TEMPERATURE EFFECTS ON TOMATO RESPONSE TO OZONE AT CONSTANT VAPOR PRESSURE DEFICIT

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The increasing concentrations of "greenhouse" gases in the troposphere are of concern to environmentalists. One of these gases, ozone (O_3), is a serious agricultural phytotoxin. Increased temperatures resulting from elevated concentrations of the "greenhouse" gases could modify plant response to O_3. However, apparent temperature effects may be the result of vapor pressure deficit (VPD) differences. Young tomato plants (cv. New Yorker Special) were exposed to four maximum O_3 concentrations (0.04, 0.08, 0.12 and 0.16μl 1^<-1> delivered in an eight hour dynamic exposure profile at three temperatures (20, 25 and 30℃). Vapor pressure deficit effects were minimized by creating similar VPD's at all temperatures. When this was done, modification of plant response to O_3 by temperature was found in only two of eleven variables examined, namely, stem fresh weight and specific leaf area. In these variables the plant response to O_3 at 25℃ was significantly greater than that at 20℃. In contrast, O_3 had significant effects regardless of temperature on all but one of the response variables. No temperature modification of response to O_3 was discovered in root fresh and dry weights, stem dry weight, leaf fresh and dry weights, leaf area, plant height, height: stem dry weight and root: shoot ratios. This suggests that in young tomato plants, over the range of temperatures studied, temperature has little effect on response to O_3. This reseach also demonstrated that future studies of the effect of temperature on plant response to air pollutants can and should be conducted with constant VPD regardless of temperature.
九州大学の論文

TEMPERATURE EFFECTS ON TOMATO RESPONSE TO OZONE AT CONSTANT VAPOR PRESSURE DEFICIT

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