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International Journal of Modern Agriculture, Volume 8, No.2, 2019
ISSN: 2305-7246
Inheritance of gene action for yield component traits in bread wheat under
normal and drought stress conditions.
El-Sherbeny, G. A. R., Khaled, G. A. A., and Haitham, M. A. Elsayed*.
Dept. of Genetics, Fac. Agric.,
Sohag University, Sohag 82786, Egypt.
*Corresponding author (e-mail:
dhaithamm@agr.sohag.edu.eg)
Abstract
Twenty eight half diallel crosses among eight diverse parental genotypes
of bread wheat were evaluated. The main objective of this study is to
identify the gene action of inheritance for the yield component traits.
The results demonstrated that, the mean squares of all studied traits were
highly significant under normal, drought stress and combined data. The
majority of cross combinations had positive significant heterosis over
better parent under each environment and combined data, reflecting the
prevalence of heterotic effects and non-additive effects.
Non-additive gene action (σ2D)
was found to play the major role in the inheritance of studied traits
under each environment and their combined data. The parents P1,
P3, P6, P7 and P8 were the
best general combiner for all the studied traits under the two
environments and combined data. The promising crosses which showed
desirable specific combining ability (SCA) effects gave also high estimate
of useful heterosis.
Keywords;
Wheat, drought stress, yield component traits, heterosis, half diallel
analysis.
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