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Comparison of ozone-induced leaf injury observed in the ozone-tolerant clone 245 (left) and the ozone-sensitive clone 388 (right). Cuttings were grown in the greenhouse for 6 to 8 weeks before being transferred to chambers, where they were allowed to acclimate for 2 to 3 d before treatment with 300 ppb ozone for 6 h daily. The photograph was taken 36 h after the start of the first 6 h of ozone fumigation.
