Variation in leaf essential oil content from different clones of Eucalyptus.
The objective of this study was to determine the leaf essential oil content from 9 clones of Eucalyptus. Leaf samples were harvested from Lao Khwan and Nong Prue District, Kanchanaburi Province in March 2013. The leaves were dried in airy premises and shielded from the light for 3-5 days. Moisture content of each sample was also determined. The essential oil was extracted by hydrodistillation. Result showed that the average moisture content of dried leaves ranged from 6.26-8.60%. The essential oil of 9 clones were significantly different (P<0.05) and varying from 0.54-2.37% (v/w dry weight). Among 9 clones, S2 (E. camaldulensis) had the highest average percentage of essential oil, followed by K83 (E. camaldulensis × E. pellita) and S1 (E. camaldulensis × E. pellita), respectively. The lowest one was obtained from K7 (E. camaldulensis × E. deglupta). Result of this study suggested that at least 3 clones of Eucalyptus had potential for essential oil production. However, chemical composition of these essential oils should be considered to confirm their potential.