Abstract
Species belonging to the Alismataceae (Echinodorus) and Limnocharitaceae (Hydrocleys and Limnocharis) families were analysed by banding with CMA/DAPI fluorochromes, C/CMA/DAPI banding, and in situ hybridization (FISH) with probes that recognise 45S rDNA. All species of Echinodorus presented 2n = 22, but only in E. lanceolatus were DAPI+ telomeric bands in seven chromosome pairs observed. A bimodal karyotype and GC-rich heterochromatin preferably located in two smaller acrocentric pairs that generally corresponded to the number of sites of 45S rDNA. A similar pattern of bands was observed in both Limnocharis species (2n = 20), but the two differed with respect to 45S rDNA, with L. laforestii showing only two sites. Hydrocleys nymphoides and H. martii had a chromosome number of 2n = 16, but the position of the GC-rich heterochromatin associated with the satellite differed among chromosomal types. In this work, the cytotaxonomic implications of these patterns are discussed and correlated with previous data from the literature.
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