title: Models of fluorescence and photosynthesis for interpreting measurements of solar-induced chlorophyll fluorescence.
abstract: We have extended a conventional photosynthesis model to simulate field and laboratory measurements of chlorophyll fluorescence at the leaf scale. The fluorescence paramaterization is based on a close nonlinear relationship between the relative light saturation of photosynthesis and nonradiative energy dissipation in plants of different species. This relationship diverged only among examined data sets under stressed (strongly light saturated) conditions, possibly caused by differences in xanthophyll pigment concentrations. The relationship was quantified after analyzing data sets of pulse amplitude modulated measurements of chlorophyll fluorescence and gas exchange of leaves of different species exposed to different levels of light, CO2, temperature, nitrogen fertilization treatments, and drought. We used this relationship in a photosynthesis model. The coupled model enabled us to quantify the relationships between steady state chlorophyll fluorescence yield, electron transport rate, and photosynthesis in leaves under different environmental conditions.
  
  
  CONCLUSIONS
  Light saturation of photosynthesis determines quenching of leaf fluorescenceWe incorporated steady state leaf fluorescence in a photosynthesis model.
authors.affiliation: Department of Water Resources, Faculty ITC, University of Twente Enschede, Netherlands.
authors.forename: C
authors.initials: C
authors.lastname: van der Tol
authors.affiliation: Department of Global Ecology, Carnegie Institution of Washington Stanford, California, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Berry
authors.affiliation: Joint Center for Environmental Technology, University of Maryland, Baltimore County Baltimore, Maryland, USA.
authors.forename: P K E
authors.initials: PK
authors.lastname: Campbell
authors.affiliation: Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH Jülich, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Rascher
keywords: chlorophyll fluorescence; electron transport; photosynthesis