PJB-2019-641
EVALUATION OF GENETIC VARIABILITY AND SOME GENETIC PARAMETERS FOR YIELD AND RELATED TRAITS IN MUNG × MASH RECOMBINANTS AND SELECTION OF PROMISING GENOTYPES
Ghulam Abbas
Abstract
Seventy two Mung × Mash recombinant genotypes were developed at NIAB through hybridization between mungbean and mashbean varieties which were used in present study. All the genotypes were evaluated in the field in a triplicate block design for seed yield and its components traits. Highly significant differences were observed among the genotypes. The magnitudes of genotypic and phenotypic coefficients of variability ranged from 2.73% to 28.97% and 3.46% to 31.95%, respectively. Pods plant-1 exhibited maximum amount of genetic variability followed by clusters plant-1 and seed yield plant-1. The estimates of broad sense heritability ranged from moderate to high and 100-seed weight was observed to be the most heritable trait with greatest magnitude (h2 = 99%). Pods plant-1 had maximum positive and significant genotypic (rg = 0.90) and phenotypic (rp = 0.86) correlations with clusters plant-1. Both traits were identified as the most important characters as they had strong genetic and phenotypic relationships with seed yield. Hence, due consideration must be given to these two traits for the improvement of seed yield in mungbean. Selection for number of pods per plant among different agronomic traits showed greatest improvement in seed yield that was 54% of the improvement possible through direct selection for seed yield. Likewise, clusters per plant and plant height followed pods per plant and also showed higher improvement in seed yield through indirect selection which was 29% and 20% of the improvement possible by direct selection for yield. Days to flowering also showed promise for 8% of the improvement in seed yield possible through direct selection for seed yield. Thirty six promising recombinants were selected on the basis of desirability index. The aggregate index score of desirability ranged from 4 to 13 and the genotype, MMH 11534 was at the top followed by MMH 53105. Nine genotypes possessed index score value of 9, eighteen genotypes were found to have index score of 8, eighteen genotypes exhibited 7, thirteen genotypes had 6, 11 genotypes got 5 and one had 4. On the basis of overall performance seven recombinant genotypes, viz; MMH 1115, MMH 4224, MMH 4255, MMH 7124, MMH 2112, MMH 4295 and MMH 2225 were observed to be more prominent and hence these were selected as elite lines. Considering the worth of these elite lines, it was suggested that these may be used for further evaluation in different trials for the release of new commercial cultivars. Selection on the basis of number of clusters per plant, pods per plant, and plant height was very effective for yield improvement in mungbean.
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