Article

Anatomia de raiz, caule e folha e identificação de estruturas secretoras de Achillea millefolium L. (Asteraceae)

Acta Scientiarum Biological Sciences 01/2006; 28(4):327-334. DOI: 10.4025/actascibiolsci.v28i4.163

ABSTRACT An anatomic study of the vegetative organs: root, stem and leaf was made. The essential oils were extracted from the plant identifying the possible secretory structures. Fresh material was used in order to perform histochemical tests and to prepare semi-permanent slides, which were colored with Safrabau. For the preparation of the semi-permanent slides, material fixed in FAA 50% was used including historesina. Tector hairs can be observed in the scape and flower. Secretory channels of schizogeneous origin follow the vascular bundles in the rhizome, scape, leaf and bract of the flower. In the root, these channels are absent. In the leaf and in the unopened inflorescence there is a greater quantity of the essential oils. The leaf is amphistomatic and the stomata of anomocytic type are present in the scape as well. The general structure of the Achillea millefolium is similar to the structures of the other species of Asteraceae family.

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    ABSTRACT: The composition of the essential oils from leaves and from flowers of Achillea millefolium L. ssp. millefolium was analysed by GC and GC-MS. During the flowering period of the plant, both oils consisted mainly of monoterpenes (about 80%). 1,8-Cineole was the dominant component in the oils from the flowers (29%) and from the leaves (25%), while sabinene was the second most important component in the oil from the flowers (15%) and trans-sabinene hydrate in that from the leaves (10%). The sesquiterpene fraction was in both cases dominated by germacrene-D (0.7% in the oil of the flowers and 7% in the leaf oil).In the essential oil isolated from leaves collected during the vegetative phase, the monoterpene fraction was small (<3%), whereas sesquiterpenes amounted to 92%, germacrene-D being the major component (65%) of the oil.
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