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@ARTICLE{Pieruschka:10542,
      author       = {Pieruschka, R. and Huber, G. and Berry, J.A.},
      title        = {{C}ontrol of transpiration by radiation},
      journal      = {Proceedings of the National Academy of Sciences of the
                      United States of America},
      volume       = {107},
      issn         = {0027-8424},
      address      = {Washington, DC},
      publisher    = {Academy},
      reportid     = {PreJuSER-10542},
      pages        = {13372 - 13377},
      year         = {2010},
      note         = {We acknowledge Keith Mott for suggesting the use of near
                      infrared light, Keith Mott, Bernard Genty, and Peter Franks
                      for many discussions that helped us form our ideas, and two
                      reviewers who helped us better express them. We thank Denis
                      Klimov for help with light sources and Larry Giles for
                      technical assistance. R. P. was supported by a Marie Curie
                      fellowship (LIFT 041060) during this work.},
      abstract     = {The terrestrial hydrological cycle is strongly influenced
                      by transpiration--water loss through the stomatal pores of
                      leaves. In this report we present studies showing that the
                      energy content of radiation absorbed by the leaf influences
                      stomatal control of transpiration. This observation is at
                      odds with current concepts of how stomata sense and control
                      transpiration, and we suggest an alternative model.
                      Specifically, we argue that the steady-state water potential
                      of the epidermis in the intact leaf is controlled by the
                      difference between the radiation-controlled rate of water
                      vapor production in the leaf interior and the rate of
                      transpiration. Any difference between these two potentially
                      large fluxes is made up by evaporation from (or condensation
                      on) the epidermis, causing its water potential to pivot
                      around this balance point. Previous work established that
                      stomata in isolated epidermal strips respond by opening with
                      increasing (and closing with decreasing) water potential.
                      Thus, stomatal conductance and transpiration rate should
                      increase when there is condensation on (and decrease when
                      there is evaporation from) the epidermis, thus tending to
                      maintain homeostasis of epidermal water potential. We use a
                      model to show that such a mechanism would have control
                      properties similar to those observed with leaves. This
                      hypothesis provides a plausible explanation for the
                      regulation of leaf and canopy transpiration by the radiation
                      load and provides a unique framework for studies of the
                      regulation of stomatal conductance by CO(2) and other
                      factors.},
      keywords     = {Carbon Dioxide: metabolism / Helianthus: metabolism /
                      Helianthus: physiology / Light / Models, Biological /
                      Nerium: metabolism / Nerium: physiology / Photosynthesis:
                      physiology / Photosynthesis: radiation effects / Plant
                      Leaves: physiology / Plant Stomata: metabolism / Plant
                      Stomata: physiology / Plant Transpiration: physiology /
                      Trees: metabolism / Trees: physiology / Water: metabolism /
                      Xanthium: metabolism / Xanthium: physiology / Carbon Dioxide
                      (NLM Chemicals) / Water (NLM Chemicals) / J (WoSType)},
      cin          = {ICG-3},
      ddc          = {000},
      cid          = {I:(DE-Juel1)ICG-3-20090406},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Multidisciplinary Sciences},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:20624981},
      pmc          = {pmc:PMC2922126},
      UT           = {WOS:000280602800035},
      doi          = {10.1073/pnas.0913177107},
      url          = {https://juser.fz-juelich.de/record/10542},
}