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.
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Imbamba et al. (1971) studied this question.