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@ARTICLE{Behn:15917,
      author       = {Behn, H. and Albert, A. and Marx, F. and Noga, G. and
                      Ulbrich, A.},
      title        = {{U}ltraviolet-{B} and {P}hotosynthetically {A}ctive
                      {R}adiation {I}nteractively {A}ffect {Y}ield and {P}attern
                      of {M}onoterpenes in {L}eaves of {P}eppermint ({M}entha x
                      piperita {L}.)},
      journal      = {Journal of agricultural and food chemistry},
      volume       = {58},
      issn         = {0021-8561},
      address      = {Washington, DC [u.a.]},
      publisher    = {American Chemical Society (ACS)},
      reportid     = {PreJuSER-15917},
      pages        = {7361 - 7367},
      year         = {2010},
      note         = {The work was funded by the German Federal Ministry of
                      Education and Research, Project 0330724D.},
      abstract     = {Solar radiation is a key environmental signal in regulation
                      of plant secondary metabolism. Since metabolic responses to
                      light and ultraviolet (UV) radiation exposure are known to
                      depend on the ratio of spectral ranges (e.g., UV-B/PAR), we
                      examined effects of different UV-B radiation (280-315 nm)
                      and photosynthetically active radiation (PAR, 400-700 nm)
                      levels and ratios on yield and pattern of monoterpenoid
                      essential oil of peppermint. Experiments were performed in
                      exposure chambers, technically equipped for realistic
                      simulation of natural climate and radiation. The
                      experimental design comprised four irradiation regimes
                      created by the combination of two PAR levels including or
                      excluding UV-B radiation. During flowering, the highest
                      essential oil yield was achieved at high PAR (1150 micromol
                      m(-2) s(-1)) and approximate ambient UV-B radiation (0.6 W
                      m(-2)). Regarding the monoterpene pattern, low PAR (550
                      micromol m(-2) s(-1)) and the absence of UV-B radiation led
                      to reduced menthol and increased menthone contents and
                      thereby to a substantial decrease in oil quality. Essential
                      oil yield could not be correlated with density or diameter
                      of peltate glandular trichomes, the epidermal structures
                      specialized on biosynthesis, and the accumulation of
                      monoterpenes. The present results lead to the conclusion
                      that production of high quality oils (fulfilling the
                      requirements of the Pharmacopoeia Europaea) requires high
                      levels of natural sunlight. In protected cultivation, the
                      use of UV-B transmitting covering materials is therefore
                      highly recommended.},
      keywords     = {Mentha piperita: metabolism / Mentha piperita: radiation
                      effects / Monoterpenes: metabolism / Photosynthesis / Plant
                      Leaves: metabolism / Plant Leaves: radiation effects /
                      Ultraviolet Rays / Monoterpenes (NLM Chemicals) / J
                      (WoSType)},
      cin          = {IBG-2},
      ddc          = {630},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Agriculture, Multidisciplinary / Chemistry, Applied / Food
                      Science $\&$ Technology},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:20481601},
      UT           = {WOS:000278704000036},
      doi          = {10.1021/jf9046072},
      url          = {https://juser.fz-juelich.de/record/15917},
}