SciELO - Scientific Electronic Library Online

 
vol.67 número1Especies exóticas de la vertiente occidental de la cordillera de la Costa, Provincia de Valparaíso, Chile centralNuevo recuento cromosómico para Blechnum hastatum (Blechnaceae-Pteridophyta), con un estudio de la ontogenia y tipos de leptoporangios adultos índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

Compartir


Gayana. Botánica

versión impresa ISSN 0016-5301versión On-line ISSN 0717-6643

Resumen

VALDIVIA, Carlos E; CISTERNAS, Mauricio A  y  VERDUGO, Gabriela S. Reproductive biology aspects of two species of the genus Gavilea (Orchidaceae, Chloraeinae) in populations from Central Chile. Gayana Bot. [online]. 2010, vol.67, n.1, pp.44-51. ISSN 0016-5301.  http://dx.doi.org/10.4067/S0717-66432010000100005.

The extent to which plants depend on pollinators for outcross pollen transportation is a key issue in plant reproductive ecology. We evaluated the putative breeding system, foral display, and natural pollination in two Southern Cone of South American orchids, Gavilea araucana and G. venosa, by performing four hand pollination trials (agamospermy, autogamy, geitonogamy, and xenogamy tests) and by counting each fower and fruit produced by plants in natural conditions. Fruit set differed signifcantly depending on the origin of pollen as well as on the presence of a pollen vector. None of these species produced fruits by the agamospermy tests, therefore indicating that they require the presence of pollen on the stigmas for fruit setting. By contrast, only G. araucana was capable of fruit setting following the autogamy test, therefore demostrating that this orchid needs not depend on pollinators for fruit set. Furthermore, G. araucana and G. venosa produced 100% fruits by geitonogamy and by xenogamy, thereby indicating that both plants are totally self-compatible. The mean number of fowers per plant was 2.1 times higher in G. venosa with respect to G. araucana; however, natural fruiting success was 28.8% and 98.9%, respectively. Furthermore, while the increase in fruiting success signifcantly and positively correlated with an increase in foral display in G. araucana, in G. venosa these variables were unrelated. Certainly, further studies concerning the reproductive strategies in orchids of southern South America are of great importance.

Palabras clave : Autogamy; allogamy; self-compatibility; foral display; fruiting patterns.

        · resumen en Español     · texto en Inglés     · Inglés ( pdf )

 

Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons