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Ozone Injury to Soybean Cotyledonary Leaves¹

ABSTRACT

Ozone effects stomatal closure, but injury to the palisade cells in soybean (Glycine max L.) cotyledons also occurs. The visible and anatomical injury resembles that on other leaves. Cotyledons and primary leaves were most sensitive to ozone 6 to 7 and 13 to 14 days after seeding, respectively. The upper epidermis and 3 to 4 layers of palisade cells can be easily separated from the remaining tissue, thereby providing a good source of plant material to study the uptake, translocation, and metabolism of phytotoxicants and to study the chemical nature of air pollution injury to stomata and to palisade cells. Extent of injury on cotyledons and primary leaves of each variety was similar; thus, the use of cotyledons to study the relative sensitivity of plant varieties to ozone is proposed.

Key Words: cotyledonary injury • air pollution • maximum sensitivity

¹ This project is supported in part by funds from the Division of Economic Effects Research, Air Pollution Control Office, Environmental Protection Agency, US Department of Health, Education, and Welfare.

² Plant Pathologist and Plant Pathologist (Research Assistant), respectively, Plant Science Research Division, ARS, USDA, Beltsville, Md. 20705.

Mention of a trademark name or a proprietary product does not constitute a guarantee or warranty of the product by the USDA, and does not imply its approval to the exclusion of other products that may also be suitable.

Received for publication March 24, 1971.