Journal of the Brazilian Chemical Society
On-line version ISSN 1678-4790
DUARTE, Alessandra R. et al. Seasonal Influence on the Essential Oil Variability of Eugenia dysenterica. J. Braz. Chem. Soc. [online]. 2009, vol.20, n.5, pp. 967-974. ISSN 1678-4790. http://dx.doi.org/10.1590/S0103-50532009000500023.
The chemical composition of the essential oils of cultivated Eugenia dysenterica populations, which originated from seeds obtained from two different sites and harvested during summer and winter, have indicated the presence of two oil clusters related to seed origin and season. Cluster I included only samples which originated from seeds from Senador Canedo (SC) collected during winter (subcluster IA) and with high percentages of β-pinene (6.6-14%), α-pinene (5.9-13%), and (Z)-β-ocimene (0-13%), or samples collected mainly in the summer (subcluster IB) and characterized by high contents of γ-cadinene (0-33%), limonene (1.2-28%), and β-pinene (3.2-23%). Cluster II included all the samples cultivated from seeds originating from Campo Alegre de Goiás (CA) regardless of the season, which were characterized by high amounts of β-caryophyllene (15-74%), δ-cadinene (0-24%), and α-copaene (0-14%). The canonical correlation between populations and seasons revealed that α-pinene, (Z)-β-ocimene, (E)-β-ocimene, and γ-cadinene present a strong correlation with the cold and dry winter (subcluster IA), whereas β-caryophyllene, temperature, and precipitation were related to samples from CA seed origin during the hot and humid summer (cluster II). Sesquiterpene hydrocarbons predominated in all the sampled populations and the observed essential oil chemovariation might be genetically determined by seed origin, in addition to a clear seasonal influence shown only in the samples from SC seeds.
Keywords : Eugenia dysenterica; Myrtaceae; essential oil; chemical variability; multivariate analysis; seasonal influence.