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Radioactive sucrose-C14 and serine-C14 were “fed” to excised leaves from red kidney bean plants at various times following atrazine treatment. The distribution of C14 in the various labeled compounds was determined by two-dimensional paper chromatography and subsequent elution and counting. The results indicated that other processes entirely independent of the photosynthetic block are also involved in the herbicidal action. Atrazine did not affect the rate of respiration of excised embryos of red kidney bean plants.
Monuron [3–(p–chlorophenyl)–1,1–dimethylurea] is reported to be a potent inhibitor of the Hill reaction by Cooke and Wessels and van der Veen. It is reported to be 125 times as active as phenylurethan [ethyl–N–phenylcarbamate] in inhibiting the Hill reaction. Diuron [3–(3,4–dichlorophenyl)–1,1–dimethylurea] is 2500 times as active as phenylurethan as a Hill reaction inhibitor. Monuron and diuron have been used in photosynthetic studies. There are no reports in the literature indicating a difference in the mode of action of these compounds.
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