Abstract
AbstractMorphactin ester applied as a bark band to stems of Monterey pine seedlings (Pinus radiata D. Don) at first stimulated and then inhibited the rate of stem elongation over a 20‐day period. The inhibition was caused by a direct action of morphactin on the shoot rather than by indirect action on the root system. 14C labelled morphactin applied to the bark accumulated in the shoot apices and the amount accumulated could be related to the inhibition of growth. More than 70% of labelled material isolated from roots and shoot apices was in the form of a metabolite similar to the carboxylic acid derivative of the morphactin ester. A preparation of 14C labelled acid derivative applied to the bark was translocated to the shoot apex and to the roots and inhibited stem elongation.
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