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Braz. arch. biol. technol ; 53(1): 123-131, Jan.-Feb. 2010. ilus
Article in English | LILACS | ID: lil-543199

ABSTRACT

This work aimed to study the macro and microscopic characters of the aerial vegetative organs of Baccharis usterii for quality control purposes. The plant was prepared for light and scanning electron microscopic analyses. The stem consisted of three-winged cladodes with small leaves. In the caulinar axis, these was a uniseriate epidermis, chlorenchyma alternating with angular collenchyma, perivascular fibre caps adjoining the phloem which was outside the xylem, and parenchymatic pith. The wings and the leaves were alike, presenting a uniseriate epidermis, palisade parenchyma next to the both sides of the epidermis and spongy parenchyma traversed by minor collateral vascular bundles in the central region. In the leaf midrib, a single collateral vascular bundle was embedded in the ground parenchyma. Secretory ducts and glandular trichomes occured in the stem and leaf.


Caracteres macro e microscópicos dos órgãos vegetativos aéreos de carqueja: Baccharis usterii Heering. Este trabalho objetivou estudar os caracteres macro e microscópicos dos órgãos vegetativos aéreos de Baccharis usterii, com aplicação no controle de qualidade. O material botânico foi preparado de acordo com técnicas para microscopia óptica e de varredura. O caule consistiu de cladódios trialados, nos quais se inserem pequenas folhas. O eixo caulinar apresentou epiderme unisseriada, clorênquima em alternância com colênquima angular, calotas de fibras perivasculares apostas ao floema, o qual se forma externamente ao xilema, e medula parenquimática. As alas e as folhas mostraram-se semelhantes, apresentando epiderme unisseriada, parênquima paliçádico junto a ambas as faces epidérmicas e parênquima esponjoso na região central, atravessado por feixes vasculares de pequeno porte. Na nervura central da folha, um feixe vascular colateral encontrou-se mergulhado no parênquima fundamental. Dutos secretores e tricomas glandulares ocorreram no caule e na folha

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