IBONE   05434
INSTITUTO DE BOTANICA DEL NORDESTE
Unidad Ejecutora - UE
artículos
Título:
Anatomía reproductiva en flores estaminadas y pistiladas de Allophylus edulis (Sapindaceae)
Autor/es:
GONZÁLEZ, VALERIA VANESA; SOLÍS S. M.; FERRUCCI M.S.
Revista:
BOLETíN DE LA SOCIEDAD ARGENTINA DE BOTáNICA
Editorial:
SOCIEDAD ARGENTINA DE BOTÁNICA
Referencias:
Lugar: Córdoba; Año: 2014 vol. 49 p. 207 - 216
ISSN:
0373-580X
Resumen:
Reproductive anatomy of staminate and pistillate flowers of Allophylus edulis (Sapindaceae). Sporogenesis and gametogenesis of staminate and pistillate flowers of Allophylus edulis (Sapindaceae) were studied. Young anthers are similar in both types of flowers, they share the basic type of antheral development; they consist of epidermis, endothecium, two middle layers and a secretory tapetum with uninucleate and/or binucleate cells. Microsporogenesis is normal, the division of pollen mother cells is simultaneous, and microspore tetrads are tetrahedral and decussate. The mature anther in staminate flowers presents epidermal cells thinned at stomio level, and endothecium cells with fibrillar thickenings. A single locule is formed in the theca by dissolution of the septum and pollen grains are two-celled when shed, these are triporate or tetraporate. The gynoecium is reduced to a tricarpelar, trilocular pistillode, with an ovule per locule. Ovule degeneration occurs before meiosis. The mature anthers of pistillate flowers differ anatomically from those of staminate flowers. The endothecium does not develop fibrillar thickenings, middle layers and tapetum generally are persisting, and the stomium is nonfunctional; anthers are indehiscent. The gynoecium has a tricarpellary and trilocular ovary. Each locule contains an ovule hemianatropous, bitegmic and crassinucellate, with an obturator well developed, and the embryo sac is of Polygonum type. Results are discussed in relation to the known to the family.