Foliar anatomy with emphasis in the secretory trichomes and chromatographic analysis of the essential oil of Melissa officinalis L. (Lamiaceae)
DOI:
https://doi.org/10.70151/yb0pd215Keywords:
Melissa officinalis, secretory trichomes, foliar anatomy, monoterpenes, volatile oilsAbstract
Adult leaves of Melissa officinalis L. (Lamiaceae) harvested during the time of budding had been used in the study of the leaf anatomy in the identification of the secretory structures. The material was fixed in FAA 50%, dehydrated in alcoholic series (ethyl), infiltrated in paraffin, sectioned at 13 mm, staining and later analyzed through optic microscopy. Also it was carried through a study in gaseous chromatography for attainment of the crude essential oil. Analyses of transversal sections of the leaf of Melissa officinalis, has identified the presence of two types of secretory trichomes: peltate and capitate, beyond the presence of trichome tector. Trichome capitate, identified in literature as (type 1), presents variations in its morphology in relation to the cells number stalk and the head secretory cells number. The chromatographic analysis of the essential oil identified the presence of monoterpenes, in two major components, responsible for more than 87.8% of the relative composition in the crude oil, beyond sesquiterpenes in smaller proportions.
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