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Short-Term Kinetic Studies on the Inhibition of Photosynthesis by Sulfur Dioxide¹

ABSTRACT

Utilizing infrared gas analysis techniques, the effect of a 1-hour exposure to 1, 3, or 5 ppm SO₂ on apparent photosynthesis in the primary leaf of Pinto bean (Phaseolus vulgaris L. cv. Pinto) was studied as a function of three leaf ages. Generally, photosynthesis was reduced about 15, 70, and 90% for the respective concentrations regardless of leaf age. The initial inhibition of photosynthesis was not due to stomatal closure. Inhibition kinetics observed at 1 and 3 ppm SO₂ for Pinto bean (Phaseolus vulgaris L.) were compared with those of SO₂-tolerant corn (Zea mays L.). At 1 ppm SO₂, the kinetics of inhibition of photosynthesis for the two species were similar; however, at 3 ppm SO₂, apparent photosynthesis in corn was inhibited less than in Pinto bean and recovered to a higher level following removal of SO₂.

Key Words: Phaseolus vulgaris L. • Zea mays L. • air pollution • carbon dioxide exchange

¹ Contribution from the Department of Botany, The Ohio State Univ., Columbus. Paper 849. This work was completed while the senior author was a CIC Fellow in Biometerology, supported by Graduate Training Grant 2T1AP16 from the National Air Pollution Control Administration, U.S.P.H.S.

² Assistant Professor, Texas A&M Univ. Agr. Res. and Ext. Center, Route 5, Box 784, Beaumont, Texas 77706, and Professor, Department of Botany, 1735 Neil Ave., Ohio State Univ., Columbus 43210.

Received for publication April 20, 1973.