Inbred lines of different cycles of selection as donors of favourable alleles for the improvement of F1 maize hybrids

Abstract

Eight BSSS and BSCB1 inbred lines of different cycles of selection were studied with the aim to evaluate which inbreds had the highest relative values of favourable alleles for the improvement of the grain yield trait in an elite single cross maize hybrid. Based on estimated parameters μG, UBND, PTC and NI it was determined that the inbreds B73 (C5) and B84 (C7), originating form the synthetic population BSSS had highest number of favourable alleles for the improvement of the grain yield. Both these inbreds belong to the later cycles of recurrent selections and proved to be better donors of favourable alleles than inbreds belonging to the earlier cycles of selection. The rank correlations of used parameters were positive and highly significant, while the highest values of correlations for yield were determined between μG and NI, that is PTC and NI. The highest grain yield was recorded in the hybrid ZPL2 x B73, which also had the highest value of heterosis (174.9%) in the trial for estimation of loci relative values.

Ispitivano je osam inbred linija različitih ciklusa selekcije poreklom iz BSSS i BSCB1 izvora sa ciljem da se oceni koja ima najveće relativne vrednosti poželjnih alela za popravku osobine prinos zrna kod elitnog dvolinijskog hibrida kukuruza. Na osnovu izračunatih parametara μG*, UBND, PTC i NI utvrđeno je da najveći broj poželjnih dominantnih alela za popravku prinosa zrna pokazale su inbred linije B73(C5) i B84(C7) iz sintetičke populacije BSSS. Obe ove linije su iz kasnijih ciklusa rekurentne selekcije i pokazale su se kao bolji donori poželjnih alela u odnosu na linije iz ranijih ciklusa. Korelacije ranga između korišćenih parametara bile su pozitivne i visoko značajne, dok su najveće vrednosti korelacije za prinos utvrđene između μG*i NI, odnosno PTC i NI. Najveći prinos zrna je imao hibrid ZPL2 x B73 koji je u ogledu za procenu relativne vrednosti lokusa pokazao i najveću vrednost heterozisa (174,9%).