Morphology and development of anthers and ovules in Croton and Astraea (Euphorbiaceae)

Autor(es)

De-Paula, Orlando Cavalari ^[1] ; Sajo, Maria das Gracas ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Minas Gerais, ICB, Dept Bot, BR-31270901 Belo Horizonte, MG - Brazil

^[2] Univ Estadual Paulista, Dept Bot, IB, BR-13506900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NORDIC JOURNAL OF BOTANY; v. 29, n. 4, p. 505-511, 2011.
• Citações Web of Science: 9

Resumo

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. (AU)

• Processo FAPESP: 06/61641-0 - Morfologia e desenvolvimento floral em Croton L. e Astraea Klotzsch (Euphorbiaceae sensu stricto)
• Beneficiário: Orlando Cavalari de Paula
• Modalidade de apoio: Bolsas no Brasil - Doutorado