Abstract
Two related species of Gibasis, G. venustula (x = 6) and G. speciosa (x = 5) have been shown to be differentiated by a Robertsonian fusion. Meiotic analysis of the F1 hybrids has revealed further chromosome differentiation of the parent species, involving several interchanges and inversions. These rearrangements tend to be concentrated in the Robertsonian group, and give rise to unusual meiotic configurations. The sets of the two species are nonetheless highly homologous as shown by high chiasma frequency and as much as 65% stainable pollen in the F1. Models are proposed suggesting the possible evolutionary pathways of this karyotypic differentiation. The results are discussed in terms of chromosome evolution and its consequences for these species.
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