STUDIES ON FREQUENCY DISTRIBUTION OF YIELD AND YIELD RELATED TRAITS IN F2M2 GENERATION OF SESAME (Sesamum indicum L.)

Abstract

The present investigation was undertaken to assess the combined effects of hybridization and mutagenesis on distribution parameters of yield and its related traits. The materials were grown in Randomized Block Design with three replications at Economic Botany-II Section of the Department of Plant Breeding and Genetics, College of Agriculture, OUAT, Bhubaneswar and observations were taken on polygenic traits. All populations appeared as fairly symmetrical, except 1 F 2 1 M 2 (0.638) and 3 F 2 2 M 2 (0.829) showing moderately positive skewness for plant height. Frequency curves showed restricted distribution in mutants for primary branches per plant than respective controls. All the populations showed moderately positive skewness except, 3 F 2 and 3 F 2 2 M 2 with highly positive skewness (1.296) and nearly symmetrical distribution (0.106) for number of capsules per plant. All the populations showed moderate to high positive skewness for seed yield per plant. Populations 2 F 2 , 2 F 2 1 M 2 , 3 F 2 and 3 F 2 2 M 2 showed leptokurtic distribution with kurtosis estimates of 3.971, 5.088, 4.678 and 5.721 respectively for this character. In general, negative changes were observed for plant height and positive changes for number of capsules per plant and seed yield per plant in mutants compared to respective controls. These changes must have come through induced mutagenesis indicating higher effectiveness of mutagenesis on hybrids for enlarging variations.This variability might be further utilized in the potential breeding programme for yield improvement.