<紀要論文>
TEMPERATURE EFFECTS ON TOMATO RESPONSE TO OZONE AT CONSTANT VAPOR PRESSURE DEFICIT

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概要 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 temperature...s 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.続きを見る

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登録日 2009.04.22
更新日 2015.11.06