Studies on Relationships between Ozone Absorption Rate and Stomatal Diffusion Resistance of Plant Leaf
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Effects of ozone, the major component of photochemical oxidants, on apparent photosynthesis, transpiration and diffusion resistance were investigated for attached leaves of rice, corn and bean plants. Ozone absorption rate of leaf was measured by assimilation chamber method, and the interrelationships between ozone absorption rate, transpiration rate and stomatal diffusion resistance were investigated. A simple gas diffusion model was adapted for ozone absorption mechanism of plant leaf.<BR>The results onbtaied were as follows:<BR>1) Decrease in apparent photosynthetic rate during ozone fumigation was mainly caused by stomatal closure. The degree of stomatal closure by ozone varied with plant species: Rice was most sensitive to ozone, corn and bean were less sensitive in turns.<BR>2) Observed values of ozone absorption rate by attached plant leaf agreed satisfactorily with the values calculated from gas diffusion model by the assumption that ozone concentration in gaseous phase of surface of leaf mesophyll cell is zero. Therefore, it was shown that ozone absorption rate of plant leaf is controlled directly with the gas diffusion resistances, mostly, the stomatal diffusion resistance.<BR>3) Ozone absorption rate was repressed by stomatal closure during ozone fumigation. It might be possible that the difference in stomatal responces to ozone influences the degree of the oxidants damage on plant growth, through the quantity of ozone incorporated into leaf.<BR>4) The relationships between ozone concentration and ozone absorption rate was linear in the region of low ozone concentration. Whereas, in the region of relatively high ozone concentration, ozone absorption rate showed the tendency to saturate by the stomatal closure during ozone fumigation.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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