COMPARISON BETWEEN PEDIGREE SELECTION AND INDEPENDENT CULLING LEVELS TECHNIQUS FOR IMPROVING SEED YIELD AND ITS COMPONENTS IN SESAME

Abstract

The current experiments were carried out at El-Mattana Agricultural Research Station, Luxor Governorate, Egypt, during the three summer seasons from 2016 to 2018, to compare the relative efficiency of two selection procedures, namely pedigree selection and independent culling level (ICL), for improving seed yield and its components in sesame. The genetic materials were the F3, F4 and F5generations. This study was carried out on 182 of F3 families derived from a single cross between Introduction 688 X hybrid 102 family 2, and added F3 bulked random sample. Variations among the F3 families were highly significant for all the studied traits. The results indicated that pedigree selection decreased the genetic variability measured as genotypic coefficient of variability (GCV) of seed yield/plant and other studied traits. The GCV of seed yield/plant decreased from 28.22 % in the base population to 7.79 % after two cycles of selection, from 32.89 to 13.37 % for capsules No./plant, from 11.11 to 7.63 % for fruiting zone length, and from 13.24 to 9.20 % for 1000-seed weight. Heritability in the broad sense after two cycles of selection was high for seed yield/plant (85.69 %), capsules No./plant (96.55 %), fruiting zone length (89.78 %) and 1000-seed weight (76.40 %). The realized heritability for pedigree selection increased, indicating that increasing seed yield was accompanied with increases in related traits, and the realized heritability increased after the two cycles of ICL technique by 33.9 % from the bulk sample for grain yield/plant. Heritability in the broad sense after two cycles of (ICL) was high for all the studied traits.