XVI International Botanical Congess

The andean crop Oxalis tuberosa is an octoploid that shares the basic chromosome number (x=8) with other species that belong to the same genus but differ in the ploidy degree. This fact allowed the grouping of these species in the Oxalis tuberosa alliance. With the aim to assess which of the species are most directly involved in the poliploid origin of Oxalis tuberosa, we are analysing cloned repetitive DNA sequences by cross hybridization and nucleotide sequencing. Although cross hybridization was observed Southern hybridization patterns vary depending on the species. Amplified fragment lenght polymorphism (AFLP) markers were evaluated across the species that putatively were involved in the evolution of O. Tuberosa and different cultivars of it.