Resumo -O objetivo deste trabalho foi caracterizar a anatomia foliar de Ananas comosus var. erectifolius e comparar as características anatômicas de suas fibras foliares, quando submetidas a dois índices de radiação fotossinteticamente ativa (54 e 100%). Para a análise das estruturas anatômicas, especialmente as fibras, foram utilizadas técnicas de dissociação da epiderme foliar, contagem do número de estômatos por milímetro quadrado, cortes histológicos e microscopia eletrônica de varredura no material botânico fixado. A epiderme estava revestida por cutícula espessa e bem desenvolvida nas folhas nos dois índices de radiação. Nas folhas a 100% de radiação fotossinteticamente ativa, foi observado aumento de espessura nas regiões apical e basal. Foram observadas diferenças no número de camadas e altura do parênquima paliçádico e na quantidade de feixes fibrosos relativas aos índices de radiação. A quantidade de feixes fibrosos foi maior na condição de 54% do que em 100% de radiação fotossinteticamente ativa.Termos para indexação: Ananas comosus, anatomia vegetal, Bromeliaceae, fibra vegetal. Leaf structure of curaua in different intensities of photosynthetically active radiationAbstract -The aim of this work was to characterize the leaf anatomy of Ananas comosus var. erectifolius and to compare the anatomical characterists of its leaf fibres, when submitted to two levels of photosynthetically active radiation (54 and 100%). For the analysis of the anatomical structures, specially the fibres, the settled botanical material was submitted to techniques of dissociation of the foliar epidermis, microscopic number of stomata per square millimeter, cuts and scanning electron microscopy. The epidermis was coated for thick cuticle and developed well in leaves in the two intensity indexes of radiation. For leaves at 100% PAR a fast increase of thickness was observed in the apical and basal regions. Regarding the radiation levels, differences were observed in the number of layers, the height of palisade parenchyma, and in the amount of fibre beams. The amount of fibre beams was bigger at 54% than at 100% PAR.
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