ISHS Acta Horticulturae 326: International Symposium on Pre- and Postharvest Physiology of Pome-fruit
ATTEMPTS AT PREDICTING STORAGE ABILITY OF APPLES |
| Authors: | K. Tomala, W. Myga, J. Kobylinska |
| Abstract:
Fruits of four apple cultivars: ‘Cortland’, ‘Gloster’, ‘Lobo’ and ‘Spartan’ sampled in orchards of Central Poland were studied. The mineral element content of fruitlets, leaves and fruits after harvest was determined. The incidence of bitter pit-like symptoms provoked by infiltration with magnesium chloride was positively correlated with the ratio of K/Ca in ‘Cortland’ and ‘Gloster’ fruits; the coefficient of determination was 41% and 44%, respectively. Fruits developed from late blooming flowers were considerably smaller than those from earlier bloom. They produced less ethylene, exhibited a lower starch index; this indicates that fruits developed from flowers of a protracted bloom period should be harvested at least twice. Besides, in most of the cultivars under study a significant correlation between the starch index and internal ethylene concentration was found; hence the starch index may be a good criterion for determination of optimum harvest time. | |
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