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2Department of Agronomy, The University of Agriculture, Peshawar, KPK, Pakistan
3Department of Botany, University of Peshawar, KPK, Pakistan
Recurrent selection is a cyclical selection procedure for improving the mean performance of plant populations. The goal of current research was to determine genetic variability, heritability, selection differential, expected response, percent gain cycle-1 and genotypic and phenotypic correlations among various traits. Sixty four half sib recurrently selected families derived from CIMMYT maize population CZP-132011 were evaluated in 8×8 square lattice design with two replications at Cereal Crops Research Institute (CCRI), Pirsabak during 2017. Data were noted on ear plant-1, ear length, ear diameter, grain rows ear-1, grains row-1, 1000 grain weight and grain yield. Results showed highly significant differences among half sib families for all the studied traits. High heritability (h2 ˃ 0.60) was recorded for all traits except 1000 grain weight which exhibited moderate heritability. High index of variation (I.V ˃ 1.00) was observed for all traits. Based on heritability and selection differential, the expected response was negative for plant height (-2.81 cm) and ear height (-5.22 cm), while positive expected response was recorded for ears plant-1 (0.15), ear length (1.48 cm), ear diameter (0.30 cm), grain rows ear-1(1.30), grains row-1(2.94), 1000 grain weight (14.19 g) and grain yield (153.04 kg ha-1). After one cycle of recurrent selection in these half sib families, the gain cycle-1 was recorded negative for plant height (-2.34%), ear and height (-4.90%),while positive gain cycle-1 was observed for ears plant-1 (3.26%), ear length (3.06%), ear diameter (4.99%), grain rows ear-1 (2.57%), grains row-1 (7.84%), 1000 grain weight (5.87%) and grain yield (4.17%).Grain yield exhibited significant and positive correlation with ear length (rG = 0.50** and rP = 0.33*) both at genotypic and phenotypic levels. Based on the findings of current experiment, it could be concluded that improvement in half sib families through recurrent selection method was found effective and population CZP-132011 has the potential of improvement through further recurrent selection.