Effects of pre-exposure to ultraviolet-B radiation on responses of tomato ( Lycopersicon esculentum cv. New Yorker) to ozone in ambient and elevated carbon dioxide

• Published in: Environmental pollution (1987) Vol. 110; no. 2; pp. 217 - 224
• Main Authors: Hao, X, Hale, B.A, Ormrod, D.P, Papadopoulos, A.P
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.11.2000; Elsevier
• Subjects: Animal, plant and microbial ecology; Applied ecology; Biological and medical sciences; Carbon dioxide; Ecotoxicology, biological effects of pollution; Effects of pollution and side effects of pesticides on plants and fungi; Fundamental and applied biological sciences. Psychology; Growth; Lycopersicon esculentum; Non agrochemicals pollutants; Ozone; Phytopathology. Animal pests. Plant and forest protection; Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors; Pollution effects. Side effects of agrochemicals; Tomato, Lycopersicon esculentum; Ultraviolet-B; UV-absorbing compounds; Ozone; Ultraviolet-B; UV-absorbing compounds; Growth; Tomato, Lycopersicon esculentum; Carbon dioxide; Chlorophyll; Photoprotector; UVB radiation; Medium enrichment; Vegetable crop; Dicotyledones; Angiospermae; Lycopersicon esculentum; Air pollution; Spermatophyta; Solanaceae; Gas exchange; Biological accumulation; Photosynthesis
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/S0269-7491(99)00305-X

“Capsule”: Pre-exposure to enhanced UV-B mitigated ozone damage to leaf photosynthesis at elevated carbon dioxide concentrations. Patterns of environmental change in the biosphere include concurrent and sequential combinations of increasing ultraviolet (UV-B) and ozone (O 3) at increasing carbon dioxide (CO 2) levels; long-term changes are resulting mainly from stratospheric O 3 depletion, greater tropospheric O 3 photochemical synthesis, and increasing CO 2 emissions. Effects of selected combinations were evaluated in tomato ( Lycopersicon esculentum cv. New Yorker) seedlings using sequential exposures to enhanced UV-B radiation and O 3 in differential CO 2 concentrations. Ambient (7.2 kJ m −2 day −1) or enhanced (13.1 kJ m −2 day −1) UV-B fluences and ambient (380 μl l −1) or elevated (600 μl l −1) CO 2 were imposed for 19 days before exposure to 3-day simulated O 3 episodes with peak concentrations of 0.00, 0.08, 0.16 or 0.24 μl l −1 O 3 in ambient or elevated CO 2. CO 2 enrichment increased dry mass, leaf area, specific leaf weight, chlorophyll concentration and UV-absorbing compounds per unit leaf area. Exposure to enhanced UV-B increased leaf chlorophyll and UV-absorbing compounds but decreased leaf area and root/shoot ratio. O 3 exposure generally inhibited growth and leaf photosynthesis and did not affect UV-absorbing compounds. The highest dose of O 3 eliminated the stimulating effect of CO 2 enrichment after ambient UV-B pre-exposure on leaf photosynthesis. Pre-exposure to enhanced UV-B mitigated O 3 damage to leaf photosynthesis at elevated CO 2.