几种有机硅助剂对草甘膦在单子叶植物体内吸收、转移和分布的影响

采用14C-草甘膦同位素标记法研究了4种有机硅助剂Silwet L-77、Silwet 800 、Freeway 和Boost 在体积分数0.1%用量下对草甘膦在黑麦草( Lolium perenne L. cv. Grasslands Greenstone)体内吸收、转移和分布的影响。结果表明:与单用草甘膦相比，4 种助剂的加入显著地降低了草甘膦在黑麦草体内的吸收和转移量，助剂之间无显著性差异。 处理后24和72 h测定，草甘膦主要分布在幼嫩组织中，其次是根部，在老叶片中的转移量最 少。无论转移量高低，草甘膦在植物体内的分布总是表现为地上部的比例高于地下部。有机 硅助剂对草甘膦在各组织中的分布比例没有影响。

Influence of Organosilicone Surfactants on Uptake, Translocation and Distribution of Glyphosate on Perennial Ryegrass ( Lolium perenne L.)

Radiolabelled glyphosate was used to investigate the effects of organosilicone s urfactants Silwet L-77, Silwet 800, Freeway and Boost on the foliar uptake, tra nslocation and distribution of the formulated glyphosate Roundup? in perennial ryegrass ( Lolium perenne L cv. Grasslan ds Greenstone) over a 72 h time-course. Results indicated that addition of orga nosilicone surfactants significantly decreased the amount of uptake and transloc ation of glyphosate into ryegrass 24 and 72 h after treatment. Four organosilico ne surfactants showed similar antagonism of foliar uptake. The amount of glyphos ate translocation varied according to plant parts, the highest one was in young tissues, and the least one was in leaf 1. Distribution of glyphosate with or wit hout organosilicone surfactants to shoots was much higher than that of to roots 24 and 72 h after treatment. Addition of organosilicone surfactants had no effec t on the distribution rate to shoots and roots.