FERRUCCI Maria silvia
Anatomía reproductiva en flores estaminadas y pistiladas de Allophylus edulis (Sapindaceae)
GONZÁLEZ, VALERIA VANESA; SOLÍS S. M.; FERRUCCI M.S.
BOLETÃN DE LA SOCIEDAD ARGENTINA DE BOTÃ¡NICA
SOCIEDAD ARGENTINA DE BOTÁNICA
Lugar: Córdoba; Año: 2014 vol. 49 p. 207 - 216
Reproductiveanatomy of staminate and pistillate flowers of Allophylus edulis (Sapindaceae).Sporogenesis and gametogenesis of staminate and pistillate flowers ofAllophylus edulis (Sapindaceae) were studied. Young anthers are similar in bothtypes of flowers, they share the basic type of antheral development; theyconsist of epidermis, endothecium, two middle layers and a secretory tapetumwith uninucleate and/or binucleate cells. Microsporogenesis is normal, thedivision of pollen mother cells is simultaneous, and microspore tetrads aretetrahedral and decussate. The mature anther in staminate flowers presentsepidermal cells thinned at stomio level, and endothecium cells with fibrillarthickenings. A single locule is formed in the theca by dissolution of theseptum and pollen grains are two-celled when shed, these are triporate ortetraporate. The gynoecium is reduced to a tricarpelar, trilocular pistillode,with an ovule per locule. Ovule degeneration occurs before meiosis. The matureanthers of pistillate flowers differ anatomically from those of staminateflowers. The endothecium does not develop fibrillar thickenings, middle layersand tapetum generally are persisting, and the stomium is nonfunctional; anthersare indehiscent. The gynoecium has a tricarpellary and trilocular ovary. Eachlocule contains an ovule hemianatropous, bitegmic and crassinucellate, with anobturator well developed, and the embryo sac is of Polygonum type. Results arediscussed in relation to the known to the family.