Caracterización Citogenética de Cinco Genotipos de Papa Criolla, Solanum phureja (Juz. et Buk.) Cytogenetic Characterization of Five "Criolla" Potato Genotypes, Solanum phureja (Juz. et Buk.)

Potato crop is forth in importance worldwide after rice, wheat, and corn. Diploid potato cv. Criolla (Solanum phureja) shows highly desired culinary and nutritional characteristics, such as vitamins, minerals, fiber and protein quality. Colombia is a diversity and origin center of diploid potatoes cv. Criolla, which represents an enormous genetic resource potential for plant breeding. At Universidad Nacional de Colombia the potato "criollas" germplasm bank is mantained. Karyotype analysis is important for understanding genetic basis of plant breeding. Despite the importance of this resource karyotype analysis of this collection has not been completed. In this study two accesions of the S. phureja collection and three genotypes from a F1 obtained from a cross between a late blight disease resistant and a susceptible genotype were characterized. Comparative analysis allowed the identification of differences in the cellular morphology, two ploidy levels (diploid and triploid) with aneugenic variations (hypodiploidy and double trisomy), and four chromosome numbers (18, 24, 26 y 36) for the five genotypes