In 2003 and 2004 the volume of 'Jonagold' and 'Gala Must' (Malus domestica Borkh.) apple fruitlets and their concentrations of starch, amylose and amylopectin were assessed at two -week intervals. The investigations started in the 7th or 8th week after full bloom (WFB) and continued until harvest. 'Gala Must' apples contained, on average, about 40% more starch than 'Jonagold' apples. The dominant starch form was amylopectin; its maximum content was 68% in 'Jonagold' and 63% in 'Gala Must' apples. The dynamics of the changes of the starch content and its components, in growing and maturing apples, revealed considerable differences in both years of the experiment. In 2003, the highest starch accumulation occurred in the 7th WFB for both apple cultivars, whereas in 2004, fruits of 'Jonagold' showed the highest starch accumulation in the 14th week, and those of 'Gala Must' in the 12th week. At this stage, apple fruit volume was 2.5 times smaller in 2003 than in 2004. It seems that higher than average temperatures at that time were the main factor determining considerable enhancing of starch accumulation in apple fruitlets in 2003. In both years, the period of starch breakdown in 'Jonagold' apples was two weeks shorter than in 'Gala Must' apples.
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