Barban の選択殺草機構 : 吸収, 移行および化学形態変化について A Mechanism on Selectivity of Barban : Absorption, Translocation and Chemical Transformation

barbanの選択殺草機構を解明するために, barbanの吸収, 移行および化学形態変化について検討した.移行および化学形態変化の速度においては, 感受性植物(エンバク), 抵抗性植物(コムギ)の間に大きな差は認められなかった.茎葉によるbarbanの吸収を, intact shootsとsectioned shootsについて調べてみた, intact shootsの場合には, 感受性植物のほうが著しく多く吸収することが認められ, その際, 殺草点と思われるタンパク・核酸生合成系の阻害もきわめて大であった.これに対して, sectioned shootsの場合には, 吸収, およびタンパク生合成能の抑制ともに, 両植物間に差は認められなかった.したがって, barbanの選択殺草性の主因の一つとして, 茎葉による吸収速度の差が挙げられる.

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.