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Effects of Elevated Ozone on Photosynthetic CO2 Exchange and Chlorophyll a Fluorescence in Leaves of Quercus mongolica Grown in Urban Area


The aim of this study was to determine the responses of photosynthesis in leaves of Quercus mongolica to elevated O3 exposure in an urban area. The results showed that the photosynthesis parameters were all decreased by the elevated O3 during the whole season. Especially, light-saturated net photosynthetic rate (A) was reduced about 72% after 45 days exposure, and over the whole growing season, the differences were significant (p < 0.05) compared with control. The reduction is related to both stomatal and non-stomatal factors, including a decrease (about 9%) in the maximum quantum yield of PSII photochemistry (F v/F m) detected after 90 days O3 exposure.

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This work was supported by the National Natural Science Foundation of China (90411019). The authors wish to thank Prof. Tao for his help in revision of manuscript.

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Correspondence to Xingyuan He.

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Wang, L., He, X. & Chen, W. Effects of Elevated Ozone on Photosynthetic CO2 Exchange and Chlorophyll a Fluorescence in Leaves of Quercus mongolica Grown in Urban Area. Bull Environ Contam Toxicol 82, 478–481 (2009).

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  • Elevated O3
  • Photosynthetic CO2 exchange
  • Chlorophyll a fluorescence
  • Leaf growth