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Studies on the combined effect of low levels air pollutants on plants iv. relationship between intraspecific difference of ozone sensitivity and ozone and or sulfur dioxide uptake rate in kidney bean



Studies on the combined effect of low levels air pollutants on plants iv. relationship between intraspecific difference of ozone sensitivity and ozone and or sulfur dioxide uptake rate in kidney bean



Denryoku Chuo Kenkyusho Hokoku (U87072): 1-16



Cultivars of bean plants, Phaseolus vulgaris L., vary in their foliar responses to O3. We investigated the relationships between cultivar differences in O3 foliar responses and pollutants uptake rate. Three cultivars of bean plants were exposed to 40 ppb O3 for 2.5 h and then 80 ppb O3 for 2.5 h. Net fluxes of O3, water vapor and CO2 were simultaneously measured in the assimilation chamber. Foliar sensitive cultivar to O3 (Wonder Crop No. 2) showed higher O3 uptake rate than a resistant one (French's Horticultural). And the O3 uptake rate of intermediate sensitive cultivar (Green Lord) showed middle-ranged value of another two cultivars. We found a linear relationship between the O3 uptake rates per unit O3 concentration and the gas phase diffusive conductance for water vapor in the three cultivars. It is suggested that these cultivar differences in the O3 uptake rates resulted from intraspecific difference in the gas phase diffusive conductances. Then two cultivars were exposed to O3 and SO2 simultaneously at concentrations of 40 ppb at various light intensities. The uptake rates of O3 and SO2 and the gas phase diffusive conductance increased with increasing light intensity. The uptake rates of O3 and SO2 per unit gas concentration had linear relationships with the gas phase diffusive conductance of water vapor determined at various light intensities. The uptake rate of O3 per unit O3 concentration was compatable to the SO2 uptake rate per unit SO2 concentration at a given gas phase diffusive conductance. The O3 resistant cultivar showed lower uptake rates of O3 and SO2 and lower gas phase diffusive conductance than those of sensitive cultivar. These results suggested that the diffusion of gases might determine the uptake of air pollutants. Furthermore, these cultivar differences in the pollutants uptake rates were determined by the intraspecific differences in the gas phase diffusive conductance.

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