Absorption, translocation and metabolism of the herbicide naproanilidein tobacco

摘要

AbstractNaproanilide 2‐(2‐naphthyloxy)propionanilide has a high activity against dicotyledonous weeds in rice fields, but is very safe to rice. This study was designed to clarify the absorption and translocation of radiolabelled naproanilide in tobacco plants and the metabolism in tobacco callus. The results indicated that naproanilide is translocated easily to the upper part of tobacco plants. Distribution of radioactivity in tobacco plants at the 7th day was shown to be 0.88, 0.24 and 0.03, and at the 14th day 1.71, 1.86 and 2.32 of the total activities of 14Cnaproanilide in root, stem and leaf, respectively. When compared to earlier results obtained with rice, the translocation rate in tobacco is much higher and might therefore contribute a possible mechanism of herbicidal selectivity. Metabolites including NOP 2‐(2‐naphthyloxy)propionic acid, NOPM methyl 2‐(2‐naphthyloxy)propionate, 2‐naphthol, 2,3‐naphthalenediol, 2,6‐naphthalenediol, 2,7‐naphthalenediol and 2‐hydroxy‐1,4‐naphthoquinone were identified in tobacco ca