Ozone and water deficit reduced growth of Aleppo pine seedlings |
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| Institution: | 1. Centre de Recherches Forestières, INRA (UMR INRA UHP Ecologie et Ecophysiologie Forestières, Equipe Bioclimatologie), 54280 Champenoux, France;2. Department of Biology, University of Oulu, PO Box 3000, 90014 Oulu, Finland;1. Agrotecnio Centre, University of Lleida, Lleida, Spain;2. Transfer in Bovine Reproduction SLu, Barbastro, Spain;3. Department of Animal Science, University of Lleida, Lleida, Spain;4. Sidney Sussex College, University of Cambridge, UK;5. Ladfield, Oxnam, Jedburgh, TD8 6RJ, UK;1. Medical Engineering Program, University of Hong Kong, Pokfulam, Hong Kong;2. Medical Engineering Program, University of Hong Kong, Pokfulam, Hong Kong;1. College of Chemistry and Engineering, Wenshan University, Wenshan 663099, China;2. Department of Chemistry, Tsinghua University, Beijing 100084, China;1. Department of Environmental Biology, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy;2. Bioenergetics Laboratory, University of Geneva, CH-1254 Jussy, Geneva, Switzerland;3. Department of Agri-Food Production and Environmental Science (DISPAA), Section of Soil and Plant Science, University of Florence, Piazzale delle Cascine 28, 50144 Firenze, Italy;1. INRS-Institute Armand-Frappier, Research Laboratories in Sciences Applied to Food, Canadian Irradiation Center, 531 Blvd des Prairies, Laval, Quebec H7V 1B7, Canada;2. Department of Dietetics, Collège Montmorency, 475 Blvd de l''Avenir, Laval, Quebec H7N 5H9, Canada |
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| Abstract: | The effects of ambient and elevated ozone (O3) levels on photosynthesis, growth, pigment, biomass and element contents of Aleppo pine (Pinus halepensis Mill.) were studied for two growing seasons (1997, 1998). Two-year-old seedlings were exposed to elevated O3 in open-top chambers. The treatments were charcoal-filtered air and non-filtered air + 50 nl l–1 O3 (24 h per day, 7 days per week). In summer 1998, half of the seedlings were drought-stressed (leaf water potential down to approximately –2 MPa), while the other half were kept well-watered. At the beginning of the season (1998), current (c) and previous-year (c + 1) needles under O3 stress showed an increase in stomatal conductance and net photosynthesis. During the drought period, only stomatal conductance increased in both needle age-classes, whereas the net photosynthesis decreased. At the end of the measuring period, both parameters were reduced in the O3 treatment. Both O3 and drought decreased chlorophyll a and b concentrations, growth and biomass. A carry-over effect of O3 on pigments was also observed. Needle K content was increased in the O3 treatment. Drought protected Aleppo pine against O3 (less chlorotic mottle and less decrease of stem and branch biomass). |
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