title: Ozone induces stomatal narrowing in European and Siebold's beeches: a comparison between two experiments of free-air ozone exposure.
abstract: Stomata tend to narrow under ozone (O(3)) impact, leading to limitation of stomatal O(3) influx. Here, we review stomatal response under recently conducted free-air O(3) exposure experiments on two species of the same tree genus: Fagus sylvatica at Kranzberg Forest (Germany) and F. crenata at Sapporo Experimental Forest (Japan). Both beeches exhibited reduction in stomatal conductance (gs) by 10-20% under experimentally enhanced O(3) regimes throughout the summer relative to ambient-air controls. Stomatal narrowing occurred, in early summer, in the absence of reduced carboxylation capacity of Rubisco, although photosynthetic net CO(2) uptake rate temporarily reflected restriction to some minor extent. Observed stomatal narrowing was, however, diminished in autumn, suggesting gradual loss of stomatal regulation by O(3). Monotonic decline in gs with cumulative O(3) exposure or flux in current modeling concepts appear to be unrealistic in beech.
authors.affiliation: Silviculture and Forest Ecological Studies, Hokkaido University, Sapporo 060-8689, Japan. Electronic address: hoshika0803@gmail.com.
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Hoshika
authors.affiliation: Institute of Agriculture, Tokyo University of Agriculture and Technology, Fuchu 183-8509, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Watanabe
authors.affiliation: Department of Plant Ecology, Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan.
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Kitao
authors.affiliation: Ecophysiology of Plants, Technische Universität München, Von-Carlowitz-Platz 2, D-85354 Freising, Germany.
authors.forename: Karl-Heinz
authors.initials: KH
authors.lastname: Häberle
authors.affiliation: Ecophysiology of Plants, Technische Universität München, Von-Carlowitz-Platz 2, D-85354 Freising, Germany.
authors.forename: Thorsten E E
authors.initials: TE
authors.lastname: Grams
authors.affiliation: Silviculture and Forest Ecological Studies, Hokkaido University, Sapporo 060-8689, Japan. Electronic address: tkoike@for.agr.hokudai.ac.jp.
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Koike
authors.affiliation: Ecophysiology of Plants, Technische Universität München, Von-Carlowitz-Platz 2, D-85354 Freising, Germany. Electronic address: matyssek@wzw.tum.de.
authors.forename: Rainer
authors.initials: R
authors.lastname: Matyssek
mesh_terms: D000388:Air; D000393:Air Pollutants / Q000633:toxicity*; D029964:Fagus / Q000187:drug effects* / Q000502:physiology; D005858:Germany; D007564:Japan; D010126:Ozone / Q000633:toxicity*; D010788:Photosynthesis / Q000187:drug effects; D054046:Plant Stomata / Q000187:drug effects* / Q000502:physiology; D012621:Seasons; D014197:Trees / Q000187:drug effects
chemical_list: D000393:Air Pollutants; D010126:Ozone
keywords: European beech (Fagus sylvatica L.); O(3) FACE; Siebold's beech (Fagus crenata); Stomatal narrowing; Tropospheric ozone