Diversity on Diterpene Composition in Two Populations of Parentucellia viscosa : Labdane and Clerodane Chemotypes

Abstract

The terpenic compositions of two populations of Parentucellia viscosa growing in the west-central and southern parts of the Iberian Peninsula have been studied. Seven labdadienes were identified from the former population, whereas the main terpenic constituents of the latter were ent-clerodadienes. The biosynthetic significance of this dramatic change in the diterpenic distribution of both populations is discussed.