Propagation and in vitro tuberization of two varieties of potato Yazar: Araque Barrera, Eyda Johanna, Bohórquez Quintero, María de los Angeles, Pacheco Díaz, José Estiben, Correa Mora, Lenny Yojana, Urquijo Ruiz, Johan Sebastian, Castañeda Garzón, Sandra Liliana, Pacheco Maldonado, José Constantino