We induced a polyploidy type of a selected clone (UnB 530) by applying an aqueous solution of 0.2% colchicine to lateral buds for a period of 12 h. The stem identified as tetraploid was propagated to produce the whole plant (Nassar, 2003b, 2004). Diploid and tetraploid mature stems of cassava clone UnB 530, grown at the biological station of the Universidade de Brasília, were sampled from different plants. Samples were fixed in 70% formaldehyde acetic acid and alcohol (Johansen, 1940) and preserved in 70% ethanol.