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Different responses to ozone of Tobacco, Poplar, Birch, and Alder

Different responses to ozone of Tobacco, Poplar, Birch, and Alder

Journal of Plant Physiology 148(1-2): 207-214

Plants of an ozone sensitive tobacco clone (Nicotiana tabacum L. var. BelW3), cuttings of poplar (Populus x euramericana var. Dorskamp) and birch (Betula pendula Roth), and seedlings of alder (Alnus glutinosa (L.) Gaertn.) were grown in the field or in the field fumigation chambers during one growing season. Twenty chambers (each with one plant per species) were used for four treatments with either filtered air, or filtered air with added ozone (75 ppb) from 07:00 to 19:00, or from 19:00 to 07:00, or continuously. Tobacco did not respond to ozone applied during the nighttime, but leaf injury symptoms of plants grown in the field under shade appeared at an ozone dose similar to that applied during the daytime. The leaves of the deciduous trees showed injury symptoms in all ozone treatments. In the tree species the stomatal pores were open at 06:00 (closed in tobacco), but they were narrowed at 10:00 under ozone as compared to filtered air. The time span until ozone-induced leaf injury symptoms or premature leaf loss occurred, was influenced by the species, the season, and the ozone regime. Similarities and differences, in particular in the starch metabolism or the formation of cell wall exudates, could be traced from early symptoms to cell collapse in all species. In contrast to agricultural plants, ozone impact on the leaves of deciduous trees is as important during dusk, night and dawn as during daytime.

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Accession: 008468586

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DOI: 10.1016/s0176-1617(96)80316-6

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