Anatomia foliar de Annona glabra L. (Annonaceae) ocorrente na ilha de Algodoal-PA

Abstract

The sandbank of Algodoal/Maiandeua, an Environmental Protection Area (APA) located in the municipality of Maracanã-PA, presents a considerable floristic diversity, according to surveys conducted in this area. Two species of the Annonaceae family have been registered, Annona paludosa AubleAnnona glaba L. Of these, we selected A. 32 glaba L., with the objective of knowing its leaf anatomy. For this work, we used the usual laboratory techniques in anatomy. On the adaxial surface in frontal view, thin-walled epidermal cells are observed, covered by a granular cuticle; with bases of trichomes dispersed in the leaf lamina. In the abaxial epidermis, the epidermal cells are slightly sinuous, heterodimensional with an ornamented cuticle; still on this surface we verify the presence of papillae, oil cell, simple, flattened, non-glandular trichomes and paracitic type stomas. The mesophyll is dorsiventral formed by palisade and lacunate parenchyma. The palisade parenchyma is composed of cells organized in palisade, uniform, followed by a lacunose parenchyma, there is an irregular adaxial hypodermis. The petiole in cross section shows three distinct regions: lining, cortical and vascular. The cortical region is filled with a parenchyma of rounded and heterodimensional cells; in the innermost region there are three groups of collateral vascular bundles. The presence of sclerenchyma fibers is observed, protecting the vascular bundles at the phloem level. Comparing the results obtained in this work with those described by Metcalf (1957), we verified that there are anatomical characteristics common to the Annonaceae family, but A. glaba L. also presents characteristics specific to the taxon.