Daily Archives: 7th of May 2012

Reproductive isolation between hybridizing orchids

Reproductive isolation between hybridizing orchids

Reproductive isolation between hybridizing orchids

The potential for gene exchange between species with different ploidy levels has long been recognized, but only a few studies have tested this hypothesis in situ and most of them have focused on not more than two co-occurring species.

De hert et al  examine hybridization patterns in three species of the genus Dactylorhiza (Orchidaceae; diploid D. incarnata and D. fuchsii, and allotetraploid D. praetermissa). Morphometric and molecular analyses indicate that the majority of hybrids are F1 hybrids.

Crossing experiments show strong post-zygotic barriers and high sterility of the hybrids; however, the presence of triple hybrids indicates that in some cases hybridization may extend the F1 generation.