و گلايفوسيت نشاندارشده با كربن 41 براي انتقال به ريشه گياه شيرين بيان طي مراحل رويش و رشد آن 2,4-D تعيين مناسبترين زمان كاربرد علف كشهاي

Determination of the Best Application Time of 2,4-D 14C-Labelled Herbicides and 14C-Labelled Glyphosate for Translocation to the Root System of Glycyrrhiza Glabra at Vegetative Growth Stage

In this research work, four different growth stages of Glycyrrhiza glabra were studied separatly and under green house conditions, and in all of these stages the plants were treated by labelled herbicides ^C-2,4-D and 14C-Glyphosate through the adaxial surface With activity of 0.60 uci upto 0.1018 uci (in each 10 uli of solution). The plants were harvested 72 hours after treatment. They were divided into treated leaf, leaves and stem above the treated leaf and leaves and stem below the treated leaf and root. The amount of radio labeled herbicides in each homogenous solution (Produced from extraction of herbicides from plant samples) was quantified using liquid scintillation counter. The amount of herbicide mobility and transfer to different parts of Glycyrrhiza glabra in each growth stage were determined. This study shows that the best application time of 2,4-D for translocation to the root system of the plant is at 6- leaf stage, and 2,4-D indicates more translocability as compared with Glyphosate.