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Photosynthesis, chloroplast pigments, and antioxidants in Pinus canariensis under free-air ozone fumigation |
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| Authors: | Ch Then K Herbinger C Heerdt G Wieser |
| Institution: | a Federal Research and Training Centre for Forests, Natural Hazards and Landscape, Unit of Alpine Timberline Ecophysiology, Rennweg 1, A-6020 Innsbruck, Austria b Institute for Plant Sciences, University of Graz, Schubertstr. 51, A-8010 Graz, Austria c Fundación Centro de Estudios Ambientales del Mediterráneo (CEAM) Dpto, Restauración Forestal, University of Alicante, Department of Ecology, Faculty of Sciences, Ap 99, Ctra. San Vicente del Raspeig s/n, San Vicente del Raspeig 03690, Alicante, Spain d Ecoclimatology (formerly: Bioclimatology and Air Pollution Research), Am Hochanger 13, D-85354 Freising, Germany e Ecophysiology of Plants, Department of Ecology, Technische Universität München, Life Science Center Weihenstephan, Am Hochanger 13, D-85354 Freising, Germany |
| Abstract: | High O3 levels, driving uptake and challenging defense, prevail on the Canary Islands, being associated with the hot and dry summers of the Mediterranean-type climate. Pinus canariensis is an endemic conifer species that forms forests across these islands. We investigated the effects of ozone on photosynthesis and biochemical parameters of P. canariensis seedlings exposed to free-air O3 fumigation at Kranzberg Forest, Germany, where ambient O3 levels were similar to those at forest sites in the Canary Islands. The twice-ambient O3 regime (2xO3) neither caused visible injury-like chlorotic or necrotic spots in the needles nor significantly affected violaxanthin, antheraxanthin and zeaxanthin levels and the de-epoxidation state of the xanthophyll cycle. In parallel, stomatal conductance for water vapour, net photosynthesis, intercellular CO2 concentration, chlorophyll fluorescence parameters, as well as antioxidant levels were hardly affected. It is concluded that presently prevailing O3 levels do not impose severe stress on P. canariensis seedlings. |
| Keywords: | Ozone Mediterranean climate Canary Island pine |
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