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Allagoptera arenaria (Arecaceae): Leaf anatomy of a palm from the Brazilian shore
- Antunes e Defaveri, Anna Carina, Franca Barros, Claudia, do Carmo de Oliveira Arruda, Rosani, Kato Simas, Naomi, Sato, Alice
- Brittonia 2015 v.67 no.4 pp. 336-349
- Allagoptera, epicuticular wax, flavonoids, histochemistry, leaves, lignin, lipids, mesophyll, microstructure, polyphenols, silica, waxes, Brazil
- Allagoptera arenaria (Arecaceae), commonly known as “guriri,” is a palm that occurs only along the sandy coastal environments of Brazil. This work carries out a thorough analysis of A. arenaria leaf anatomy, including histochemistry and micromorphology, with special emphasis on leaf epicuticular waxes. Several common features of palms were identified, as well as characters not yet reported for the family or the species. Allagoptera arenaria pinnae possess a one-layered epidermis, hypodermis with two adaxial layers and one abaxial layer, homogeneous mesophyll composed of palisade cells, three different types of collateral veins, a prominent adaxial midrib, and silica inclusions. Although both margins of A. arenaria pinnae have a similar appearance, the shape of the leaf margins can vary. Scales or ramenta were found on the abaxial surface of the midrib on the median and basal portions of the pinnae. Histochemical analysis revealed the presence of polyphenols, flavonoids, lignin, and neutral and acidic lipids. The most distinctive character of A. arenaria pinnae is the presence of a thick layer of epicuticular waxes covering both the adaxial and abaxial surfaces. These results suggest the potential for exploiting A. arenaria as an alternative source of industrial waxes.