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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/38362
Title: 
Embryology and seed development of Syngonanthus caulescens (Poir.) Ruhland (Eriocaulaceae-Poales)
Author(s): 
Institution: 
Universidade Estadual Paulista (UNESP)
ISSN: 
0304-3770
Abstract: 
The embryology and the seed development of Syngonanthus caulescens are presented. This species possesses: a bithecous and tetrasporangiate anther, with a four-layered wall, a conspicuous endothecium of the baseplate type, a secretory tapetum formed by uninucleate cells, successive microsporogenesis resulting in isobilateral microspore tetrads, spiraperturate and binucleate pollen grains, an orthotropous, pendulous, bitegmic and terminucellate ovule, with a micropyle formed only by the inner integument, a megagametophyte of the Polygonum type, with formation of an antipodal cyst, free-nuclear and starchy endosperm, a broad and bell-shaped embryo, operculate and endotestal seeds, a seed coat derived from the inner layers of both integuments, and tanniniferous endotegmen. These embryological aspects are characteristic not only for Syngonanthus, but for the whole family, with few differences between genera. Furthermore, the pollen grain of the spiraperturate type and the cystic arrangement of the antipodals in the megagametophyte are peculiar and very distinctive features of Eriocaulaceae within the other Poales (commelinids). (c) 2006 Elsevier B.V. All rights reserved.
Issue Date: 
1-Feb-2007
Citation: 
Aquatic Botany. Amsterdam: Elsevier B.V., v. 86, n. 2, p. 148-156, 2007.
Time Duration: 
148-156
Publisher: 
Elsevier B.V.
Keywords: 
  • embryology
  • seed development
  • Syngonanthus caulescens
  • Eriocaulaceae
  • Poales
Source: 
http://dx.doi.org/10.1016/j.aquabot.2006.09.019
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/38362
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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