Evaluation of donor lines as sources of new favorable alleles for the yield of grain not present in the elite hybrid parent line was conducted, or the unfavorable alleles according to Dudley method were already fixed (1987a, b). All four inbred lines, potential donors had significant values of parameter uG, so they can be used as the sources of new genes in the improvement of elite hybrid A654 x Fu4 yield. Line ZPLB36S had the greatest number of favorable predominant alleles for grain yield improvement, and the improvement should be conducted by means of self-fertilization of hybrids of this line with parental line Fu4, since the parentage of all donor lines is greater with Fu4 then with A654.Izvršena je procena linija donora kao izvora za nove poželjne alele za prinos zrna koji se ne nalaze kod linija roditelja elitnog hîbrida ili su već fiksirani nepoželjni aleli po metodi Dudley (1987a,b). Sve četiri inbred linije, potencijalni donori, su imale značajne vrednosti parametra G, tako da se mogu koristiti kao izvor novih gena u popravci prinosa elitnog hibrida A654 x Fu4. Najveći broj poželjnih dominantnih alela za popravku prinosa zrna imala je linija ZPLB36S, a popravku treba vršiti putem samooplodnje hibrida ove linije saroditeljskom linijom Fu4, jer je srodnost svih linija donora veća sa Fu4 nego sa A654
