Abstract

SALMI, Manel et al. Generation means analysis of physiological and agronomical targeted traits in durum wheat ( Triticum durum Desf.) cross. Rev. Fac. Nac. Agron. Medellín [online]. 2019, vol.72, n.3, pp.8971-8981. ISSN 0304-2847.  https://doi.org/10.15446/rfnam.v72n3.77410.

Genetic parameters such as leaf relative water content, leaf chlorophyll content, plant height, above-ground biomass, harvest index, grain yield, and grain yield components of Bousselam/Mrb5 durum wheat (Triticum durum Desf.) cross were estimated based on generation means analysis. A, B, C, and D scaling and Chi-square (χ2) tests revealed the inadequacy of the simple additive-dominance model. This result suggests the presence of digenic epistasis for most studied traits; the duplicate epistasis was present for relative water content, above-ground biomass, and grain yield; and complementary epistasis was observed for chlorophyll content. Significant genotypic correlation coefficients appeared among grain yield, relative water content, and above-ground biomass. This suggests useful indirect selection criteria to improve simultaneously these traits, which showed significant heritability. It can be concluded that the traits investigated show a complex genetic behavior, which implies that early selection would be less efficient; therefore, it is recommended delaying the selection to advanced generations to benefit from the reduction of non-fixable genetic variation and exploit transgressive segregators due to the significant interaction additivity×additivity (i) of the gene and duplicated epistasis.

Keywords : Generation means analysis; Genotypic correlation; Heritability; Non-allelic interaction; Physio-agronomical traits; Triticum durum.

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