Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/433
Type: Artigo de periódico
Title: Anatomical development of the pericarp and seed of Oncidium flexuosum Sims (ORCHIDACEAE)
Author: MAYER, Juliana Lischka Sampaio
CARMELLO-GUERREIRO, Sandra Maria
APPEZZATO-DA-GLORIA, Beatriz
Abstract: Interpretation of the anatomical structure of the ovary and fruit of the Orchidaceae family is still controversial, which makes it difficult to understand the development and dehiscence of the fruit. The genus Oncidium is polyphyletic and is currently the subject of taxonomic studies. In this study, we have investigated the anatomical development of the pericarp and seed of Oncidium flexuosum Sims to determine important diagnostic characters that, along with molecular data, can assist in defining this group. We have found a new anatomical characteristic of the family: the presence of precursor cells for fruit dehiscence, which were visible from the beginning of development and located on the outer walls of the sterile valves. In contrast with what has been observed by different authors with other species, in the mature fruit of O. flexuosum, only the endocarp of the fertile valves and a few cells near the exocarp and the vascular bundle in the sterile valves show parietal thickening, while the rest remains parenchymatous. During the development of the ovule and embryo, we have shown that the embryonic sac of this species has eight nuclei and that the embryo has a long and elaborate suspensor. (C) 2011 Elsevier GmbH. All rights reserved.
Subject: Embryology
Orchid
Pericarp
Reproductive anatomy
Zygotic embryo
Country: Alemanha
Editor: ELSEVIER GMBH, URBAN & FISCHER VERLAG
Citation: FLORA, v.206, n.6, p.601-609, 2011
Rights: fechado
Identifier DOI: 10.1016/j.flora.2011.01.009
Address: http://apps.isiknowledge.com/InboundService.do?Func=Frame&product=WOS&action=retrieve&SrcApp=EndNote&UT=000292491700010&Init=Yes&SrcAuth=ResearchSoft&mode=FullRecord
http://dx.doi.org/10.1016/j.flora.2011.01.009
Date Issue: 2011
Appears in Collections:IB - Artigos e Materiais de Revistas Científicas

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