Abstract
Label from 14CO2 and [2-14C]mevalonic acid was incorporated into resin components of Newcastelia viscida. About 25% of the label from [2-14C]MVA was incorporated into resin components after 4 h. Approximately 80% of the label in the resin was in a TLC band coinciding with the major terpenoid components, with 60% associated with the major tricyclic diterpene, a pimaradiene which contributes 15% to the leaf resin dry weight. Experiments with detached trichomes showed about 0·01% incorporation of label from [2-14C]MVA into pimaradiene, with most of the [abel being associated with β-sitosterol. It is proposed that the glandular hairs are the sites of terpene resin synthesis, as well as secretion, in this species.
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