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  • Author or Editor: Yolanta Saks x
  • Journal of the American Society for Horticultural Science x
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In `Jonathan' apples grown in Israel, the incidence of senescent breakdown after 5 months of storage at 0C was not correlated with total or water-soluble Ca content at harvest. Likewise, no other assayed component of the water-soluble or total mineral content (P, Mg, K) of the fruit pulp at harvest correlated with the disorder after storage. After storage, a general decrease in the solubility of Ca was observed. However, this decrease was not uniform in all fruit and, as a result, the correlation between water-soluble and total Ca content, which was high at harvest, diminished after storage. Water-extractable Ca from stored fruit was negatively correlated and water-soluble K/Ca was positively correlated with the incidence of senescent breakdown, whereas total Ca was not correlated.

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A method was developed to determine the total Ca, Mg, and K content of apple (Malus domestica Borkh.) pulp based on an assay in the water-extractable fraction. Water-soluble and total levels of each of the three elements in the fruit correlated significantly (P < 0.001) at harvest. The method is accurate (cv = 4.1%, 4.1%, and 2.5% for Ca, Mg, and K, respectively) and time-saving. The total level of minerals determined by the method proposed correlated well (P < 0.001) with that obtained by acid digestion of freeze-dried apple pulp.

Open Access