Vol. 78 No: 4

Title:
Fruiting position, mineral concentration and incidence of physiological pitting in 'Hayward' kiwifruit

Authors:
T. G. THORP, I. B. FERGUSON, L. M. BOYD and A. M. BARNETT

pp: 505-511

Abstract:
'Hayward' kiwifruit (Actinidia deliciosa (A. Chev) C. F. Liang et A. R. Ferguson) were sampled to identify populations of fruit with differing fruit mineral concentrations and levels of the storage-related disorder physiological pitting. Fruit were taken from different shoot types at different locations within vines. Fruit from short shoots near the tips of canes, in an area of the vine with low leaf:fruit ratios, had low fruit calcium concentrations and more pitting. In contrast, fruit from long shoots and with high leaf:fruit ratios near the base of canes, had high concentrations of calcium and less pitting. At the more distal positions along canes in an area of the vine with low leaf:fruit ratios, increasing leaf:fruit ratios on individual fruiting shoots led to higher inflow of calcium to the fruit. No such relationship was found when fruit were sampled from shoots near the base of canes, an area of the vine with relatively high leaf:fruit ratios. Inconsistent relationships were found between fruit soluble solids concentrations and calcium, probably due to different mobility of calcium and carbohydrates within the vines. Fruiting position and the associated leaf area are a source of variability in mineral concentrations of fruit, and by consequence, in the incidence of physiological pitting in 'Hayward' kiwifruit, and should be considered when developing sampling techniques.

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