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ISHS Acta Horticulturae 682: V International Postharvest Symposium

EFFECTS OF DIFFERENT FRUIT CALCIUM LEVELS ON THE POSTHARVEST PHYSIOLOGY OF PLUMS (PRUNUS DOMESTICA L.)

Authors:   A.E. Rato, H.I. Marreiros, A.C. Santos, J.M. Barroso
Keywords:   acidity, ethylene production, soluble solids contents, texture
Abstract:
Plum fruits (Prunus domestica L. cv. 'Raínha Claudia Verde' ) were grown in a calcareous soil (more fertile) and in a schistose soil (less fertile) with two types of rootstocks characterized by different vigour. The influence of the rootstock in fruit calcium concentration was investigated. More vigorous rootstock produced fruits with lower calcium content than those produced by less vigorous rootstock. This effect was more evident in fertile soils. The postharvest behaviour of fruits with higher and lower calcium content was also monitored. Changes in texture and chemical composition of pulp fruits (acidity, soluble solids content, and ethylene evolution) during cold storage (0-2°C) were determined. Ethylene production rate was studied in fruits after cold storage (10, 17, 24, 31, 38 days). Fruits with higher calcium content showed higher firmness values and lower ethylene production rates as compared with fruits with lower calcium content.
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