Components of Genetic Variation for Response to Late Leaf Spot and RustAmong the Near Isogenic Lines Derived from Heterogeneous Inbred Families in Groundnut (Arachis hypogaea L.)

Lines breeding true for reaction to LLS and rust, were selected from the heterogeneous inbred families of TAG 24 × GPBD 4 and TG 26 × GPBD 4. True breeding lines with contrasting phenotype for rust and LLS were maintained separately in two Sets (I and II). In total, 30 rust resistant and 34 rust susceptible true breeding lines formed Set I. Similarly, 21 LLS resistant and 25 LLS susceptible true breeding lines constituted Set II. There was at least one resistant and one susceptible true breeding line isolated from each HIF of both the crosses based on rust and LLS reaction. Pooled ANOVA for the six seasons showed significant genotypic differences for most of the traits. High magnitude of PCV and GCV coupled with high heritability and genetic advance as per cent of mean for response to rust and LLS at 80 and 90 DAS was recorded. Lines originating from the common HIFs differed significantly for rust resistance in Set I, and for LLS resistance in Set II. But, the lines belonging to the same HIF were on par for majority of agronomic and productivity traits. Since the magnitude of PCV and GCV for agronomic and productivity traits like number of primary branches, plant height, leaf length, leaf width, pods yield per plant, shelling percent and sound mature kernel percent was low and there was no significant differences among the NILs of both the sets.