Analise morfológica dos órgãos vegetativos e anatomia foliar de piper alatipetiolatum yunck (piperaceae)

Abstract

Piper alatipetiolatum Yunck., is a representative within the Piperaceae family, commonly known as Pau d'angola, widely used as an aromatic plant. Due to little information about the morphology and structural organization of the vegetative organs of the above mentioned species, it was proposed in this work to give information about its morphology and anatomy. The botanical samples were collected in the city of Ananindeua (PA), herborized and deposited in the herbarium (MG: 174254), and part of the samples were assigned to the morphological and anatomical study of the species. Morphologically, Piper alatipetiolatum Yunck. is a shrub up to 2m tall, green, cylindrical stem, presenting nodes and internodes with lenticels, simple, alternate, petiolate leaves, green, cylindrical branches, with nodes, spike-like inflorescence. Anatomically, on the adaxial and abaxial surface, the cells present irregular shapes, straight anticline walls and smooth cuticle, on the nervures they are rectangular and elongated. On the abaxial surface there are tetracyclic stomas, glandular trichomes throughout the surface and only tectors trichomes on the veins and margins, and pearly cells near the central vein. On the adaxial surface, at the Scanning Electron Microscopy (SEM) level, cells with ruptures, probably related to the release of oils, and few secretory trichomes were observed. In the mesophyll region the upper and lower epidermis are similar, there is one layer of palisade parenchyma and three layers of lacunose parenchyma interrupted by oleiferous idioblasts. In the central vein there are three collateral bundles. With the results obtained it was possible to identify that in Piper alatipetiolatum Yunck. the organ that eliminates aroma is the leaves, due to the presence of secretory structures.