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  1. IPB Halle
  2. Research
  3. Publications

    • Research Mission and Profile
    • Trenner 0
    • Molecular Signal Processing
      • Secretariat & All Staff
      • Technical Resources
      • Publications
      • Research Groups
        • Nutrient Sensing
        • Symbiosis Signaling
        • Jasmonate Signaling
    • Bioorganic Chemistry
      • Secretariat & All Staff
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      • Publications
      • Research Groups
        • Bioactives
        • Natural Products & Metabolomics
        • Biotechnology
        • Biofunctional Synthesis
        • Computational Chemistry
        • Data & Resources
    • Biochemistry of Plant Interactions
      • Secretariat & All Staff
      • Technical Resources
      • Publications
      • Research Groups
        • Calcium-dependent Protein Kinases
        • Cellular Signaling
        • Metabolite-based Defense Mechanisms
        • Nuclear Processes in Plant Defense
    • Cell and Metabolic Biology
      • Secretariat & All Staff
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        • Glandular Trichomes and Isoprenoid Biosynthesis
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    • Publications
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    • Alumni Research Groups
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        • Auxin Signaling
        • Bioorganic Chemistry
        • Designer Glycans
        • Jasmonate Mode of Action
        • Protein Recognition and Degradation
        • Regulatory RNAs (MLU-associated group)
        • Signal Integration
        • Ubiquitination in Immunity
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Mugford, S. G.; Yoshimoto, N.; Reichelt, M.; Wirtz, M.; Hill, L.; Mugford, S. T.; Nakazato, Y.; Noji, M.; Takahashi, H.; Kramell, R.; Gigolashvili, T.; Flügge, U.-I.; Wasternack, C.; Gershenzon, J.; Hell, R.; Saito, K.; Kopriva, S.; Disruption of Adenosine-5′-Phosphosulfate Kinase in Arabidopsis Reduces Levels of Sulfated Secondary Metabolites Plant Cell 21 910-927 (2009) DOI: 10.1105/tpc.109.065581
  • Abstract
  • BibText
  • RIS

Plants can metabolize sulfate by two pathways, which branch at the level of adenosine 5′-phosphosulfate (APS). APS can be reduced to sulfide and incorporated into Cys in the primary sulfate assimilation pathway or phosphorylated by APS kinase to 3′-phosphoadenosine 5′-phosphosulfate, which is the activated sulfate form for sulfation reactions. To assess to what extent APS kinase regulates accumulation of sulfated compounds, we analyzed the corresponding gene family in Arabidopsis thaliana. Analysis of T-DNA insertion knockout lines for each of the four isoforms did not reveal any phenotypical alterations. However, when all six combinations of double mutants were compared, the apk1 apk2 plants were significantly smaller than wild-type plants. The levels of glucosinolates, a major class of sulfated secondary metabolites, and the sulfated 12-hydroxyjasmonate were reduced approximately fivefold in apk1 apk2 plants. Although auxin levels were increased in the apk1 apk2 mutants, as is the case for most plants with compromised glucosinolate synthesis, typical high auxin phenotypes were not observed. The reduction in glucosinolates resulted in increased transcript levels for genes involved in glucosinolate biosynthesis and accumulation of desulfated precursors. It also led to great alterations in sulfur metabolism: the levels of sulfate and thiols increased in the apk1 apk2 plants. The data indicate that the APK1 and APK2 isoforms of APS kinase play a major role in the synthesis of secondary sulfated metabolites and are required for normal growth rates.

Publications

Lee, C.-W.; Efetova, M.; Engelmann, J. C.; Kramell, R.; Wasternack, C.; Ludwig-Müller, J.; Hedrich, R.; Deeken, R.; Agrobacterium tumefaciens Promotes Tumor Induction by Modulating Pathogen Defense in Arabidopsis thaliana Plant Cell 21 2948-2962 (2009) DOI: 10.1105/tpc.108.064576
  • Abstract
  • BibText
  • RIS

Agrobacterium tumefaciens causes crown gall disease by transferring and integrating bacterial DNA (T-DNA) into the plant genome. To examine the physiological changes and adaptations during Agrobacterium-induced tumor development, we compared the profiles of salicylic acid (SA), ethylene (ET), jasmonic acid (JA), and auxin (indole-3-acetic acid [IAA]) with changes in the Arabidopsis thaliana transcriptome. Our data indicate that host responses were much stronger toward the oncogenic strain C58 than to the disarmed strain GV3101 and that auxin acts as a key modulator of the Arabidopsis–Agrobacterium interaction. At initiation of infection, elevated levels of IAA and ET were associated with the induction of host genes involved in IAA, but not ET signaling. After T-DNA integration, SA as well as IAA and ET accumulated, but JA did not. This did not correlate with SA-controlled pathogenesis-related gene expression in the host, although high SA levels in mutant plants prevented tumor development, while low levels promoted it. Our data are consistent with a scenario in which ET and later on SA control virulence of agrobacteria, whereas ET and auxin stimulate neovascularization during tumor formation. We suggest that crosstalk among IAA, ET, and SA balances pathogen defense launched by the host and tumor growth initiated by agrobacteria.

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