RAPD markers were used to assess genetic fidelity of 23 micropropagated plants of a single clone (L34) of Populus deltoides. Eleven arbitrary 10-base primers were successfully used to amplify DNA from in vivo and in vitro material. Of these, 5 distinguished a total of 13 polymorphisms common across 6 micropropagated plants. Apart from these 6 plants, the amplification products were monomorphic across all the micropropagated plants, the mother plant and 4 additional fieldgrown control plants. Our results show that RAPD markers can be used to gain rapid and precise
information about genetic similarities or dissimilarities in micropropagation systems that might not be so easily evident from other commonly used techniques.