COMPARATIVE BREEDING POTENTIAL OF SEGREGATING POPULATIONS DERIVED FROM VARYING NUMBER OF PARENTS IN SWEETCORN (Zea mays var. saccharata)
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Date
2023-01-27
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University of Agricultural Sciences, Bangalore
Abstract
Cultivars derived from bi-parental crosses not only have a narrow genetic base but also often lack the desired combination of traits, leading to their genetic vulnerability. We hypothesized that cultivars derived from multi-parent populations are likely to have greater
trait means genetic variability and hence a broader genetic base. To test this hypothesis, the breeding potential of six segregating populations derived from crosses involving a varying number of parents were field evaluated during Summer 2022 at the Experimental Plots of AICRP on Seed (Crops), University of Agricultural Sciences, Bangalore for ten quantitative traits. The breeding potential of six segregating populations was assessed based on three statistical parameters. Considering that different statistical parameters lead to the identification of the different populations with good breeding potential, the rank-sum method was employed as an objective criterion to identify populations with better breeding potential. Segregating populations derived from single cross hybrid; [BNG-3 × 40023] with lower rank-sum was considered to possess higher breeding potential followed by segregating populations derived from three-way cross hybrid; [(40225 × MAI-283) × 40224]. Segregating population derived from a three-way cross hybrid; [(40225 × MAI-283) × 40224] produced a high frequency of transgressive segregants for grain yield plant-1. These segregating populations could preferentially be advanced to isolate advanced breeding lines. Based on this study, the optimum number of parental lines determined to be involved in generating potential segregating populations was not more than three