Genetic and morphological variation in the Bulbophyllum exaltatum (Orchidaceae) complex occurring in the Brazilian “Campos Rupestres”: implications for taxonomy and biogeography
DOI:
https://doi.org/10.15517/lank.v7i1-2.18446Palabras clave:
allozymes, Bulbophyllum exaltatum, Cadeia do Espinhaço, campo rupestre, genetic variability, geographic barrierResumen
Bulbophyllum Thouars is a pantropical genus. It is one of the most species-rich genera of the Orchidaceae, with ca. 1.200 species (Dressler 1993). The genus pre- sents myophily (pollination by Diptera) as pollination syndrome. Because orchid species are mainly self- compatible, we expect that fly-pollinated orchids pre- sent low variability within the populations and high genetic differentiation among conspecific populations, due to the reduction of the gene flow (Borba & Semir 1998, Borba et al. 2001). This could help to explain the high number of species in genera of fly-pollinated orchids, most of them with restricted distribution.
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