Effects of sulfur dioxide and ozone on intact leaves and isolated mesophyll cells of groundnut plants (Arachis hypogaea L.) |
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| Authors: | Taizo Hogetsu Motoko Shishikura |
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| Institution: | (1) Department of Forestry, Faculty of Agriculture, University of Tokyo, Bunkyo-ku, 113 Tokyo, Japan;(2) Present address: Department of Environmental Conservation, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 186 Fuchu, Tokyo, Japan |
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| Abstract: | Difference between effects of sulfur dioxide (SO2) and ozone (O3) on groundnut plants (Arachis hypogaea L.) was studied by use of an exposure system of enzymatically-isolated mesophyll cells. SO2 inhibited photosynthesis of intact groundnut leaves but induced no visible injury on leaves. SO2 also inhibited photosynthesis of isolated mesophyll cells but did not kill the cells, suggesting that SO2 inhibits photosynthesis by attacking rather specifically the photosynthetic apparatus in chloroplasts. O3 inhibited photosynthesis of intact leaves and at the same time induced visible injury corresponding to the extent of photosynthesis
inhibition. O3 also inhibited photosynthesis of isolated mesophyll cells and killed the cells to the extent corresponding to photosynthesis
inhibition, suggesting that O3 inhibits photosynthesis not directly by attacking the photosynthetic apparatus but indirectly by killing cells. Since the
response of intact leaves to each pollutant resembled that of isolated mesophyll cells, the difference between responses of
intact leaves to both pollutants may considerably reflect that of mesophyll cells. |
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| Keywords: | Air pollutant Cell viability Photosynthesis Stomata Visible injury |
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