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@PHDTHESIS{Klug:46951,
      author       = {Klug, Katharina},
      title        = {{S}ystemic effects of mycorrhization on root and shoot
                      physiology of $\textit{{L}ycopersicon esculentum}$},
      volume       = {69},
      school       = {Universität Düsseldorf},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-46951},
      isbn         = {3-89336-463-3},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Umwelt /
                      Environment},
      pages        = {IV, 105 S.},
      year         = {2006},
      note         = {Record converted from JUWEL: 18.07.2013; Universität
                      Düsseldorf, Diss., 2006},
      abstract     = {In a splitroot system, the influence of mycorrhization of
                      tomato plants with the vesiculararbuscular mycorrhizal
                      fungus $\textit{Glomus intraradices}$ on physiology and
                      shikimate pathway transcription was investigated to
                      distinguish between local effects in the mycorrhizal roots
                      and systemic effects in the shoot and in the non-mycorrhizal
                      part of a half-mycorrhizal root. Mycorrhization caused a
                      growth depression and reduced concentrations of elemental
                      carbon and carbohydrates in mycorrhizal and half mycorrhizal
                      roots compared to controls. The two parts of the half
                      mycorrhizal root showed the same low carbon concentration,
                      indicating a systemic effect on carbon availability in the
                      root and the great sink strength of the fungus. Despite, in
                      a developed symbiosis the elevated nitrogen concentration in
                      shoots and roots of mycorrhizal plants, with higher
                      concentrations in the mycorrhizal part of the half
                      mycorrhizal roots, indicated a better supply of mycorrhizal
                      roots and shoots with nutrients, on the cost of nitrogen
                      supply of the non-mycorrhizal part of the root. Although
                      increased nitrogen levels could lead to increased amino acid
                      synthesis, the biosynthesis pathway for the three aromatic
                      amino acids, the shikimate pathway, was not regulated in
                      this later stage of the symbiosis. However, elevated
                      shikimate pathway transcripts in mycorrhizal roots in the
                      early stage of the symbiosis were demonstrated for the first
                      time. This indicates an involvement of the shikimate pathway
                      in early defence responses against the fungus and an
                      influence of changes in carbon status and sugar metabolism
                      on the pathway. A more detailed look to the entry enzyme of
                      the shikimate pathway in plants revealed that one of its two
                      isoforms (DAHPS2) was upregulated by mycorrhization. This
                      one was also induced by short-term ozone exposure, whereas
                      the other was unaffected under the investigated conditions.
                      Furthermore, an influence of mycorrhization on the shoot
                      reaction to ozone was found. Dependent on the mycorrhization
                      rate, an additional treatment with ozone caused additive
                      DAHPS induction of the second isoform in shoots. VOC
                      emissions and glutathione concentrations were only elevated
                      in shoots of non-mycorrhizal plants after ozone exposure,
                      indicating changes in root-shoot interactions involving
                      signalling cascades. Neither early jasmonic acid or hexenal
                      induction nor later methyl-salicylate emissions seem to be
                      relevant in the regulation of DAHPS in response to ozone.
                      Moreover, ozone alone did not only induce the shikimate
                      pathway in shoots, but there was also an isoform specific
                      induction of DAHPS transcripts in roots after ozone
                      treatment, what would require a fast transduction of a shoot
                      signal to the roots. Whether the signalling from shoot to
                      root after ozone exposure is mediated by the same compounds
                      as the root to shoot signalling in the mycorrhizal symbiosis
                      still remains unclear. Furthermore, the different affected
                      pathways and substances may be influenced by different
                      signalling cascades, reflecting the various re-programming
                      in plant metabolism during interactions with belowground
                      symbionts and aboveground environmental parameters.},
      cin          = {ICG-III},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)VDB49},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/46951},
}