Diversidade cariotípica em Sida (L.) (Malvaceae) e gêneros proximamente relacionados.

Abstract

The genus Sida (Malvaceae) is a heterogenous group, taxonomical unresolved, of wich it's inter and infragenerics boundaries are unclear. The majority of it's approaches are based on morphological data. In this sense, the cut genetic studies have proved to be an excellent tool for a better understanding of the taxonomic and phylogenetic relationships in various groups of plants. One of the topics researched is the analysis of the heterochromatin, wich for years was only known as non-gene sequence area,"junk DNA", until new studies showed it's specificity in cytogenetic and cytogenomics analysis. In the particular case of the genus Sida, the few cytogenetic studies are exclusivelly based on the chromossomic counting, wich varies from 2n = 14 to 2n = 32. Despite the approaches being the starting point for any cytotaxonomic analysis, th echaracterization of the heterochromatin can aid in the understanding of the evolution relationship between the different species. The aim of this research was to characterise the karyotype of the Sida species and similar genera, to make clear taxonomic issues. The CMA and DAPI fluorochome analysis showed diversified patterns of heterochromatic bands, as that said, bringing a new point of view in the differentiation of these species.