Genetic Architecture of Secondary Yield Components in Mungbean (Vigna radiata (L.) Wilczek).

Abstract

Triple Test Cross (TTC) analyses were carried out to detect epistasis, and to estimate additive and dominance components of genetic variation in two seasons (kharif and spring/summer) for branches per plant, pod clusters per plant, pods per cluster, pod length, biomass, and harvest index in mungbean. The results revealed the absence of epistasis for all the traits in the kharif season but in contrast the presence of epistasis for pod clusters per plant and biomass in the spring/summer season. The partitioning of total epistasis revealed that both i type (additive × additive), and j and l type (additive × dominance, and dominance × dominance) interactions were significant with predominance effect of i type for pod clusters per plant and biomass. The additive and dominance gene effects were highly significant for branches per plant, pod length, and harvest index in both seasons; for pod clusters per plant and biomass in the kharif season; and for pods per cluster in spring/ summer season. The magnitude of additive variance was higher for all these traits in both seasons except for pods per cluster and pod length in the spring/summer season, which exhibited a higher value of dominance than additive variance. The direction of dominance was observed towards fewer pod clusters per plant, small pod size, and high harvest index. The predominance of i type interaction and additive gene action for most of the traits in the present investigation suggests the occurrence of selection in the late generations in the segregating population for the improvement of seed yield through yield components in mungbean.

Appraisal of gene action for indeterminate growth in mungbean [Vigna radiata (L.) Wilczek]

“…The environment could fluctuate the plant height and its degree of indeterminations but with nominal impact. Genotypic × environmental interaction and its involvement in the inheritance were also reported by Deswal et al (1996) in wheat and Khattak et al (2002a) in mungbean. Additive genetic variance played a vital role in the inheritance of investigated traits, might be due to high narrow sense heritability (h${}_{\text{F}2}^2$ and h${}_{\text{F}\propto }^2$) estimates.…”

Epistatic effects on grain yield of soybean [Glycine max (L.) Merrill]

“…Perkins and Jinks (1971) stated, for plant height in tobacco, that i type epistasis (additive x additive) is more sensitive to environmental effects than j type epistasis (additive x dominant). Variations in the pattern of epistasis x environment interaction between different traits were also reported by Khattak et al (2002).…”

“…The occurrence of epistasis for GY using the TTC or Modified TTC designs has been reported for other species, e.g., wheat (Ketata et al 1976, Singh 1981, maize (Wolf andHallauer 1997, Parvez et al 2006), mung bean (Khattak et al 2001, Khattak et al 2002, cotton (Silva andAlves 1983, Bhatti et al 2006), peanut (Upadhyaya and Nigam 1999), rice (Saleem et al 2005, Subbsaraman andRanagasamy 1989), flax (Sood et al 2007), common bean (Moreto et al 2012), soybean (Barona et al 2009), and Arabidopsis thaliana (Kusterer et al 2007). Interestingly, most of these studies were published in recent years.…”

Inheritance pattern of mungbean yellow mosaic disease resistance and gene action for different traits in mungbean (Vigna radiata (L.) Wilczek) under protected and unprotected field conditions

“…It was observed that inheritance and genes were in repulsion phase for SYPP; therefore, selection should be delayed to later generations under both regimes. The additive, dominance and nonallelic interaction have also been reported for these traits in mungbean (Khattak, Ashraf, & Zamir, 2004;Khattak, Haq, Ashraf, Jabbar, & Zamir, 2002;Ram, 1997;Singh & Singh, 1996). PL showed similar behaviour under both field conditions with respect to genetic components, and it was controlled by both additive and nonadditive gene effects; therefore, selection should be delayed to later generations under both regimes.…”