Karyotype analysis in two species of Solanum (Solanaceae) Sect. Cyphomandropsis based on chromosome banding

MIGUEL V; ACOSTA MC; MOSCONE EA

New Zealand Journal of Botany

RSNZ PUBLISHING

Año: 2012 vol. 50 p. 217 - 225

0028-825X

To contribute to the cytogenetic characterization of Solanum Cyphomandra clade, fluorescence banding and silver staining were performed in Solanum fusiforme and S. stuckertii for the first time. Both species present 2n = 24 chromosomes. Solanum fusiforme has a karyotype consisting of 9m + 3sm chromosome pairs; one pair has active nucleolar organizer regions (NORs). Solanum stuckertii has 8m + 4sm chromosome pairs with two pairs presenting active NORs. The two entities exhibit similar amounts of constitutive CMA+/DAPI- heterochromatin (11%), rich in GC base pairs. This heterochromatin is distributed in a complex pattern of mainly intercalary bands. Localization of chromosome specific markers was successful, allowing recognition of all chromosomes of the complement. With the aim of contributing to the determination of the interspecific relationships within the Cyphomandra clade, we discuss our results with  previous findings for species in this clade.