Abstract
The influence of a 7 °C range of air temperature (28 to 35 °C) on plant response to SO2 (0.4 μL L−1 for 7 hr) was investigated in herbaceous (Zea mays) and woody (Liriodendron tulipifera and Fraxinus pennsylvanica) species. The indices of plant response were SO2-induced changes in photosynthesis and the transpiration ratio. The physiological basis of differences in response as a function of temperature was evaluated through determination of SO2 flux to foliage. The most consistent influence of the higher temperature for all three species was an increase of 20 to 50% in the foliar S content. The transpiration ratio and photosynthesis were more responsive to SO2 at the higher temperature in both woody species but less responsive in Z. mays. Thus, the pattern of SO2-induced injury as a function of temperature was not consistent among all species. Several mechanisms are proposed to account for the increase in SO2 flux at higher temperatures, including a change in stomatal conductance and direct temperature effects on the conductivity of the diffusive media (gas and liquid phase) and the kinetic energy of SO2 molecules. Since the pattern of temperature-dependent plant responses to SO2 was species-specific, generalizations about the modifying role of temperature on plant responses to SO2 are limited.
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Research sponsored by the Office of Health and Environmental Research, U.S. Department of Energy, under Contract No. DE-AC05-84OR21400 with Martin Marietta Energy Systems, Inc.
Publication No. 2451, Environmental Sciences Division, ORNL.
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Taylor, G.E., Selvidge, W.J. & Crumbly, I.J. Temperature effects on plant response to sulfur dioxide in Zea mays, Liriodendron tulipifera, and Fraxinus pennsylyanica . Water Air Soil Pollut 24, 405–418 (1985). https://doi.org/10.1007/BF00282491
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DOI: https://doi.org/10.1007/BF00282491