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@ARTICLE{Giday:138605,
      author       = {Giday, H. and Fanourakis, Dimitrios and Kjaer, K. H. and
                      Fomsgaard, I. S. and Ottosen, C.-O.},
      title        = {{F}oliar abscisic acid content unterlies genotypic
                      variation in stomatal responsiveness after growth at high
                      relative air humidity},
      journal      = {Annals of botany},
      volume       = {112},
      number       = {9},
      issn         = {1095-8290},
      address      = {Oxford},
      publisher    = {Oxford University Press},
      reportid     = {FZJ-2013-04703},
      pages        = {1857 - 1867},
      year         = {2013},
      abstract     = {Background and Aims Stomata formed at high relative air
                      humidity (RH) respond less to abscisic acid (ABA), an effect
                      that varies widely between cultivars. This study tested the
                      hypotheses that this genotypic variation in stomatal
                      responsiveness originates from differential impairment in
                      intermediates of the ABA signalling pathway during closure
                      and differences in leaf ABA concentration during
                      growth.Methods Stomatal anatomical features and stomatal
                      responsiveness to desiccation, feeding with ABA, three
                      transduction elements of its signalling pathway (H2O2, NO,
                      Ca2+) and elicitors of these elements were determined in
                      four rose cultivars grown at moderate (60 $\%)$ and high (90
                      $\%)$ RH. Leaf ABA concentration was assessed throughout the
                      photoperiod and following mild desiccation (10 $\%$ leaf
                      weight loss).Key Results Stomatal responsiveness to
                      desiccation and ABA feeding was little affected by high RH
                      in two cultivars, whereas it was considerably attenuated in
                      two other cultivars (thus termed sensitive). Leaf ABA
                      concentration was lower in plants grown at high RH, an
                      effect that was more pronounced in the sensitive cultivars.
                      Mild desiccation triggered an increase in leaf ABA
                      concentration and equalized differences between leaves grown
                      at moderate and high RH. High RH impaired stomatal responses
                      to all transduction elements, but cultivar differences were
                      not observed.ConclusionsHigh RH resulted in decreased leaf
                      ABA concentration during growth as a result of lack of water
                      deficit, since desiccation induced ABA accumulation.
                      Sensitive cultivars underwent a larger decrease in leaf ABA
                      concentration rather than having a higher ABA concentration
                      threshold for inducing stomatal functioning. However,
                      cultivar differences in stomatal closure following ABA
                      feeding were not apparent in response to H2O2 and downstream
                      elements, indicating that signalling events prior to H2O2
                      generation are involved in the observed genotypic
                      variation.},
      cin          = {IBG-2},
      ddc          = {580},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {242 - Sustainable Bioproduction (POF2-242)},
      pid          = {G:(DE-HGF)POF2-242},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000327717100016},
      pubmed       = {pmid:24163176},
      doi          = {10.1093/aob/mct220},
      url          = {https://juser.fz-juelich.de/record/138605},
}