SUMMARY
The ability of the maize inbred lines of the Lancaster germ plasm to maintain morphogenic potential of the callus under long cultivation has been estimated. The capability to long-term morphogenic callusogenesis is genotypically determined and longer in the Mo17/Oh43 subplasm line. The line of Oh43 subplasm may be the base for the long-continued cultivation of morphogenic calluses. Regenerated plants from the long-continued cultivated calluses were obtained. Promising inbreds for usage in biotechnology and breeding programs were identified.