Derivation of ozone flux-yield relationships for lettuce: a key horticultural crop

Environ Pollut. 2007 Apr;146(3):699-706. doi: 10.1016/j.envpol.2006.08.009. Epub 2006 Oct 18.


Ozone flux-response relationships were derived for lettuce, employing a multiplicative approach to model the manner in which stomatal conductance is influenced by key environmental variables, using a dataset collected during field experimentation in Crete and yield-response relationships derived from parallel open-top chamber experiments. Regional agronomic practices were adopted throughout. Computed versus measured data revealed that the derived model explained 51% (P<0.001) of the observed variation in stomatal conductance. Concentration-based indices were compared with flux-based indices. Analyses revealed a significant relationship between accumulated stomatal ozone flux and yield employing flux threshold cut-offs up to 4 nmol m(-2) s(-1). Regressions employing very low or zero flux thresholds resulted in the strongest yield-flux relationships (explaining approximately 80% (P<0.05) of the variation in the dataset).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Crops, Agricultural / drug effects
  • Crops, Agricultural / growth & development
  • Crops, Agricultural / metabolism*
  • Environment, Controlled
  • Environmental Exposure / adverse effects
  • Greece
  • Lactuca / drug effects
  • Lactuca / growth & development
  • Lactuca / metabolism*
  • Models, Biological
  • Oxidants, Photochemical / pharmacokinetics
  • Oxidants, Photochemical / toxicity*
  • Ozone / pharmacokinetics
  • Ozone / toxicity*
  • Plant Leaves / drug effects
  • Plant Leaves / metabolism
  • Risk Assessment / methods
  • Seasons
  • United Kingdom
  • Weather


  • Oxidants, Photochemical
  • Ozone