Data for the Study of the Metabolism of Apples During Growth and Storage

Sugar Composition of Varietal Juices Produced from Fresh and Stored Apples

“…A sizeable decrease in sucrose and in most cases small increases in glucose and fructose contents during storage of apples have been reported in the literature (Evans, 1928;Griffiths et al, 1950;Kidd et al, 1952;Telegdy Kováts and Lindner, 1961;Gorin, 1973; Hansen and Rumpf, 1979;Trautner and Somogyi, 1979). The significant increase in xylose content can be explained by the breakdown of cell-*, **, ***, significant at the p < 0.05, 0.01, and 0.001 confidence level, wall components.…”

Organic Acid Accumulation in Attached and Detached Tomato Fruits1

“…An increase of organic acids in detached fruits has been reported only infrequently (27). Titratable and total acidity decreased in oranges (11), grapefruits (13), apples (12,15,18), strawberries (16), and 'Conference' pears (17) harvested at the ripe or mature stage. However, lemon fruits stored at 13 or 24°C after commercial harvest showed a rapid increase in titratable acidity (8).…”

“…Lemon fruits are usually harvested while titratable acidity is increasing or nearly maximum (24), whereas orange fruits are usually harvested when titratable acidity is decreasing (23). Apples (12,18), strawberries (16), and 'Conference' pears (17) are also picked at the stage when acidity tends to decrease, and all decrease in titratable acidity after detachment. It appears that organic acid metabolism in these fruits continues after detachment as at the time of detachment.…”

“…Such a situation does not hold for immature apples, 'Bart lett' pears, or cherries. Increased acidity in detached fruits of apple has never been reported even when picked as small as 13 g (12), although the titratable or total acidity of apples on the tree does increase during early stages of growth (14,18). 'Bart lett' pears, which increased in titratable acidity after detach ment, were not picked at the stage when titratable acidity was increasing (19).…”