Reproductive biology aspects of two species of the genus Gavilea Orchidaceae, Chloraeinae in populations from Central ChileReportar como inadecuado




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Resumen

The extent to which plants depend on pollinators for outcross pollen transportation is a key issue in plant reproductiveecology. We evaluated the putative breeding system, floral display, and natural pollination in two Southern Cone ofSouth American orchids, Gavilea araucana and G. venosa, by performing four hand pollination trials agamospermy,autogamy, geitonogamy, and xenogamy tests and by counting each flower and fruit produced by plants in naturalconditions. Fruit set differed significantly 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 ofpollen on the stigmas for fruit setting. By contrast, only G. araucana was capable of fruit setting following the autogamytest, therefore demostrating that this orchid needs not depend on pollinators for fruit set. Furthermore, G. araucanaand G. venosa produced 100% fruits by geitonogamy and by xenogamy, thereby indicating that both plants are totallyself-compatible. The mean number of flowers 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 successsignificantly and positively correlated with an increase in floral display in G. araucana, in G. venosa these variableswere unrelated. Certainly, further studies concerning the reproductive strategies in orchids of southern South Americaare of great importance.Nota general

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Autor: Valdivia, Carlos E.; - Cisternas, Mauricio A.; - Verdugo, Gabriela S.; -

Fuente: http://repositorio.uchile.cl/



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