Anatomia e venação foliar de Indigofera microcarpa Desv. (Leg-papilionoideae), ocorrente, na Restinga de Algodoal-Pa

Abstract

The sandbank of Algodoal/Maiandeua Island (APA) is located in the municipality of Maracanã-PA. From surveys carried out in the area, the sandbank presents considerable floristic diversity, with several families and important species, including Indigofera microcarpa, belonging to the Leguminosae family (Papilionoideae). The objective of this work was to study the anatomy of the Ioli of this species, aiming to contribute to the knowledge of the anatomy of Leguminosae. The methodology used was the usual techniques in leaf anatomy. In the frontal view of the leaf lamina, the adaxial and abaxial epidermal cells show heterodimensional cells, slightly wavy anticlinal walls, smooth cuticle and simple, non-glandular, unicellular, braciform trichomes, whose base has cells with thick and lignified walls; the leaf lamina is amphistomatous and the stomas are of the anomocytic and/or anisocytic type. On the abaxial side, papillae and glandular, balloon-shaped trichomes are observed, with a unicellular head with a thin wall, inserted in crypts. The leaflet in cross section, shows isobilateral palisade parenchyma, and between these, the lacunose parenchyma with only one layer of irregular cells, of different sizes and without content. As the cut is directed towards the margin, one notices a reduction of the palisade and lacunate parenchyma and a decrease in the cells of the palisade tissue. The general aspect of the foliolar architecture shows continuous primary vein until the apex, secondary veins with 4 to 5 pairs, symmetrically disposed and alternated among themselves and in relation to the primary vein, forming arches without reaching the margin, configuring brochidrome pattern, with few free simple endings and most branched. Many of the characteristics found are common to the Papilionoideae sub-family, however it is observed that the species is amphistomatic, with stomata on both sides, palisade parenchyma isobilateral and trichomes on the entire leaf lamina, characteristics associated with xeromorphic species, leading us to suppose that this species is also adapted to hydric stress and high luminosity.