The Effect of 2-Chloro-4-ethylamino-6-isopropyl-amino-s-triazine (Atrazine) on Distribution of 14C-Compounds Following 14CO2 Fixation in Excised Kidney Bean Leaves

Excised leaves of kidney bean plants treated with various concentrationsof atrazine for different periods were allowed to fix ¹⁴CO₂CO₂ fixation was inhibited by atrazine. The ¹⁴C-labelling patternof atrazine-treated leaves resembled dark Co₂-fixation patterns.The carbon-I-carboxyl group of ¹⁴C-aspartic acid from atrazine-treatedand ‘dark’ leaves showed no significant differencesin total radioactivity. Although atrazine disrupted the photosyntheticapparatus, it seemed to have no effect on non-photosyntheticCO₂ fixation.