Ontogeny of the secretory cavities of eleven Myrtaceae species

• Autor(a) principal: Ribeiro, João Paulo Oliveira
• Data de Publicação: 2021
• Outros Autores: Silva, Cleber José da
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista Fitos
• Texto Completo: https://revistafitos.far.fiocruz.br/index.php/revista-fitos/article/view/1103
• topic: Anatomy; Arrack; Secretory epithelium; Schizolisigena; Anatomia; Araçá; Epitélio secretor; Esquizolisigena

Secretory cavities are mentioned among species of the Myrtaceae family. The secretory cavities have different origins, which may be due to the separation of cells (schizogeny), programmed cell death (lysigeny) or the combination of these two processes (schizolysigeny). This work describes ontogeny of the leaves cavities of eleven species of the Myrtaceae family. Vegetative apexes of specimens occurring in the region of the municipalities of Itutinga and Sete Lagoas, Minas Gerais, were used. The samples were fixed in FAA70, dehydrated in an ethanol series and included in methacrylate. Transverse and longitudinal sections were obtained in a rotary microtome and stained with Toluidine Blue. Permanent slides were mounted with synthetic resin. The cavities point to an origin in the fundamental meristem, with thin walls and dense cytoplasm, and with intense cell division activity, originating the secretory epithelium with characteristically flat cells at an early stage. The separation of cells within the cavity occurs simultaneously to the formation of the secretory epithelium. At the end of the formation process, the cavities undergo an apoptosis event, in which cells inside are degraded, characterizing schizogenous process.