Developmental anatomy and morphology of the ovule and seed of Heliconia (Heliconiaceae, Zingiberales)


Autoria(s): Simao, D. G.; Scatena, V. L.; Bouman, F.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

26/02/2014

20/05/2014

26/02/2014

20/05/2014

01/01/2006

Resumo

The developmental anatomy and morphology of the ovule and seed in several species of Heliconia were investigated as part of an embryological study of the Heliconiaceae and to provide a better understanding of their relationships with the other families of the Zingiberales. Heliconia species have an ovule primordium with an outer integument of both dermal and subdermal origin. The archesporial cell is divided into a megasporocyte and a single parietal cell, which in turn are divided only anticlinally to form a single parietal layer, disintegrating later during gametogenesis. The embryo sac was fully developed prior to anthesis. In the developing seed, the endosperm was nuclear, with wall formation in the globular stage; a nucellar pad was observed during embryo development, but later became compressed. The ripe fruit contained seeds enveloped by a lignified endocarp that formed the pyrenes, with each pyrene having an operculum at the basal end; the embryo was considered to be differentiated. Most of these characteristics are shared with other Zingiberales, although the derivation of the operculum from the funicle and the formation of the main mechanical layer by the endocarp are unique to the Heliconiaceae.

Formato

143-154

Identificador

http://dx.doi.org/10.1055/s-2005-872815

Plant Biology. Stuttgart: Georg Thieme Verlag Kg, v. 8, n. 1, p. 143-154, 2006.

1435-8603

http://hdl.handle.net/11449/20235

10.1055/s-2005-872815

WOS:000235078600014

Idioma(s)

eng

Publicador

Georg Thieme Verlag Kg

Relação

Plant Biology

Direitos

closedAccess

Palavras-Chave #embryo #Heliconia #megagametogenesis #megasporogenesis #pyrene #Zingiberales
Tipo

info:eu-repo/semantics/article