Vol. 80 No: 1

Title:
Water relations in fruit, leaves and stems of two apple cultivars that differ in susceptibility to watercore

Authors:
H. YAMADA, T. MORITA and S. AMANO

pp: 70-74

Abstract:
The intensity of watercore in apple (Malus domestica Borkh.) cv. 'Orin' increased from July to August when maximum air temperatures were above 30°C, then decreased as temperatures decreased and fruit ripened. In cv. 'Fuji', there was only a low incidence of the disorder in November and December. Tissue water potential (Ψ) was similar in the inner and outer flesh. Predawn and midday fruit decreased during fruit development and was lower in 'Orin' than in 'Fuji'. Midday Ψ_leaf and Ψ_stem were higher in 'Orin' in late August and September.The gradient of midday Ψ between leaves or stems and fruit became positive earlier in 'Orin' than in 'Fuji'. Soluble solids content (SSC) was also higher in 'Orin' than in 'Fuji'. Seasonal fluctuations in sorbitol in 'Orin' paralleled the incidence of watercore and gradually increased during fruit development in 'Fuji'.These results suggest that immature 'Orin' fruit have more favorable water relations than 'Fuji', resulting in a greater incidence of watercore.

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