BENTAZON INFLUENCE ON SELECTED METABOLIC PROCESSES OF ISOLATED BEAN LEAF-CELLS

Time- and concentration-course studies were conducted to determine the effect of bentazon [3-isopropyl-1H-2, 1, 3-benzothiadiazin-4(3H)-one 2,2-dioxide] on photosynthesis, RNA synthesis, protein synthesis and lipid synthesis using enzymatically isolated leaf cells of red kidney bean. Photosynthesis and RNA synthesis were inhibited .apprx. 75% at 1 .mu.M bentazon at the 30 min treatment period. This was the lowest concentration and shortest time that significantly inhibited any of these 4 processes. The degree of inhibition of photosynthesis was greater than the degree of inhibition of RNA synthesis at higher concentrations and/or longer time periods. At 10 .mu.M bentazon, protein synthesis and lipid synthesis were also inhibited. Lipid synthesis was stimulated at 0.1 and 1 .mu.M at 120 min.