ISHS Acta Horticulturae 496: International Symposium on Urban Tree Health
EFFECTS OF OZONE ON PHOTOSYNTHESIS OF MEDITERRANEAN URBAN ORNAMENTAL PLANTS |
| Authors: | G. Lorenzini, C. Nali, G. Ligasacchi, R. Ambrogi |
| Keywords: | air pollution, Arbutus, Hedera, Laurus, Nerium, Viburnum |
| Abstract:
Measurements of leaf gas exchange under saturating light were performed on plants of six species during and after a short-term treatment with ozone (200 ppb, 5 h). Reductions of photosynthetic activity were observed in all the species; they were associated to stomatal closure and/or mesophyll limitations. Laurus nobilis and Hedera canariensis var. azorica showed a quick reduction of stomatal conductance, with a consequential limitation of photosynthetic activity; this species was able to fully recover before the end of the fumigation. Nerium oleander and Hedera helix also showed a significant reduction of photosynthetic activity, associated to a partial stomatal closure. Photosynthetic efficiency of Viburnum tinus and Arbutus unedo was affected only after the end of the treatment, the main effects being non-stomatal. | |
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