Genetic variability, character association and genetic divergence for seed quality traits in mungbean [Vigna radiata (L.) Wilczek]

Abstract

The present investigation was conducted on thirty genotypes of mungbean to evaluate genetic variability, character association and genetic divergence for eleven seed quality traits for the identification of most diverse and promising genotypes. The genotypes differed significantly for all characters under study. Higher genotypic and phenotypic coefficient of variation was observed for electrical conductivity test, germination after accelerating ageing (96 hr), seedling vigour index II and seedling dry weight. High heritability coupled with high genetic advance was recorded for seedling dry weight, seedling vigour index I, seedling vigour index II, electrical conductivity, germination after accelerating ageing (48 hr), germination after accelerating ageing (72 hr), germination after accelerating ageing (96 hr). Association analysis indicated that standard germination showed a significant and positive correlation with shoot length, root length, seedling length, seedling dry weight, seedling vigour index I, seedling vigour index II and germination after accelerating ageing (48, 72 and 96 hr). D2 analysis grouped 30 genotypes into 6 clusters. Cluster pattern revealed that cluster I and V were the largest ones with eight genotypes, followed by cluster III and VI with four genotypes and cluster II and IV with three genotypes each. The highest contribution toward the total genetic divergence was recorded for vigour index I, electrical conductivity, shoot length, root length and seedling dry weight. Selection index (I) aimed at selection on several characters simultaneously indicated that genotypes, LGG-460, MH-805, Pusa-0672, IPM-06-5, TBM-11, EC-581523, KM-2241, GP-69, RMG-991 and MH-934 had performed better and were important for further breeding programme aimed at improvement of yield.

Assessment of Water Stress Tolerance in Mungbean Induced by Polyethyline Glycol

“…Hence, cluster III and V might be considered better for choosing the parental genotypes used for hybridizing with the counterpart from cluster I those may generate novel recombinants with anticipated characters. These is also agreement with the findings of Garg, et al, 2017; Shweta, 2013; Uz-Zaman et al, 2013; Singh et al, 2009; Sarkar and Kundagrami, 2016 [22, 34, 35, 36, 37].…”

“…Narayanankutty et al 2003 [29] studied on thirty-seven vegetable cowpea genotypes for observed the genetic variability and divergence, and they obtained significant differences among the genotypes for all the recorded characters. High heritability coupled with high genetic advance was recorded for seedling dry weight, seedling vigor index of mungbean [22]. Johnson et al, 1955[30] state that heritability coupled with genetic advance would be more dependable and necessary in formulating the selection methods.…”

“…The minimum distance was observed between cluster II and IV (2.50) followed by clusters III and IV (2.81). This indicating that genotypes present in those clusters are closely related [22]. Thus, hybridization between genotypes of these clusters may not yield a high level of heterotic expression in the F1’s and variability in segregating progeny (F2) [33].…”

“…Hence, Parents could be selected based on larger inter-cluster distance to obtain novel recombinants in subsequent generations [33]. The maximum within-cluster distance (D=0.12) was recorded in Cluster II which was closely followed by cluster V (0.11) and cluster IV (0.10), and which indicate the existence of maximum differences among the genotypes that fall in these clusters [22].…”

Assessment of Nitrogen Fixation by Mungbean Genotypes in Different Soil Textures Using 15N Natural Abundance Method

“…Among genotypes, STB#122 and IC 8972-1 recorded the highest values across all comparisons, while 8735 was the lowest performing genotype. Variations in mungbean dry matter yields among genotypes could be attributed to genetic variation (Rahim et al 2010;Yimram et al 2009). A recent study (Diatta, unpublished data, 2019) documenting adaptation and performance of mungbean genotypes also reported that 8735 (1284 kg ha −1 ) and IC 8972-1 (739 kg ha −1 ) genotypes had higher dry matter yields than STB #122 (635 kg ha −1 ), 223 (156 kg ha −1 ), and Berken (441 kg ha −1 ) genotypes.…”