Determination and Analysis of Main Fruit Inclusions of Different Varieties of Prunus avium

Differences in the soluble protein, Vc, total soluble sugar and acidity contents of post-harvest fruit among seven main production cultivars of Prunus avium Linn.,Lapins, Stella, Sunburst, Van, Germersdorfer, Hedelfinger and Burlat, were investigated.The bivariate correlations between main fruit inclusions and fruit developmental periods and fruit size or between the factors of the main fruit inclusion were analysed. The result showed that the correlation between fruit developmental phases and fruit soluble protein content and total soluble sugar content was positively significant. This meant that soluble protein and total sugar contents in the fruit of early ripening sweet cherry variety with a shorter fruit developmental phase were significantly (P0.05) lower than the of middle and late ripening sweet cherry varieties with a longer fruit developmental periods. The fruit soluble protein concentrations in the fruit of sweet cherry varieties with a moderately high fruit quality classification standard ranged from 1052.0 to 1119.3 mg·100g~(-1)FW. The Vc concentrations in the fruit of sweet cherry varieties with a moderately highfruit quality classification standard ranged from 9.89 to 18.01 mg·100g~(-1)FW. The difference of total acidity contents in fruit between any two sweet cherry varieties was significant (P0.05). The correlation between fruit sugar-acid ratio and fruit developmental period and total soluble sugar content was positively significant. The sugar-acid ratio could be used as an index accurately to evaluate fruit flavor and Quality. The sugar-acid ratios in the fruit of sweet cherry varieties with a moderately high fruit quality classification standard ranged from 31.37 to 40.54. Comparatively speaking, the fruit size of early ripen sweet cherry varieties was significantly smaller than those of middle and late ripen sweet cherry varieties (P0.05).