Abstract
Using potted peach (Prunus persica Batsch.) trees at the fruit maturation stage, fruiting effects on sorbitol and starch contents in leaves from day to night as well as before and after fruit removal were examined. Sorbitol content per unit fresh weight in leaves before fruit removal increased significantly during the day ; it decreased at night. Within one day after fruit removal, sorbitol increased to a level greater than that before fruit removal, whereas the decrease at night did not differ significantly between before and after fruit removal. The diurnal changes in starch content of the leaves exhibited a similar pattern to those of sorbitol before fruit removal. Likewise, within one day after fruit removal, starch content increased during the day to a higher level but the decrease at night was smaller compared to the level before fruit removal.
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