Fixed effect genetic analysis of a diallel cross in dry beans (Phaseolus vulgaris L.)

Abstract

A full diallel cross among four diverse homozygous strains of dry edible beans (Phaseolus vulgaris L.) was evaluated for yield, protein content, and culinary quality traits in the F2 and F3 generations in two locations. Interpretation of diallel effects [Method 1 Model I] using a fixed-effect genetic model made it possible to combine data from two generations into a single analysis and quantify the relative contributions of additive and dominance genetic effects to general (GCA) and specific (SCA) combining abilities. GCA was found to arise from three potential sources: additive effects, dominance interactions at homozygous loci, and average dominance interactions in hybrids involving the parent in question. SCA was found to be a function solely of dominance. Additive effects were the primary determinant of GCA and were highly significant. Specific dominance interactions were significant for seed yield, cooked bean moisture content, and texture but not for protein content. Texture was the only trait for which the additive-dominance model failed to provide an adequate fit to the data, suggesting that texture is significantly affected by epistatic interaction. One cross ('Brazil-2' × 'Sanilac') was identified that exhibited a large heterotic effect for seed yield although the parents' additive effects were nonsignificant. Such a "nicking" effect was attributed to complementation between the two parents.

Assessment of heterotic potential and combining ability of immortal restorer lines derived from an elite rice hybrid, KRH-2, for the development of superior rice hybrids

“…It was interesting to note that, these three cross combinations demonstrated high SCA effects and low GCA value for both the parents. Higher SCA values may be due to over dominance, non-allelic gene interaction i.e., of dominance × dominance type as delineated by [73]. Therefore, as suggested by [3], in order to produce heterotic F 1 s, selection of parents with diverse GCA effects i.e.…”

Heterosis, Combining Ability and Their Inter-Relationship for Morphological and Quality Traits in Yellow Maize (Zea mays L.) Single-Crosses Across Environments

“…The high SCA effects derived from crosses including good×poor general combiner parents (Dey, Singh, Bhatia, Parkash, & Chandel, 2014;Milić et al, 2011) may be ascribed to favorable epistatic effects of poor general combiner and Copyright © 2020 Universitas Brawijaya additive effects of the good general combiner parent. Low×low crosses that produces the high SCA effects (Chigeza, Mashingaidze, & Shanahan, 2014;Dey, Singh, Bhatia, Parkash, & Chandel, 2014), it's may be related to dominance×dominance type of nonallelic gene interaction creating over dominance thus being non-fixable (Wassimi, Isleib, & Hosfield, 1986). The non-fixable could be shown by the high yield of such crosses, and its could be exploited by heterosis breeding.…”

Determining genetic combining ability, heterotic potential and gene action for yield contributing traits and Yellow Vein Mosaic Virus (YVMV) resistance in Okra (Abelmoschus esculentus(L.) Monech.)

“…Conversely, test cross combination consisting of both poor combiner parents sometimes also exhibited high SCA value which was observed in hybrid DOV-2 × Pusa Sawani for days to 50% flower that showed both high SCA effect and the mean value. High SCA effect derived from poor × poor parental combination might be due to the prevalence of non-allelic interaction in the form of dominance × dominance type of epistatic gene action (Wassimi et al ., 1986). A significant value of the SCA effect for most of the characters was also revealed by several other workers in okra (Kumar et al ., 2010; Khatik et al ., 2013).…”