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Articles

Stomatal Response and Leaf Injury of Pisum sativum L. with SO₂ and O₃ Exposures ^1,2

II. INFLUENCE OF MOISTURE STRESS AND TIME OF EXPOSURE

Department of Horticulture, University of Wisconsin, Madison, Wisconsin, 53706

Stomatal response during exposure to SO₂ and O₃ and subsequent leaf injury were examined in plants of Pisum sativum L. `Alsweet' grown in a peat-vermiculite medium in controlled environment chambers. Plants developing under moisture stress, induced by drying the medium to 50% of field capacity, exhibited greater stomatal closure during exposures and less than one-fourth the necrosis compared to plants developing in a medium maintained at field capacity. Plants under moisture stress had only a slightly more negative plant water potential (–4.0 bars) than at field capacity (–3.4 bars). Plants exposed to pollutants for 2 hours near the beginning or end of a 16-hour light period had greater stomatal closure during exposures and less leaf necrosis than plants exposed during the middle of the light period.

¹ Contribution from Horticulture Department and Institute for Environmental Studies, University of Wisconsin, Madison, WI 53706. This project has been financed in part by Federal funds from the Environmental Protection Agency under Grant R805971 and by the Wisconsin Public Service Corporation, the Madison Gas and Electric Company, the Wisconsin Power and Light Co., and the College of Agricultural and Life Sciences, University of Wisconsin.

² The contents do not necessarily reflect the views or policies of the Environmental Protection Agency, Department of Horticulture, University of Wisconsin, or the supporting corporations, nor does mention of a trade name for a commercial product constitute endorsement or recommendation for use.