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The effects of ozone on indoor foliage plants and their ozone removal efficiency were studied. Cissus rhombifolia Vahl, Hedera helix L., Spathiphyllum wallisii Regel, and Syngonium podophyllum Schott ‘Albo-Virens’ were exposed to 120 nLㆍL?¹ ozone for 2, 4, or 8 hㆍday?¹ for 25 days in walk-in growth chambers. Changes in stomatal conductance, transpiration rate, and intercellular CO₂ concentration were monitored throughout the light and dark periods (13/11 h) and photosynthesis and respiration during the light and dark, respectively. The injury caused by ozone and the plant’s potential for and extent of recovery varied among species. In C. rhombifolia and S. wallisii plants exposed to ozone for 8 h-day ‘, photosynthetic rate, stomatal conductance, and ozone uptake decreased throughout the 25-day treatment period. The photosynthetic rate, stomatal conductance, and ozone uptake rate of H. helix and S. podophyllum initially decreased (through day 7), but then began to recover though never reaching pre-exposure levels. Cumulative ozone uptake rate was highest in S. wallisii. Uptake rate at day 25 decreased as the daily exposure time increased. Ozone uptake by C. rhombifolia and S. aureus was significantly reduced when exposed to ozone for 8 hㆍday?¹ compared with the 2 hㆍday?¹ exposure. Ozone tolerant species had higher uptake rates. The results indicate that while plants remove environmental ozone at a significant rate, they sustain injury during the process. The extent of the injury and the plant’s ability to adapt vary with species, length of daily exposure, and duration of exposure. Photosynthetic rate and stomatal conductance provide a means in which the adverse effect of ozone on plants can be monitored.

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Abstract
Introduction
Materials and Methods
Results and Discussion
Acknowledgement
Literature Cited

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UCI(KEPA) : I410-ECN-0101-2009-525-017028116