Abstract
To explore diversity in the morphological features, essential oil yield, and chemical composition of Ocimum taxa growing in foot and mid-hills of northern India; 34 populations representing five Ocimum species were collected and investigated. Essential oil yield (%v/w) was found to vary from 0.10 to 0.74% in different populations. Analyses of the essential oils by GC/FID and GC/MS and the subsequent classification by statistical analysis resulted in seven clusters with significant variations in their terpenoid compositions (cluster I: methyl chavicol/linalool; cluster II: eugenol/(Z)-β-ocimene/β-elemene/(E)-caryophyllene; cluster III: camphor/limonene; cluster IV: eugenol/(E)-caryophyllene/β-bisabolene/β-elemene/methyl chavicol/1,8-cineole; cluster V: linalool; cluster VI: methyl eugenol/(E)-caryophyllene/β-elemene; and cluster VII: citral/nerol/geraniol type). Comparison of present results with earlier reports revealed the existence of four new chemotypes in Ocimum taxa from this region.
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