Ultrastructure of the wild rice Oryza grandiglumis (Gramineae) in Costa Rica.
Rev Biol Trop
; 54(2): 377-85, 2006 Jun.
Article
em En
| MEDLINE
| ID: mdl-18494308
Oryza grandiglumis is a wild species of rice endemic to tropical America. This species was first found in 1998 in the wetlands of Caño Negro, located in the northern part of Costa Rica. Twenty five plants of O. grandiglumis were processed for scanning electron microscope. An ultrastructural description of the leaf blade, ligule, auricles, spikelet and caryopsis, with an emphasis on structures of taxonomic value. The leaf blade has a characteristic cuticular wax pattern, composed of dense rod-like structures, and is surrounded by papillae, zipper-like silica cells, abundant bulky prickle trichomes, and hooked trichomes. The blade's edge has three rows of hooked prickle trichomes of various sizes. The auricles wrapped the culm, with long attenuated trichomes at the edges; the base was surrounded by oblong cells. The ligule is a blunt membrane covered by short prickle trichomes. Spikelet morphology is characteristic of the Poaceae family, but the sterile lemmas were nearly as long as the fertile lemmas, and they have an unique crown-like structure of lignified spines between the rachilla and the fertile lemmas. Comparison with Brazilian specimens of O. grandiglumis revealed little differences in the ultrastructural characteristics.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Oryza
/
Componentes Aéreos da Planta
País/Região como assunto:
America central
/
America do sul
/
Brasil
/
Costa rica
Idioma:
En
Revista:
Rev Biol Trop
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Costa Rica
País de publicação:
Costa Rica