COMBINING ABILITY OF SOME NEW Bc MAIZE INBREDS

U dvogodišnjim poljskim pokusima na dvije lokacije ispitana je kombinacijska sposobnost sedam srodnih samooplodnih Bc linija kukuruza križanih s četiri testera (Bc252, F2, Bc16881, Rx370-811). Efekti opće kombinacijske sposobnosti (OKS) linija za svojstvo sadržaj vode u zrnu su bili opravdani u sva četiri pokusa, za prirod zrna u dva, a za broj poleglih i polomljenih biljaka u tri pokusa. Linija Bc21491 je imala najviše pozitivne efekte OKS za svojstvo priroda zrna, međutim najkasnija je s najvećim pozitivnim efektom OKS za sadržaj vode u zrnu kod berbe. Linije Bc01/84, Bc706-43 i Bc24331 su se pokazale kao rane s negativnim efektom OKS za sadžaj vode u zrnu kod berbe. Linije Bc24331, Bc01/84 i Bc706-9 su se na osnovi efekata OKS pokazale kao najotpornije prema lomu, dok su najbolji opći kombinatori za broj poleglih biljaka bile inbred linije Bc706-43, Bc706-9 i Bc24331. Specifična kombinacijska s posobnost je najznačajnija za svojstvo priroda zrna gdje su u tri pokusa dobiveni opravdani efekti SKS. Križanci Bc24331xBc16881, Bc24331xRx370-881, Bc406-87xF2 i Bc21491xBc252 su se istakli pozitivnim efektima SKS za prirod zrna. To su uz rani hibrid Bc706- 9xBc252 i gospodarski najvrednije kombinacije. Primijenjena shema linija x tester pokazala se djelotvornom u praktičnom oplemenjivanju kukuruza.Combining ability of seven related Bc maize inbreds, crossed with four testers (Bc252, F2, Bc16881, Rx370-811) was tested in two year field trials, at two locations. GCA effects of the lines were significant for grain moisture in all four trials, for grain yield in two trials, and for lodged and broken plants in three trials. The line Bc21491 had the highest positive GCA effects for grain yield. However, it was latest, with the highest positive GCA effect for harvest grain moisture. The lines Bc01/84, Bc706-43, and Bc24331 proved to be late with negative GCA effect for harvest grain moisture. Based on GCA effects, the lines Bc24331, Bc01/84 and Bc706-9 proved as most resistant to breakage. The best general combiners for number of lodged plants were the lines Bc706-43, and Bc706 and Bc24331. Specific combining ability was omst significant for grain yield. In three trials, SCA effects were significant. The crosses Bc24331 x Bc16881 ,Bc24331 x Rx370-811 , Bc406-87 x F2, and Bc21491 x Bc252 were distinguished by their positive SCA effects for grain yield. Along with the early hybrid Bc706-9 x Bc252, they are economically the most valuable combinations. The applied line x tester scheme proved to be effective in practical maize breeding