Actinidia deliciosa (C.F. Liang et A. R. Ferguson L.) mature plants trained to “Pergola” system were grown in a semiarid environment located in Southern Italy. During the growing season measurements were carried out on sap-flow of canes grown in different light exposure (exposed and shaded) using the heat-balance method. The exposed condition (> 40% daily available PPFD) was maintained through summer pruning, while the shaded one (< 20% daily available PPFD) was obtained using a shading-net; meteorological data were recorded, too. At the end of growing season, calcium and potassium accumulation in leaves, fruits and shoots of exposed and shaded canes were determined. Throughout the season the sap-flow of shaded canes was on average 45% of the exposed one. At the end of growing season differences in calcium content were found in different organs of exposed and shaded canes. The calcium concentration in exposed and shaded leaves was about 3 g m-2 and 1.5 g m-2 respectively, while in fruit the concentration was 0.2 % D.M and 0.11% D.M. for exposed and shaded fruits. The results obtained indicate that a high level of light availability determine an increase in xylem stream in canes which is responsible for the increase of calcium accumulation in different organs. Besides this increase of fruit transpiration rate can improve fruit storage quality.
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