The analysis of the combining ability of stem height in barley hybrid

Abstract

Diallel crossing of five divergent cultivars of the two-row barley (Vafa, Djerdap, NS-293, Jagodinac and Sladoran) gave 10 F₁ and F₂ hybrids for studying variability, the mode of inheritance, gene effects, heriatbility and the abilities of plant height.

The significance test of the mean values of the generation related to the parental mean was used to assess the mode of inheritance (Kraljevic-Balalic, 1991), and the analysis of variance of the combining abilities made following the method 2, mathematical model I, for the incomplete dialel (Griffing, 1956).

The inheritance of plant height is partially dominant, dominant or superdominant, with prevalence of the partial dominance in the majority of the combinations.

The values of heritabiltiy were found to range from 35,25% to 72,85%. For plant height, the highest genetic difference between the cultivars was exhibited in the combination Jagodinac x Sladoran , with heritability amounting to 72,85%.

Highly significant differences for the general (GCA) and specific (SCA) combining ability in the F₁ and F₂ generation denoted that plant height had resulted from the genes with additive and non-additive, i.e. dominant impact. The variance of GCA was found to be higher in the F₁ and F₂ generation than that of SCA.