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Anatomia foliar de quatro espécies do gênero Cattleya Lindl. (Orchidaceae) do Planalto Central Brasileiro Foliar anatomy of four species of genus Cattleya Lindl. (Orchidaceae) of the Brazilian Central Planalt

By Rosane Zanenga-Godoy and Cecilia Gonçalves Costa

Abstract

As espécies analisadas (Cattleya araguaiensis Pabst, C. bicolor Lindl., C. nobilior Rchb. e C. walkeriana Gardn.) apresentam epiderme uniestratificada em ambas as faces da lâmina foliar, ocorrendo estômatos na face abaxial; deposição de cera epicuticular em crostas, escamas, flocos e plaquetas; em C. araguaiensis ocorrem estegmatas incrustados nas células epidérmicas; em todas as espécies ocorre hipoderme com células de paredes espessadas; mesofilo bifacial, compacto; células paliçádicas atípicas, com barras de espessamento; feixes vasculares colaterais dispostos alternadamente, acompanhados por bainha de fibras; cordões fibrosos acompanhados por estegmatas ocorrem longitudinalmente na lâmina foliar; presença de ráfides. Os aspectos descritos revelam acentuada xeromorfia, em função de economia de água.<br>The analyzed species (Cattleya araguaiensis Pabst, C. bicolor Lindl., C. nobilior Rchb. e C. walkeriana Gardn.) present unistratified epidermis at both surfaces with stomata at abaxial surface; deposition of epicuticular wax in crusts, scales, granules and plates; C. araguaiensis presents stegmata at epidermal cells; others characteristics present at all species are: hypodermis cells with thick walls; bifacial and compact mesophyll; atipic cells ofpalisade parenchyma with thichness bars; collateral vascular bundles alternate accompanied by sheath fibers; cordon fibers accompanied by stegmata in the foliar blade; raphids. The described aspects reveal accentuate xeromorphy for water economy

Topics: Orchidaceae, Cattleya, anatomia foliar, epifitismo, Orchidaceae, Cattleya, leaf anatomy, epiphytism, Botany, QK1-989, Science, Q, DOAJ:Botany, DOAJ:Biology, DOAJ:Biology and Life Sciences
Publisher: Sociedade Botânica do Brasil
Year: 2003
DOI identifier: 10.1590/S0102-33062003000100008
OAI identifier: oai:doaj.org/article:10cf6d1620a44b59a09fbe3a148f6028
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