Derivation of ozone flux-yield relationships for lettuce: a key horticultural crop |
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Authors: | Goumenaki Eleni Fernandez Ignacio Gonzalez Papanikolaou Antigoni Papadopoulou Despoina Askianakis Christos Kouvarakis George Barnes Jeremy |
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Institution: | Environmental and Molecular Plant Physiology, Institute for Research on the Environment and Sustainability, School of Biology & Psychology, Division of Biology, Devonshire Building, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK. |
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Abstract: | 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). |
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