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Published in Crop Sci 11:844-848 (1971)
© 1971 Crop Science Society of America
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Effect of Atrazine on Physiological Processes in Leaves1

Simeon K. Imbamba and Dale N. Moss2

We fed 2-chloro-4-(ethylamino)-6-(isopropylamino-s-triazine (atrazine) through the base of excised leaves of atrazine-tolerant and -susceptible species. Atrazine suppressed CO2 uptake in all species. This was shown to be due primarily to inhibition of the photosynthetic reactions and only to a slight extent to the stomatal closure caused by atrazine. Atrazine did not cause stomatal closure in CO2-free air. Atrazine inhibited photorespiration but did not inhibit oxidation of externally supplied glycolate. It had no effect on dark respiration.

Key Words: Photosynthesis • Respiration • Photorespiration • Stomatal diffusive resistance

1 A contribution of the Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minn. 55101. Minnesota Agr. Exp. Sta. Journal Series Paper No. 7607.

2 Former Graduate Assistant (Presently, Lecturer, Department of Botany, University of Nairobi, Kenya), and Professor, respectively.

Received for publication April 3, 1971.




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