The preferential accumulation of picloram at sites of active growth in gorse (Ulex europaeus L.) |
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| Authors: | ROGER J FIELD PHUNG HONG HAI |
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| Institution: | Department of Plant Science, Lincoln College, Canterbury, New Zealand |
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| Abstract: | Application of 14C-picloram to single spines of 6 month old, soil grown, vegetative plants of gorse (Ulex europaeus L.) resulted in its translocation to regions of meristematic and metabolic activity, with significant accumulation in the stem apex and root nodules. Dissection of the root system of plants grown in nutrient solution revealed a greater mass of picloram in differentiated root tissue than in root apices, although the concentration of chemical in the latter fraction was greater than in the former. Loss of picloram to the nutrient solution was interpreted as preferential leakage from the root nodules because of the lack of picloram accumulation in this fraction. In reproductive plants bearing flowers and floral buds the picloram was diverted from the root tissue fractions to the floral organs, which constituted the primary sink. |
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