Genetic Variability, Heritability and Genetic Advance in Mungbean (Vigna radiata L. Wilczek) Accessions

Abstract

The present study was conducted to assess the magnitude of genetic variability, heritability in broad sense and genetic advance among thirteen mung bean accessions for growth and grain yield characters. The study was conducted at the Haramaya University Rare research site and Hirna research site during the 2012/2013 cropping season. Randomized Complete Block Design with three replications was used for both locations. Each genotype was planted on a 1.2 X 2m plot consisting of four rows, which accommodates ten plants per row and thus 40 plants per plot. The result showed that number of primary branches, pods per plant, seeds per plant and harvest index had high genotypic and phenotypic coefficients of variation at both locations. For all characters, phenotypic coefficient of variation was higher than genotypic coefficient of variation indicating that there was environmental influence on these traits. The combined results for heritability showed that the high estimates of heritability and genetic advance were scored for seeds per plant and seed yield indicating that these characters were under the control of additive genetic effects. High genetic advance expected as percent of mean coupled with high heritability was observed for number of primary branches at Hirna, number of seeds per plant at Rare and number of secondary branches, pods per plant and 100seed weight for combined analysis. The present findings could be useful for establishing selection criteria for high seed yield in the mung bean breeding.

Genetic Variability, Correlation and Path Analysis in Mungbean [Vigna radiata (L.) Wilczek]

“…This suggested the preponderance of additive gene action with low environmental influence for the determination of these characters and could be effective in phenotypic selection. Similar results were obtained by Hemavathy et al, (2015) for plant height, seed yield per plant and number of pods per plant, Pandey et al, (2007) for plant height, seed yield per plant and harvest index, Degefa et al, (2014) for seed yield per hectare and pods per plant, Rao et al, (2007) Singh et al, (2009) for days to 50% flowering and days to maturity. Contrary to this Rao et al, (2006) and reported high heritability and low genetic advance for days to maturity.…”

Assessment of Water Stress Tolerance in Mungbean Induced by Polyethyline Glycol

“…The estimated data revealed that the PCV was higher than the GCV for all the studied traits which indicate that there was some environmental influence on these traits. These results were also line with the findings of Khajudparn and Tantasawat, 2011; Garg et al, 2017; Garje et al, 2013; Gadakh et al,, 2013; Kumar et al, 2013; Degefa et al, 2014 [21–26]. The lowest values of PCV and GCV in respective traits followed by the higher values, indicating these to be the lowest variable characters [27].…”

“…The results exhibited moderate to high heritability (24.26%-99.19%) along with moderate genetic advances for the majority of the characters which offer to chances expected response to selection. The characters which exhibited high heritability indicates that the selection will be more effective whereas the traits showing low heritability indicates that the selection will be affected by the environmental factors [26]. The high heritability of a trait also indicated that this trait was control by the additive genetic effects.…”

“…Johnson et al, 1955[30] state that heritability coupled with genetic advance would be more dependable and necessary in formulating the selection methods. An estimate of heritability is essential for applying the optimum breeding strategy [26]. Thus, heritability regulate the skill of selection, though the usefulness of selection for a particular trait depends on both the relative extent of genetic and environmental factors which reflex of phenotypic differences among genotypes in a population [26].…”

“…The lowest (0.340) was in RDW. Degefa et al, 2014 [26] mention that the minimum value of genetic advance derives from a low score of phenotypic variance or observed as a result of non-additive gene action which have epistatic and/or dominance effects. An increase in the magnitude of genetic advance across the water stress gradient indicated an increase in the inherent variation in the response of genotype to drought and a possibility of selection of suitable genotypes at higher water stress.…”