Growth and foliar injury responses of maize,soybean and tomato seedlings exposed to mixtures of ozone and sulphur dioxide |
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| Affiliation: | 1. Department of Horticultural Science, University of Guelph, Guelph, Ontario, N1G 2W1 Canada;2. Departments of Animal and Poultry Science and Mathematics and Statistics, University of Guelph, Guelph, Ontario, N1G 2W1 Canada;1. Department of Botany, Aligarh Muslim University, Aligarh 202 002, India;2. Botany Section, Women’s College, Aligarh Muslim University, Aligarh 202 002, India;3. Radiation Technology Development Division, BARC, Mumbai 400 085, India;1. Earth and Life Institute, Université catholique de Louvain, Croix du Sud 2, L7.05.14, 1348 Louvain-la-Neuve, Belgium;2. Centre de Michamps ASBL, Horritine 1, 6600, Michamps, Belgium;3. Department of Agronomy and Plant Genetics, University of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Circle, 55108-6026 St. Paul, MN, USA;1. ENEA, Casaccia, Rome, Italy;2. ACRI-HE, Sophia Antipolis-Cedex, France;3. CREA-RPS, Rome, Italy;4. FMI, Helsinki, Finland;5. CNR, Florence, Italy;1. Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada;2. RG Plant Cytogenomics, Central European Institute of Technology, 625 00 Brno, Czech Republic;3. National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic;4. Biosystematics Group, Wageningen University, 6708 PB Wageningen, The Netherlands;5. School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USA;1. Université du Québec à Montréal, Département des sciences biologiques, C.P. 8888, Succ. Centre Ville, Montreal (Quebec) H3C 3P8, Canada;2. Centre de recherche sur les grains (CÉROM), 740, chemin Trudeau, Saint-Mathieu-de-Beloeil (Québec) J3G 0E2, Canada;1. Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil;2. University of Nebraska – Lincoln, 68583, Lincoln, NE, USA;3. Instituto Rio Grandense do Arroz, 94930-030, Cachoeirinha, RS, Brazil |
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| Abstract: | A full factorial experiment in controlled-environment chambers with three levels of ozone (O3) (0, 0.08 and 0.15 μl l−1) and four levels of sulphur dioxide (SO2) (0, 0.03, 0.12 and 0.30 μl l−1 for 6 h per day for 7 days) was used to obtain dose-response relationships for growth and foliar injury. Non-destructive covariate measurements were used to increase precision. All maize (Zea mays L., cv. Golden Jubilee) response variables had significant interactive effects between the pollutants. Soybean (Glycine max L., cv. Maple Arrow) leaf and stem dry weights had significant interactive effects between the pollutants. For tomato (Lycopersicon esculentum Mill., cv. New Yorker), leaf dry- and fresh-weights and visible injury had significant interactive effects between the pollutants. In all species, some growth variables were stimulated by the intermediate levels of single and/or combined pollutant treatments. In contrast, visible foliar injury increased with each concentration increment of single or mixed gases. A supplementary experiment involving two levels of O3 and two levels of SO2 indicated that dry matter allocation to roots and shoots varied with treatment and species. |
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