versiforme, as well as in external hyphae collected from the roots of M. sativa colonized with G. versiforme. A genomic copy of Gv1 was detected by PCR in DNA isolated from the roots of M. truncatula colonized with G. versiforme and in DNA isolated from spores of G. versiforme. The PCR product identified in the mycorrhizal DNA preparation was identical in sequence to the cDNA, except for the presence of two introns. A homologue of Gv1 was detected in a second arbuscular mycorrhizal fungus, Glomus intraradices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005720050196
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  • 2
    Electronic Resource
    Electronic Resource
    A novel gene whose expression in Medicago truncatula roots is suppressed in response to colonization by vesicular-arbuscular mycorrhizal (VAM) fungi and to phosphate nutrition (1997)
    Springer
    Plant molecular biology 34 (1997), S. 199-208 
    Details
    ISSN: 1573-5028
    Keywords: Medicago truncatula ; vesicular arbuscular mycorrhizal symbiosis ; phosphate ; differential gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A cDNA clone (Mt4) was isolated as a result of a differential screen to identify genes showing altered expression during the interaction between Medicago truncatula and the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus versiforme. Mt4 represents a M. truncatula mRNA that contains numerous short open reading frames, the two longest of which are predicted to encode polypeptides of 51 amino acids each. One of these open reading frames shares a short region of identity with a phosphate starvation-inducible gene from tomato. Mt4 gene expression is regulated in response to colonization by mycorrhizal fungi: transcripts were detected in non-colonized roots and levels decreased in both M. truncatula and M. sativa (alfalfa) roots after colonization by G. versiforme. Transcript levels also decreased during the incomplete interaction between G. versiforme and a M. sativa mycorrhizal minus (myc-) line, indicating that the down-regulation of this gene occurs early during the interaction between the fungus and its host plant. Phosphate levels in the nutrient media also affected the expression of the Mt4 gene: transcripts were present in the roots of plants grown under phosphate-deficient conditions, but were undetectable in the roots of plants grown under phosphate sufficient conditions. Furthermore, expression was only observed when plants were grown under nitrogen-sufficient conditions. Northern blot analyses indicate that Mt4 transcripts are present primarily in roots and barely detectable in stems or leaves. Thus, Mt4 represents a M. truncatula gene whose expression is regulated in response to both colonization by mycorrhizal fungi and to the phosphate status of the plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005841119665
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  • 3
    Electronic Resource
    Electronic Resource
    Occurrence of Myrica-nodulating Frankia in Hawaiian volcanic soils (1994)
    Springer
    Plant and soil 164 (1994), S. 283-289 
    Details
    ISSN: 1573-5036
    Keywords: Actinomycete ; actinorhizae ; Frankia ; Myrica ; nodulation ; volcanic soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The ability of Hawaiian volcanic soils to nodulate actinorhizal Myrica cerifera, Casuarina equisetifolia, and Alnus glutinosa was determined using a host-plant bioassay. Myrica-nodulating Frankia occurred in five volcanic deposits with depositional ages ranging from 20 to 162 years before present. The oldest deposit had a mean estimated nodulation capacity from 450 to 1200 times greater than those of the younger deposits. Only the oldest deposit had high moisture content, high organic matter content, and increased vegetative cover, including an abundance of actinorhizal M. faya. Casuarina- and Alnus-nodulating Frankia were not detected in any of these volcanic deposits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010080
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    Paper (German National Licenses)
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