The Effect of 2-Chloro-4-ethylamino-6-isopropyl-amino-s-triazine (Atrazine) on Distribution of14C-Compounds Following14CO2Fixation in Excised Kidney Bean Leaves

Abstract

Excised leaves of kidney bean plants treated with various concentrations of atrazine for different periods were allowed to fix ¹⁴CO₂ CO₂ fixation was inhibited by atrazine. The ¹⁴C-labelling pattern of atrazine-treated leaves resembled dark Co₂-fixation patterns. The carbon-I-carboxyl group of ¹⁴C-aspartic acid from atrazine-treated and ‘dark’ leaves showed no significant differences in total radioactivity. Although atrazine disrupted the photosynthetic apparatus, it seemed to have no effect on non-photosynthetic CO₂ fixation.