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@PHDTHESIS{Schmittgen:188143,
      author       = {Schmittgen, Simone},
      title        = {{E}ffects of {C}ercospora leaf spot disease on sugar beet
                      genotypes with contrasting disease susceptibility},
      volume       = {244},
      school       = {Universität Düsseldorf},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2015-01604},
      isbn         = {978-3-95806-021-0},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {121 S.},
      year         = {2015},
      note         = {Universität Düsseldorf, Diss., 2014},
      abstract     = {The fungal pathogen Cercospora beticola causes the most
                      destructive foliar diseas eof sugar beet, namely Cercospora
                      leaf spot (CLS), which results in economically important
                      yield losses. Current breeding efforts aim at developing
                      sugar beet lines with lower fungal susceptibility as well as
                      high productivity to ensure reduced fungicide applications
                      in the context of integrated pest management. However, the
                      main challenge remains to select sugar beet genotypes that
                      produce the required yield quality and quantity, and to
                      quantify their defense ability. Well-established visual
                      disease scoring can be supported and supplemented by new
                      techniques that enable earlier disease detection and
                      genotype resistance classification. In this thesis, visual
                      disease scoring was combined with novel invasive and
                      non-invasive techniques toanalyze shoot and root disease
                      responses to Cercospora infection. The fungal growth within
                      the sugar beet leaf tissue was quantified using molecular
                      analysis of the fungal calmodulin gene. This allows for the
                      pre-selection of resistant genotypes before disease symptoms
                      were visible. It could be shown that plants with high
                      susceptibility (HS) allowed a stronger fungal colonization
                      in the leaf tissue than ones with low susceptibility (LS).
                      These results correlated with the respective disease
                      severity. The HS genotypes consistently displayed more
                      severe disease symptoms than LS plants. In particular, the
                      moderately susceptible (MS) genotype seemed to be a
                      promising candidate according to its variable response
                      indicating a more adaptable reaction to changing
                      environmental conditions. Therefore, this MS genotype might
                      produce more yield under low-to-moderate disease pressure
                      compared with HS plants, which would be comparatively more
                      strongly infected and deliver reduced yield. The cuticle
                      forms a barrier between the plant and the environment and
                      therefore provides resistance against pathogens. Cuticular
                      wax may affect host-pathogen recognition and conidia
                      adhesion on the leaf surface. In this study, LS plants
                      werefound to contain larger amounts of cuticular waxes.
                      Mature leaves, which showed reduced fungal colonization,
                      also had higher wax levels than immature leaves. Further
                      experiments are needed to investigate the precise role of
                      sugar beet cuticular waxes on C. beticola infections.[...]},
      keywords     = {Dissertation (GND)},
      cin          = {IBG-2},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/188143},
}