Abstract
Callus and suspension cultures of Rosa damascena maintained under ranges of conditions that were predicted on the basis of current hypotheses to favour secondary metabolism accumulated negligible amounts of monoterpenes. However, enzymes that converted mevalonate and isopentenyl pyrophosphate into geraniol and nerol could be extracted from the apparently inactive callus with activities up to 100-fold greater than those from the parent plant, and these activities were optimum in cultures that were slow growing or were in the stationary phase. Callus and suspension cultures both rapidly metabolized exogenously supplied monoterpenes via oxidative pathways. Thus nonaccumulation may be due to degradation of nascent products formed endogenously. Similar results were obtained from less detailed studies on R. gallica, R. canina and R. cv. Paul's Scarlet.
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