Abstract
Abstract The chemical composition of volatile compounds in leaves of Mandevilla guanabarica from three restingas in Rio de Janeiro was characterized by GC/MS after SDE. The volatiles common were 3-hexen-1-ol, β-caryophyllene and germacrene D, which were majority compounds for plants from Grumari, Jurubatiba and Marica, respectively. M. guanabarica also contained other compounds: α-cubebene, α-copaene and cubebene (Grumari); β-ocimene, α-caryophyllene and germacrene B (Jurubatiba); and β-elemene and alloaromadendrene (Marica). Although some compounds were common to all locations, the qualitative and quantitative chemical profiles of volatile compounds of M. guanabarica from three different areas in the same season, with similar conditions of temperature and precipitation, were distinct. Leaf histochemical analysis revealed the presence of fatty acids in idioblasts, and rubber grains and droplets of lipophilic substances in the mesophyll, for all three samples. These results indicate the possible influence of physiological variations and/or environmental conditions on the composition of volatiles in M. guanabarica .
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