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Morphology and development of anthers and ovules in Croton and Astraea (Euphorbiaceae)
Author(s) -
Cavalari DePaula Orlando,
das Graças Sajo Maria
Publication year - 2011
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.2011.01072.x
Subject(s) - ovule , biology , tapetum , euphorbiaceae , stamen , botany , integument , croton , megaspore , locule , eudicots , microspore , pollen , taxonomy (biology)
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.