We present a theoretical proof that the ratio of the dominance vs. the additive variance decreases with increasing genetic divergence between two populations. While the dominance variance is the major component of the variance due to specific combining ability (sigma(SCA)(2)), the additive variance is the major component of the variance due to general combining ability (sigma(GCA)(2)). Therefor...

A study was conducted on maize incorporating a total of 28 single crosses, eight parental lines and two standard checks to determine the combining ability gene action. Among eleven traits that were studied, analysis variance revealed mean squares due genotypes, parents hybrids highly significant for all traits, except 100 grain weight in case parents, indicating presence an adequate amount gene...

general and specific combining ability of some rice lines and cultivars with irri sources were determined using the line × tester procedure (5 pure lines were crossed with 4 local cultivars as tester). parents and their progenies were planted in a randomized complete block design with three replications in the research field of iran rice research institute. traits such as yield and its componen...

Blackgram is the grain legume crop mainly grown in variable edaphic and weather conditions India resulting less productivity. However, yield of blackgram can be improved by breeding methods involving potential parents analysing combining ability. A set three female (CO 5, CO 6 ADT 5) six male (MASH 1008, VBN 6, 8, 9, 10 11) were used as parents. The crosses synthesised Line × Tester fashion the...

Selection of parents based on their combining ability is an effective approach in hybrid breeding. In this study, eight maintainer lines and nine restorer lines were used to obtain 72 crosses for analyzing the general combining ability (GCA) and special combining ability (SCA) for seven agronomic and yield characters including plant height (PH), spike length excluding awns (SL), inter-node leng...

Sorghum in Mexico ranks third grain production. This study aimed to estimate general combining ability (GCA) and specific (SCA) for commercial experimental sorghum parents hybrids. The was estimated using the line x tester method described by Kempthorne. experiment established during spring-summer 2018 cycle at INIFAP, Las Huastecas, México. It consisted of five lines, eight testers 40 hybrids;...

Proper understanding of the mode gene action in open-pollinated varieties (OPVs) maize parents helps breeder choice appropriate breeding method to improve its genetic value. The objectives present study were determine controlling grain yield and other agronomic traits late maturing elite OPVs classify into heterotic groups. Ninety-one hybrids generated from 14 OPV using diallel mating design ev...

Knowledge of quantitative genetic parameters is crucial in allocating resources for different steps of multistage selection programs. The main objective of the present study was to investigate the magnitude of variance of general combining ability (GCA) and specifi c combining ability (SCA) effects and their interaction with environments in wheat (Triticum aestivum L.). We used four data sets (...