Anther development, microsporogenesis and microgametogenesis in Heliconia (Heliconiaceae, Zingiberales)
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
26/02/2014
20/05/2014
26/02/2014
20/05/2014
01/01/2007
|
Resumo |
Anther development, micro sporogenesis and microgametogenesis in several species of Heliconia were investigated as part of a complementary embryological study of the Heliconiaceae. All studied Heliconia species present bithecate and tetrasporangiate anthers with fertile pollen grains; only H. rivularis, a natural hybrid, presented sterile pollen grains of variable size and no content. The anther wall has an uniseriate epidermis and endothecium, the latter with helicoidal thickenings, although some cells of the middle layers also showed thickenings; the biseriate tapetum is of amoeboid non-syncytial type, since the tapetum cells did not fuse together forming a true plasmodium. The microsporogenesis is successive leading to isobilateral tetrads. The inaperturate pollen grains had a very reduced exine consisting of a thin, more or less continuous layer with small spines upon; the pollen grain shape is variable among the species, all of them presenting heteropolar pollen, except H. angusta with isopolar ones. Most of these characteristics were shared with other studied Zingiberales, although more studies need to be done. (c) 2006 Elsevier GmbH. All rights reserved. |
Formato |
148-160 |
Identificador |
http://dx.doi.org/10.1016/j.flora.2006.05.003 Flora. Jena: Elsevier Gmbh, Urban & Fischer Verlag, v. 202, n. 2, p. 148-160, 2007. 0367-2530 http://hdl.handle.net/11449/20236 10.1016/j.flora.2006.05.003 WOS:000244958000008 |
Idioma(s) |
eng |
Publicador |
Elsevier B.V. |
Relação |
Flora |
Direitos |
closedAccess |
Palavras-Chave | #amoeboid non-syncytial tapetum #Heliconia #microgametogenesis #microsporogenesis #pollen grain #zingiberales |
Tipo |
info:eu-repo/semantics/article |