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Effects of Ozone on Soybean Nodules¹

ABSTRACT

Soybeans [Glycine max (L.) Merr.] were exposed to ozone determine if plant growth and nodulation would be reduced The plants were 3 weeks old from seed when exposed to 75 pphm ozone for 1 hour and were harvested at weekly intervals starting 4 days after exposure. The ozone treatment caused only a transitor reduction in top fresh weight. However, nodule number, nodule weight per plant, leghemoglobin content, and root growth were consistently reduced by the ozone treatment. The reductions in nodule weight per plant and leghemoglobin content per plant were directly correlated with the reduction in nodule number.

Key Words: air pollution • plant growth

¹ Cooperative investigations of the Environmental Protection Agency, North Carolina State University, and the U. S. Department of Agriculture, Raleigh, N. C. Paper no. 3599 of the Journal Series of the North Caorlina State Univ. Agr. Exp. Sta., Raleigh, N. C.

² Botanist, Environmental Protection Agency, National Ecological Research Laboratory, Corvallis, Oreg. 97330; and Assistant Professor of Botany, respectively, North Carolina State University, Raleigh, N. C. 27607.

Received for publication August 10, 1972.