Add time:07/18/2019         Source:sciencedirect.com

Time- and concentration-course studies were conducted to determine the effect of chloro-, methoxy-, and methylthio- substitutions of bis(isopropylamino)-s-triazine on photosynthesis, respiration, RNA synthesis, protein synthesis, and lipid synthesis using isolated leaf cells of Phaseolus vulgaris. Propazine, prometone, and prometryn inhibited photosynthesis, RNA synthesis, and protein synthesis but had little effect on respiration. Lipid synthesis was stimulated at low concentrations and inhibited at high concentrations. The relative inhibition of these three compounds at 100 μM on the four inhibited metabolic processes investigated were: photosynthesis > RNA synthesis ≥ lipid synthesis > protein synthesis. At 10 μM the relative order of inhibition of these processes was similar except, that propazine and prometone stimulated lipid synthesis. At 1 μM photosynthesis and RNA synthesis were inhibited and lipid synthesis stimulated by the three herbicides. The methylthio-substituted compound (prometryn) was more inhibitory to all four inhibited processes than the chloro (propazine)- and methoxy (prometone)-substituted compounds. Propazine and prometone were similar in their inhibitory capacity. The fact that the methylthio-substituted compound was more inhibitory to all four processes suggests that the higher toxicity of prometryn is inherent or has a common basis such as absorption, adsorption, or a common single metabolic reaction. Since the differences observed with these compounds were quantitative rather than qualitative, their mechanism of action appears to be similar.

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