Abstract
Absorption, translocation, and chemical transformation of barban [4-chloro-2-butynyl-N-(3-chlorophenyl) carbamate] in plants were studied in relation to its selective herbicidal action.
Little difference were found in the rates of translocation and chemical transformation between the susceptible (oat: Avena sativa L. ‘Victoria’) and the tolerant (wheat: Triticum aestivum L. ‘Ushio’) plants. However, the rate of absorption of barban by the intact shoots of the susceptible plant was observed to be much higher than by those of the tolerant plant. In contrast to using intact shoots, the rates of barban absorption into the sectioned tissues were found to be almost identical with both susceptible and tolerant plants, in addition that protein synthesis was inhibited by barban to the same extent in both susceptible and tolerant plants.
It is concluded that one of the main factors in determining the selectivity of barban is the differential absorption by intact shoots of both plant species.
