engleski

Response of M3 population of maize to selfed progeny recurrent selection

Recurrent selection has been widely used by maize breeders for population improvement. In this study selfed progeny (SP) recurrent selection for yield improvement was conducted in the M3 maize population developed by crossing 12 Croatian inbred lines. Objective of the study was to evaluate the effect of two SP selection cycles on improving population performance per se. In the firs cycle of selection, after evaluation of grain yield as well as root and stalk lodging resistance, 40 S2 lines were chosen and intermated to form C1 population. In the second cycle of selection 30 and 20 best yielding S1 lines were recombined to form C2(+30) and C2(+20) population respectively. The original population (C0), the first cycle population (C1) and two second cycle populations C2(+30) and C2(+20) were evaluated in three environments using a randomized complete block design with three replications. Over two cycles of selection yield of the population increased 0,19 t ha-1 cycle-1 or 2,4% cycle-1 from C0 to C2(+30) and 0,13 t ha 1cycle-1 or 1,7% cycle-1 from C0 to C2(+20). In the first cycle of selection significant improvement in stalk lodging resistance was achieved too. In the next cycle this gain was lost with more positive response in C2(+30). Changes in other traits were generally in the desired direction and slightly greater in the C2(+30) compared to C2(+20) population. The undesirable shift toward the higher grain moisture at maturity was observed in both C2(+30) and C2(+20) populations.

maize; recurrent selection

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