Abstract
Ethylene emission, ascorbic acid content, peroxidase and superoxide dismutase activity were measured in four tropical tree species. Six month old saplings of Morus alba Linn., Azadirachta indica A. Juss., Melia azadirach Linn, and Syzygium jambolina Lamk. were exposed to 0.5 ppm SO2 for four hours for six consequtive days. Recovery from SO2 stress was followed for twelve days after termination of the fumigation. SO2 induced foliar ethylene emission increased during fumigation but declined following termination of fumigation. SO2 fumigation enhanced the activities of superoxide dismutase and peroxidase in all four species. Their activities, however, declined on withdrawal of SO2 stress. Ascorbic acid content decreased due to SO2 stress but exhibited recovery on termination of fumigation. The response of the four plant species was widely different both during the fumigation period and during post‐fumigation recovery regime.
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