Estimates of genetic parameter in maize commercial variety IPR 114 at Paraná State, Brazil

the objective of this study was to estimate the genetic parameters of the ipr 114 maize commercial variety for breeding purpose and the efficiency of the method. it was perfomed two cycles of half-sib progenie, between 2004 and 2007. the progenies were evaluated in a randomized complete block desing with two replications per environments and the plots were composed of one 4 m length row spaced on 0.8 m, and five plants per meter. the trials were carried out in londrina and ponta grossa, paraná state, brazil. there were evaluated 173 and 154 progenies for selection cycles 1 and 2, respectively, analyzing the following traits: plant height, ear height, days to flower, prolificacy and predict grain yield. in both cycles verified significant genetic variability between progenies. significant selection gains were obtained for predict grain yield, showing 6,33 and 5,03% for cycles 1 and 2, respectively. the estimative for genetic parameters obtained in this work justify the selection program continuity of the ipr 114 maize population.