GENETIC MODEL ANALYSIS OF THE CHARACTERISTIC AROMATIC SUBSTANCE 2E, 6Z-NONADIENAL IN CUCUMBER

Abstract

Six generations of P 1 , P 2 , F 1 , BC I , BC 2 and F 2 from the cross of cucumber cultivar EP326 and DE843 were employed to analyze the genetic effects of the characteristic aromatic substance 2E,6Z-nonadienal by using of the mixed major gene and polygene inheritance model. B-1 model, the additive-dominance-epistasis genetic model, which was controlled by two pairs of major genes, was the best one for genetic analysis of the characteristic aromatic substance 2E,6Z-nonadienal in cucumber. The additive effect values of two pairs of major genes were 3.07, and 3.06, dominant effect values were -1.98, and -1.96, and dominant degree were -0.64, and -0.64, respectively. The heritabilities of the major genes in BC 1 , BC 2 and F 2 were 56.96, 17.36, and 47.99%, respectively. The genetics of the characteristic aromatic substance 2E, 6Z-nonadienal in cucumber could be explained mainly by additive effects. Therefore, the strategy of cross breeding could be effective for increasing the characteristic aromatic substance 2E,6Z-nonadienal content of cucumber.