Studies on the Biosynthetic Origin of the Acyl Side Chains of Dryopteris Fern Constituents

Abstract

Evidences based on feeding experiments and electron microscopic studies are presented to support the hypothesis that methylation is involved in the biosynthetic formation of the higher acyl side chains in the Dryopteris phloroglucinol derivatives.

Electron Microscopic Investigations on Internal Glandular Hairs of Dryopteris Ferns

“…The present series of electron microscopic investigations is thought to be first on Dryopteris glands, although some of our results have been discussed in a report on the biosynhesis of Dryopteris phloroglucinols [32].…”

“…It is now accepted that, in agreement w i t h the early findings of SCHACHT [24], the excrete constituents are biosynthesized in the glandular cytoplast [c. f. also 311. Dryopteris rhizomes, being extremely slow-growing, present practical difficulties for studies on p h l~r o~l u c i n o l biosynthesis using radioactive tracers [32]. Even using unphy~iolo~ic direct injection of the tracer solution into the rhizome, tracer incorporation in phloroglucinols remains low [33].…”