Artículos de revistas
Morphology and development of anthers and ovules in Croton and Astraea (Euphorbiaceae)
Fecha
2011-01-01Registro en:
Nordic Journal of Botany. Malden: Wiley-blackwell, v. 29, n. 4, p. 505-511, 2011.
0107-055X
10.1111/j.1756-1051.2011.01072.x
WOS:000294824400024
2126319926799273
Autor
Universidade Federal de Minas Gerais (UFMG)
Universidade Estadual Paulista (Unesp)
Institución
Resumen
We examined the embryological development of anthers and ovules from Astraea (A. lobata and A. praetervisa) and Croton (C. floribundus, C. fuscescens, C. glandulosus, C. lundianus, C. piptocalyx, C. urucurana and C. triqueter) focusing on features with systematic significance for the group. Some of these features are common in Euphorbiaceae including: a dicotyledonous type of anther wall formation, a secretory tapetum, a mixed origin of the outer ovule integument, an epidermal origin of the inner ovule integument, the occurrence of many archesporial cells inside the ovules and a megagametophyte of the Polygonum-type. Other features, such as the presence of styloid crystals in the tapetum, an idioblast with a druse in the endothecium, simultaneous and successive microsporogenesis, and a functional micropylar megaspore, have not previously been reported in the family. These characters appear to distinguish Croton and Astraea from other Euphorbiaceae and possibly represents autapomorphies for the tribe Crotoneae.