Sugar and Acid Content and Their Genotypic Correlations of Unselected P.persica x P.davidiana Progenies as Affected by Hairness and Flesh Color

摘要

Fruit sugar and acid content were determined in a group of hybrids from one family,including 22 peach and 85 nectarine genotypes, or 75 white-fleshed and 32 yellow-fleshedgenotypes. Sucrose accounted for about 65% of the total sugar, and malate for about 50%of the total acid. Mean sucrose, fructose, sorbitol, total sugar, soluble solid andquinate content were significantly higher in nectarines than in peaches, while nosignificant difference was found in mean malate, citrate and total acid content betweennectarines and peaches. Shikimate content was very low and ranged from 0.011-0.046 meq100 g-1 FW in all genotypes studied. Flesh color did not affect sugar and acid content.Glucose and fructose had a close positive correlation (r =0.63***). Malate had positivecorrelations with sucrose, sorbitol, total sugar and soluble solid content. The correlationbetween citrate and sugars were not significant. Glucose, fructose, sorbitol and malatecontent seemed to be higher in late-maturing genotypes. Sucrose, total sugar and totalacid content had a parabolic relationship with developmental period (from full bloomingdate to maturity date).