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  • Alnus glutinosa  (2)
  • Rhizobium  (2)
  • Agroinfection, virulence genes  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A 200 bp region of the pea ENOD12 promoter is sufficient for nodule-specific and Nod factor induced expression (1995)
    Springer
    Plant molecular biology 28 (1995), S. 1103-1110 
    Details
    ISSN: 1573-5028
    Keywords: ENOD12 ; gene regulation ; hairy roots ; Rhizobium ; transgenic root nodules ; Vicia hirsuta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract ENOD12 is one of the first nodulin genes expressed upon inoculation with Rhizobium and also purified Nod factors are able to induce ENOD12 expression. The ENOD12 gene family in pea (Pisum sativum) has two members. A cDNA clone representing PsENOD12A [26] and a PsENOD12B genomic clone [7] have been previously described. The isolation and characterization of a PsENOD12A genomic clone is presented in this paper. By using a Vicia hirsuta-Agrobacterium rhizogenes transformation system it is shown that both genes have a similar expression pattern in transgenic V. hirsuta root nodules. Promoter analyses of both PsENOD12 promoters showed that the 200 bp immediately upstream of the transcription start are sufficient to direct nodule-specific and Nod factor-induced gene expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032670
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  • 2
    Electronic Resource
    Electronic Resource
    Expression of Frankia nif genes in nodules of Alnus glutinosa (1995)
    Springer
    Plant and soil 170 (1995), S. 371-376 
    Details
    ISSN: 1573-5036
    Keywords: actinorhiza ; Alnus glutinosa ; Frankia ; in situ hybridization ; nifH ; nifW ; nifZ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Expression of Frankia genes involved in nitrogen fixation was studied in Alnus glutinosa nodules using the in situ hybridization technique. The results show that high level expression of nif genes does not occur immediately upon infection of cortical cells by Frankia. Also, only in the infected cells near the tips of the nodule lobes, nif genes are expressed at high levels. In the majority of infected cells, nif gene expression is rather low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010491
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  • 3
    Electronic Resource
    Electronic Resource
    VsENOD5, VsENOD12 and VsENOD40 expression during Rhizobium-induced nodule formation on Vicia sativa roots (1995)
    Springer
    Plant molecular biology 28 (1995), S. 1111-1119 
    Details
    ISSN: 1573-5028
    Keywords: early nodulins (ENOD) ; Rhizobium ; root nodule development ; Vicia sativa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We isolated ENOD5, ENOD12 and ENOD40 homologues from Vicia sativa and studied their expression pattern during Rhizobium-induced nodule formation. Comparison of the VsENOD40 nucleotide sequence with the pea, soybean and alfalfa ENOD40 sequences showed that the sequences contain two conserved regions, called region I and region II. Comparison of all the potential open reading frames (ORFs) showed that all the five different ENOD40 clones encode a highly conserved small polypeptide of 12 or 13 amino acids encoded by an ORF located in region I. Furthermore we studied with in situ hybridization the expression pattern of VsENOD5, VsENOD12 and VsENOD40 during Rhizobium-induced nodule formation. Although the expression of these genes is largely similar to that of the pea counterparts, differences where found for the expression of VsENOD12 and VsENOD40 in Vicia. VsENOD12 is expressed in the whole prefixation zone II, whereas in pea ENOD12 is only expressed in the distal part of this zone. VsENOD40 is expressed in the uninfected cells of interzone II–III; while in pea ENOD40 is expressed in both the uninfected and infected cells of this zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032671
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  • 4
    Electronic Resource
    Electronic Resource
    Nitrogen metabolism in actinorhizal nodules of Alnus glutinosa: expression of glutamine synthetase and acetylornithine transaminase (1996)
    Springer
    Plant molecular biology 32 (1996), S. 1177-1184 
    Details
    ISSN: 1573-5028
    Keywords: actinorhiza ; nodules ; Alnus glutinosa ; symbiotic nitrogen fixation ; nitrogen metabolism ; glutamine synthetase ; acetylornithine transaminase ; in situ hybridization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two nodule cDNA clones representing genes involved in Alnus glutinosa nitrogen metabolism were analysed. ag11 encoded glutamine synthetase (GS), the enzyme responsible for ammonium assimilation, while ag118 encoded acetylornithine transaminase (AOTA), an enzyme involved in the biosynthesis of citrulline, the nitrogen transport form in Alnus. GS mRNA was found at highest levels in root nodules, where it was present in the infected cells as well as in the cells of the pericycle of the vascular system. AOTA transcripts were found at high levels in nodules, confined to the infected cells, suggesting that in nodules of A. glutinosa, citrulline biosynthesis takes place mainly in the infected cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041403
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  • 5
    Electronic Resource
    Electronic Resource
    Detection of T-DNA transfer to plant cells by A. tumefaciens virulence mutants using agroinfection (1986)
    Springer
    Molecular genetics and genomics 205 (1986), S. 411-416 
    Details
    ISSN: 1617-4623
    Keywords: A. tumefaciens ; Agroinfection, virulence genes ; T-DNA transfer ; Cauliflower mosaic virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary To test whether virulence mutants of Agrobacterium tumefaciens are capable of promoting T-DNA transfer into plant cells, a tandem array of Cauliflower Mosaic Virus (CaMV) DNA was cloned between T-region border sequences on a wide host range plasmid and introduced into various virulence mutants. The resulting strains were used to infect Brassica rapa cv. Just Right. This assay, recently referred to as agroinfection, is based on the appearance of viral symptoms following transfer of T-DNA to plant cells, and is shown to be at least 100 times more sensitive in detecting T-DNA transfer than tumour formation. Mutants in the loci vir A, B and G, which were avirulent on turnip, failed to induce virus symptoms. Of the two vir D mutants tested, neither induced tumours, but one was capable of inducing virus symptoms. Mutants in vir E, C and F, which induced respectively no, small and normal tumours on turnip, all induced virus symptoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338075
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