IAPT/IOPB chromosome data 20. MALVACEAE

LAVIA, G.I.; KRAPOVICKAS, A.; MARTÍNEZ, M.A.

TAXON

INT ASSOC PLANT TAXONOMY

Lugar: Viena; Año: 2015 vol. 64 p. 1346 - 1346

0040-0262

Malvaceae constitutes a family of cosmopolitan distribution, with about 130 genera and 1600 species. Although they were carried out many cytogenetic studies in Gossypium and Malva, knowledge of the rest of the family is scarce. Known chromosome numbers in Malvaceae ranging from 2n = 10 in species of different genera to 2n = 196 in species of Abelmoschus , also present different basic numbers: 5, 6, 7, 8, 10, 11, 12, 13, 15, 17, 18, 19, 20, 29, 36; turning it into a family of interest to cytogenetic and evolutionary studies (Fernández, 1974, 1981; Fernández et al., 2003). In this work, we present chromosomic counts of 17 accessions of Malvaceae species in nine genera collected in four American countries, Argentina, Bolivia, Paraguay and Uruguay, in order to increase knowledge about this family and provide a basis for further studies as required. Chromosome counts were carried out in actively growing root-tips (10?15 mm long) from germinating seeds in Petri dishes, pretreated with 2 mM 8-hydroxyquinoline for 3 h at room temperature, and then fixed in 3:1 absolute ethanol: glacial acetic acid for 24 h, and preserved in ethanol 70°. The staining was performed using the technique of Feulgen.