【摘要】 丙酯草醚(ZJ0273)是我国创制的一种新型高效油菜田除草剂。本文以[C环-U-14C]-ZJ0273为示踪剂,在实验室条件下,对丙酯草醚在敏感性植物水稻和耐性植物油菜中的吸收、运转及分布规律进行了研究。结果表明:(1)施药后,水稻和油菜对丙酯草醚的吸收量总体呈随时间增加而增加的趋势,且前者大于后者。至384h,水稻对丙酯草醚的吸收量为24.1%,而油菜仅为4.1%,水稻约为油菜的5.88倍。(2)丙酯草醚被油菜和水稻根系吸收后,均主要分布在根部,不易向上运转。水稻根系与地上部(茎叶)的放射性分布比为7.10∶1,油菜则为4.44∶1;水稻和油菜根系中单位质量放射性活度分别是各自地上部的10.36和9.85倍。(3)水稻根系和茎叶单位质量放射性活度分别为9.470 Bq/mg和0.910 Bq/mg,显著高于油菜的3.870 Bq/mg和0.390 Bq/mg。水稻与油菜对丙酯草醚吸收量以及单位质量中积累量的差异可能是丙酯草醚对两者存在选择性的原因之一。更多还原

【Abstract】 ZJ0273,propyl 4-（2-（4,6-dimethoxypyrimidin-2-yloxy）benzylamino）benzoate,is a novel ALS-inhibited herbicide development for pre-and post-emergence weed control in field of oilseed rape.The comparative uptake,translocation and distribution of root-applied [C ring-U- ¹⁴C]-ZJ0273 in the plants of susceptible rice and tolerant oilseed rape were investigated under laboratory conditions.The results showed that the uptake of [C ring-U- ¹⁴C]-ZJ0273 in both rice（Oryza sativa L.） and oilseed rape（Brassica napus L.） increased with time.Larger percentage of the applied ZJ0273 was uptaken by rice than oilseed rape at any sampling time.At 384 hours after treatment,the uptake of [C ring-U- ¹⁴C]-ZJ0273 reached 24.1% of the applied amount in rice,while only 4.1% of the applied in oilseed rape.The majority of the absorbed ZJ0273 remained in the root of the tested plants,which indicated the weak mobility of ZJ0273 and/or its metabolites in both the plants of susceptible rice and tolerant oilseed rape.The radioactivity per unit of dry weight in the roots and leaves of rice was 9.470 Bq/mg and 0.910 Bq/mg,respectively,which was significantly higher than that in oilseed rape（3.870 Bq/mg and 0.390 Bq/mg）.Therefore,the difference in the total uptake of ZJ0273 and the accumulation of ZJ0273 and/or its metabolites perunit of dry weight between rice and oilseed rape,which revealed in this study,might be one of the reasons for the different susceptibility of rice and oilseed rape on ZJ0273.更多还原