Levels and Sites of Metabolically Active Calcium in Apple Fruit1

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Abstract
Detectable calcium accumulation of the tissue started at 10−3M of the bathing solution and increased with increasing concentrations thereafter. Calcium solutions of 10−3 to 10−1M were effective in inducing metabolic changes in tissue: they decreased respiration and increased protein synthesis. Much of the accumulated Ca (90%) could be exchanged from the tissue with Mg without changing the metabolic effect of the Ca. Although high concentration of Ca was needed to move metabolically active Ca into the site of its action, most of the Ca accumulated on exchange sites was metabolically inactive.

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