Geraniol dehydrogenase, the specific enzyme involved in geraniol to ci
tral trans (geranial) transformation, activity was monitored in variou
s lemon-grass cultivars differing in amounts and relative percentages
of citral and geraniol in their essential oils. The enzyme activity ha
d a positive and significant association with citral to geraniol, and
geranial to geraniol ratios. The results are suggestive of a strong re
lationship between the enzyme activity and essential oil quality in le
mongrass cultivars.