Keywords
Vriesea
leak anatomy
epiphytes
How to Cite
Abstract
The present work aims to extend the knowledge of the genus Vriesea Lindley, contributing data on the foliar anatomy of five species: Vriesea bituminosa Wawra, V. longiscapa Ule, V. triligulata Mez, V. gigantea Gaudich., and V. fosteriana L. B. Sm. Transverse and longitudinal cuts were made manually in fully expanded leaves. The usual histochemical tests were performed. Features typical to the Bromeliaceae were peltate trichomes, single layered epidermis, stomata located only on the abaxial surface of the leaves, a hypodermis with mechanical and water-storing functions, and collateral vascular bundles. Observed differences among the species were number of trichomes in both lamina and sheath, number of cells on the trichome shield, and number of layers of the aquiferous hypodermis. Many of the observed characteristics confirm the xerophytic nature of the leaves. The anatomical organization of the leaves in the studied Bromeliaceae could be related both to environmental pressures as well as to phylogenetic relationships. O presente trabalho tem como objetivo ampliar o conhecimento acerca do gênero Vriesea Lindley fornecendo dados sobre a anatomia foliar de cinco espécies: Vriesea bituminosa Wawra, V. longiscapa Ule, V. triligulata Mez, V. gigantea Gaudich. e V. fosteriana L. B. Sm. O material botânico foi cortado a mão livre. Testes histoquímicos usuais foram realizados. Os resultados mostraram que as espécies exibem as características típicas da família: folhas hipoestomáticas, epiderme simples dotada de tricomas peltados multicelulares, hipoderme com funções mecânica e de reserva de água, tecido clorofiliano diferenciado em paliçádico e esponjoso do tipo braciforme e feixes vasculares colaterais. Foram notadas diferenças entre as especies com relação à quantidade de tricomas ao longo da folha; número de células que compõem o escudo dos tricomas e número de carnadas da hipoderme aquífera. As características observadas confirmam a natureza xerofítica das folhas. A organizaçao anatômica das folhas das Bromeliaceae estudadas pode ser urna resposta a pressões ambientais assim como refletir relações filogenéticas.
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