Leaf morphoanatomy and chemical composition of seven Melaleuca L. (Myrtaceae) species / Morfoanatomia foliar e composição química dos óleos essenciais de sete espécies de Melaleuca L. (Myrtaceae)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Results on the compared leaf anatomy, chemical composition and histolocalization of the essential oils of the species of Melaleuca L. growing in the municipal district of Viçosa, state of Minas Gerais - Brazil. The various Melaleuca species showed differences within their relative essential oil composition. Each of the oils analyzed revealed a dominant component: terpinen-4-ol (53.7%) for M. alternifolia, 1,8-cineole for M. armillaris (80.2%), M. ericifolia (79.5%), M. cajuputi Roxb subspecies cajuputi (43.7%), and M. cajuputi Roxb subspecies platyphylla (41.0%). M. quinquenervia and M. leucadendra presented chemotypes with volatile oils rich in viridiflorol (71.0%) and methyleugenol (96.6%), respectively. The morphologic and anatomical evaluation of the seven species of Melaleuca revealed the presence of universal elements of the family Myrtaceae. Xeromorphyc features were identified in all the species as well as the presence of similar structures the lenticels in the species peciolateds. The histolocalization studies revealed to be the secretors cavities the production site and accumulation of the essential oils. It was also evidenced the presence of fenolic compounds in the cells of the spongy parenchyma and of the epithelium secretor of the channels, indicating be these probable production sites and accumulation of these composed.

ASSUNTO(S)

Óleos essenciais morfo-anatomia foliar histolocalização botanica melaleuca histolocalization melaleuca essential oils leaf morphoanatomy

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