Plant Physiol. Drug Metab Dispos
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Plant Physiology 76:400-402 (1984)
© 1984 American Society of Plant Biologists

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Articles

Fusicoccin and Air Pollutant Injury to Plants 1

Evidence for Enhancement of SO2 but Not O3 Injury

David M. Olszyk and David T. Tingey

Statewide Air Pollution Research Center, University of California, Riverside, Riverside, California 92521, United States Environmental Protection Agency, Corvallis, Oregon 97333

Garden peas (Pisum sativum L. cv Alsweet) and a tomato mutant (Lycopersicon esculentum Mill. var flacca) were sprayed with fusicoccin, a fungal toxin affecting membrane transport properties, before exposure to SO2 or O3. Tomatoes treated with 10 micromolar fusicoccin and exposed to SO2 (0.6 microliter per liter for 2 hours) exhibited twice as much foliar necrosis as untreated plants exposed to SO2. Peas treated with fusicoccin and exposed to SO2 (0.7 to 1.0 microliter per liter for 2 hours) exhibited 2 to 6 times more injury than untreated plants exposed to SO2. Peas treated with fusicoccin and exposed to O3 had less injury than untreated plants exposed to O3 (0.1 to 0.3 microliter per liter for 2 hours). Several lines of evidence suggested that the fusicoccin enhancement of SO2 injury is not the result of increased gas exchange, i.e. the tomato mutant has permanently open stomata under all conditions, and in peas fusicoccin had no effect on SO2 or H2O flux in plants exposed to 0.12 microliter per liter SO2. However, a 21% greater leaf conductance in fusicoccin treated versus untreated plants indicated the possibility of some differences in gas exchange for peas exposed to 1.0 microliter per liter SO2.

1 Contribution from the United States Environmental Protection Agency Environmental Research Laboratory, Corvallis, Oregon. The senior author was sponsored by a National Research Council Postdoctoral Research Associate Grant.






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Copyright © 1984 by the American Society of Plant Biologists