Generation mean analysis for estimating some genetic parameters in four bread wheat crosses

Abstract: The present study was carried out at Sakha Agricultural Research Station, ARC during 2013/14 to 2016/17 growing seasons. The aim was to investigate the gene mode of action and inheritance pattern of yield traits for use as indicators of high grain yield in four bread wheat crosses, namely Giza 171 x Vorobey, Gemmeiza11x Vorobey, Sids12 x Vorobey and Line 1 x Vorobey. Analysis of variance showed significant differences among the generation means for all studied traits. Scaling test showed that most studied characteristics were significant, indicating the presence of non-allelic interactions. Dominance gene effects were generally higher in magnitude than those of additive ones in the four crosses, indicating that dominant genes play an important role in the inheritance of such traits beside the additive one. Significant positive heterotic and inbreeding depression values were detected for grain weight and number of spikes per plant with the highest heritability and genetic advance, especially in cross3 (Sids12 x Vorobey). Partial-dominance was detected for days to maturity and 100-kernel weight and days to heading traits, however over-dominance towards the higher parent (Vorobey) was detected for plant height, number of spikes per plant, number of kernels per spike and grain weight per plant. All crosses gave high negative effect of the additive x additive to most of the traits, indicating that the materials used in this study had a decreasing allele expression, making the improvement of these traits in early generations ineffective. Based on these results, the studied crosses would be of interest in a breeding program for genetic improvement of wheat yield with delaying the selection to later segregating generations.
Publication year 2018
Pages 17-29
Organization Name
Author(s) from ARC
Publication Type Conference/Workshop