Metabolic response to two hydrocooling temperatures in sweet cherries cv Lapins and cv Sunburst.

摘要

Physiological and metabolic characterisation and analysis of response to two hydrocooling temperatures in cv Sunburst (early season) and cv Lapins (mid-season) cherries during post-harvest life has been studied. Samples were hydrocooled with water at 1 degrees C to reach 6 degrees C inside the fruit (HC-6C) and 2 degrees C (HC-2C) inside the fruit. After harvesting, Sunburst samples presented higher respiration rates and lower malic acid and sorbitol contents than Lapins. Glucose and fructose contents were similar in the two varieties. Sunburst control exhibited a higher respiration rate than Lapins and a higher rate of conversion from sorbitol to fructose. The change of glucose and malic acid consumption over 4 days at 20 degrees C was similar for the two varieties. Hydrocooling reduced respiration and the consumption of respiratory substrates. The residual effect of hydrocooling was especially significant in cherries of both varieties that had been pre-cooled to 2 degrees C. Hydrocooling delayed loss of skin and pulp firmness, and reduced loss of titratable acid and soluble solid contents over 4 days at 20 degrees C in both varieties. Hydrocooling to 2 degrees C checked loss of quality with respect to controls for both varieties after 4 days at 20 degrees C. Lapins showed better conservation properties than Sunburst under all the experimental storage conditions. Hydrocooling reduced total losses in both varieties, especially in cherries pre-cooled to 2 degrees C. Hydrocooling also had several residual effects: reduction of the respiration rate and consumption of respiratory substrates, and slowing of loss of quality, particularly for Lapins..