Changes in the essential oil profile of rose-scented geranium during development were determined gas chromatographically. It was found that the essential oil yield (1.56%) and geraniol content (34.6%) were highest in the first leaf, while in the twelfth leaf they were 0.05% and 13.9% respectively. Similarly essential oil gland density was found to be highest in the first leaf after which it decreased. The other major oil constituents such as isomenthone, citronellyl formate, geranyl formate and citronellol were not influenced by leaf age. Some changes occurred in the linalool content during leaf aging although no clear trend was evident.
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Rao et al. (1993) studied this question.
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