Recuentos cromosómicos y análisis cariotípicos en Rebutia krainziana y R. minuscula subsp. wessneriana (Cactaceae, Cactoideae)

The Rebutia genus (Cactaceae-Cactoideae) is endemic to South America, and particularly important in the Northwest of Argentina and South of Bolivia. Broadly speaking, approximately 257 species are clustered in the genus and only for ten of them chromosome numbers were reported. In this work chromosome counts and estimations of karyotypes of Rebutia krainziana y R. minuscula subsp. wessneriana were performed by classical cytogenetic techniques. According to the basic chromosome number x = 11 established for the genus, the results demonstrate that both taxa are diploids. The karyotype analysis shows differences with respect to length and morphology of chromosomes. In this contribution the chromosome numbers and karyotypes of both taxa were estimated for the first time