Abstract

FELLAHI, Zine El Abidine et al. Genetic analysis of morpho-physiological traits and yield components in F ₂ partial diallel crosses of bread wheat (Triticum aestivum L.). Rev. Fac. Nac. Agron. Medellín [online]. 2017, vol.70, n.3, pp.8237-8250. ISSN 0304-2847.  https://doi.org/10.15446/rfna.v70n3.61927.

Wheat breeding in the semi-arid region of Algeria aims to develop new cultivars combining high productivity and good abiotic stress tolerance. Therefore, it is essential to understand the genetic control of these characteristics. Nine parents of bread wheat and 20 derived F2 hybrid populations developed in a partial diallel scheme (group 1 composed 5 parents and group 2 contained 4 parents) were evaluated with three replications at the Experimental Station of the National Agronomic Research Institute of Algeria (INRAA), Setif Unit, during the 2012-2013 crop season. Results of the diallel analysis, indicated that the components associated with additive effects were more relevant than those associated with the dominance effects for most of the studied traits. Based on the proportion between dominant and recessive genes in all parents, the dominant alleles were present in greater frequency in group 1. Values of the gene proportion with positive and negative effects in the parents revealed an unequal distribution of dominant genes in the parents for almost all the traits except for chlorophyll content and grain number per spike which showed a symmetric distribution. The average degree of dominance indicated over-dominance for most of traits, suggesting that selection for these traits, in early generations, will be less efficient.

Keywords : Breeding; Genetic parameters; Inheritance; Selection; Semi-arid.

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