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Gayana. Botánica

On-line version ISSN 0717-6643

Abstract

ESCOBAR, lNELIA; RUIZ, EDUARDO  and  BAEZA, CARLOS. Karyotypic studies in species of Gilliesieae Lindl. (Gilliesioideae-Alliaceae) from central Chile. Gayana Bot. [online]. 2012, vol.69, n.2, pp.240-250. ISSN 0717-6643.  http://dx.doi.org/10.4067/S0717-66432012000200003.

The tribe Gilliesieae Lindl. belong to the South American group ofAlliaceae, is characterized by high floral diversification, displaying different degree of bilateral symmetry, varied number of tepals and stamens and floral appendages, with high levels of endemism mainly in the Mediterranean climate zone of central Chile. Cytologically chromosome numbers only of three species are known. In the present study, the karyotype of ten species corresponding to the genera Ancrumia, Gethyum, Gilliesia, Miersia, Solaria and Speea, are documented. First reports are provided for seven taxa: Ancrumia cuspidata, Gilliesia graminea, G. montana, Miersia minor, M. leporina, M. tenuiseta y Speea humilis. Three chromosomal sets are observed, Miersia spp. and Speea with 2n=12 (10m+2t), M. chilensis with 2n=20 (2m+18t) and Ancrumia, Gethyum, Gilliesia and Solaria with 2n=14 (4m+4sm+6t). The studied species are diploid and showed large chromosomes, some of them larger than 22 μΓη, frequently metacentric or telocentric, and with a conserved fundamental number (FN=11). The results suggest that Robertsonian exchanges could play a major role in the evolution of the tribe and subfamily.

Keywords : Karyotypes; chromosome number; Robertsonian exchanges; centric fission; endemism.

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