title: Ozone exposure and flux-based response functions for photosynthetic traits in wheat, maize and poplar.
abstract: Ozone exposure- and dose-response relationships based on photosynthetic leaf traits (CO2 assimilation, chlorophyll content, Rubisco and PEPc activities) were established for wheat, maize and poplar plants grown in identical controlled conditions, providing a comparison between crop and tree species, as well as between C3 and C4 plants. Intra-specific variability was addressed by comparing two wheat cultivars with contrasting ozone tolerance. Depending on plant models and ozone levels, first-order, second-order and segmented linear regression models were used to derive ozone response functions. Overall, flux-based functions appeared superior to exposure-based functions in describing the data, but the improvement remained modest. The best fit was obtained using the POD0.5 for maize and POD3 for poplar. The POD6 appeared relevant for wheat, although intervarietal differences were found. Our results suggest that taking into account the dynamics of leaf antioxidant capacity could improve current methods for ozone risk assessment for plants.
authors.affiliation: Université Paris-Est Créteil Val de Marne, UMR 7618 Institut d'écologie et des sciences de l'environnement de Paris, 61 avenue du Général De Gaulle, F-94010 Créteil Cedex, France. Electronic address: matthieu.bagard@u-pec.fr.
authors.forename: Matthieu
authors.initials: M
authors.lastname: Bagard
authors.affiliation: Université de Lorraine, UMR1137 Ecologie et Ecophysiologie Forestières, BP 70239, F-54506 Vandoeuvre-lès-Nancy, Cedex, France; INRA, UMR1137 Ecologie et Ecophysiologie Forestières, F-54280 Champenoux, France. Electronic address: yves.jolivet@univ-lorraine.fr.
authors.forename: Yves
authors.initials: Y
authors.lastname: Jolivet
authors.affiliation: Université de Lorraine, UMR1137 Ecologie et Ecophysiologie Forestières, BP 70239, F-54506 Vandoeuvre-lès-Nancy, Cedex, France; INRA, UMR1137 Ecologie et Ecophysiologie Forestières, F-54280 Champenoux, France. Electronic address: Marie-Paule.Hasenfratz@univ-lorraine.fr.
authors.forename: Marie-Paule
authors.initials: MP
authors.lastname: Hasenfratz-Sauder
authors.affiliation: Université de Lorraine, UMR1137 Ecologie et Ecophysiologie Forestières, BP 70239, F-54506 Vandoeuvre-lès-Nancy, Cedex, France; INRA, UMR1137 Ecologie et Ecophysiologie Forestières, F-54280 Champenoux, France. Electronic address: joelle.gerard@univ-lorraine.fr.
authors.forename: Joëlle
authors.initials: J
authors.lastname: Gérard
authors.affiliation: Université de Lorraine, UMR1137 Ecologie et Ecophysiologie Forestières, BP 70239, F-54506 Vandoeuvre-lès-Nancy, Cedex, France; INRA, UMR1137 Ecologie et Ecophysiologie Forestières, F-54280 Champenoux, France. Electronic address: pierre.dizengremel@univ-lorraine.fr.
authors.forename: Pierre
authors.initials: P
authors.lastname: Dizengremel
authors.affiliation: INRA, UMR1137 Ecologie et Ecophysiologie Forestières, F-54280 Champenoux, France; Université de Lorraine, UMR1137 Ecologie et Ecophysiologie Forestières, BP 70239, F-54506 Vandoeuvre-lès-Nancy, Cedex, France. Electronic address: lethiec@nancy.inra.fr.
authors.forename: Didier
authors.initials: D
authors.lastname: Le Thiec
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000633:toxicity; D002734:Chlorophyll / Q000378:metabolism; D004781:Environmental Exposure / Q000032:analysis; D010126:Ozone / Q000032:analysis* / Q000633:toxicity; D010788:Photosynthesis / Q000187:drug effects*; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism; D032107:Populus / Q000187:drug effects* / Q000378:metabolism; D012273:Ribulose-Bisphosphate Carboxylase / Q000378:metabolism; D018570:Risk Assessment; D014197:Trees / Q000187:drug effects / Q000378:metabolism; D014908:Triticum / Q000187:drug effects* / Q000378:metabolism; D003313:Zea mays / Q000187:drug effects* / Q000378:metabolism
chemical_list: D000393:Air Pollutants; D002734:Chlorophyll; D010126:Ozone; D012273:Ribulose-Bisphosphate Carboxylase
keywords: Crops; Dose-response relationships; Ozone; Photosynthesis; Trees