Sugar and acid concentrations associated with several qualitative traits in unselected Prunus persica x P. davidiana progenies.

摘要

Five qualitative traits, peachectarine, white/yellow flesh, freestone/clingstone, speckledon-speckled skin and red fleshon-red flesh colour were studied in terms of their relationships to sugar and acid concentrations in an unselected Prunus persica x P. davidiana population in 2001 and 2002. Mean sucrose, sorbitol, total sugar, quinate and total acid concentrations and soluble solids content of nectarine genotypes were significantly higher than those of peach genotypes in both years. Mean sucrose, sorbitol, total sugar concentrations and soluble solids content in genotypes with skin speckles were significantly higher than those in genotypes without skin speckles. Skin speckle had no obvious effect on mean acid concentrations in both years. There were few significant differences in mean sugar and acid concentrations between yellow- and white-fleshed, freestone and clingstone, or red flesh and non-red flesh coloured genotypes in both years. The five qualitative traits are discussed from a breeding point of view.