IBONE   05434
INSTITUTO DE BOTANICA DEL NORDESTE
Unidad Ejecutora - UE
artículos
Título:
Ultrastructural study of pollen and anther development in Luehea divaricata (Malvaceae, Grewioideae) and its systematic implications: Role of tapetal transfer cells, orbicules and male germ unit
Autor/es:
LATTAR, E., GALATI, B. G. & FERRUCCI, M.S.
Revista:
FLORA
Editorial:
ELSEVIER GMBH
Referencias:
Año: 2012 vol. 207 p. 888 - 894
ISSN:
0367-2530
Resumen:
Developmental processes of microsporogenesis and microgametogenesis in Luehea divaricata (Malvaceae, Grewioideae) were analyzed with transmission electron microscopy. The species studied has perfect flowers. The young anthers are bithecal and tetrasporangiate; microspore mother cells undergo simultaneous meiosis forming tetrads with a tetrahedral arrangement. The development of the anther wall conforms to the basic type and the tapetum is of the secretory type. The results highlighted the presence of multinucleate tapetal cells that acquire ultrastructural features characteristic of transfer cells in the young pollen grain stage, associated to the presence of orbicules. Tapetal transfer cells have not been investigated in detail previously for other species of angiosperms; its function during the pollen development is discussed. These data constitute the first contribution to the knowledge of the ultrastructural pollen development in the genus Luehea, as well as to the subfamily Grewioideae.