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Taste and Appearance in the Supply Chain, Where to Start? Spatial Distribution of Colour, Sugars and Acids in Growing Apples

Author:
Sadar, N., Tijskens, L. M. M., Urbanek Krajnc, A., Tojnko, S., Unuk, T.
Source:
Acta horticulturae 2015 no.1091 pp. 21-28
ISSN:
0567-7572
Subject:
Malus domestica, apples, biopsy, citric acid, color, cultivars, fructose, glucose, spatial distribution, sucrose, supply chain, taste, trees
Abstract:
Samples were taken from apple flesh while at the tree (‘Gala’ and ‘Pinova’) using a biopsy sampling system. After sampling the wound was closed with vaseline, which prevented wound responses. Samples were taken at different times over the circumference of the apples (at about 70° above the equator) to monitor the spatio-temporal distribution of acids (malic, citric, fumaric) and sugars (glucose, fructose and sucrose). At the same time the skin colour was assessed with a Minolta colour meter at the same location. The distribution over the circumference of the apples revealed for both cultivars a sinusoidal pattern for all colour aspects and for citric acid, while only fructose in ‘Gala’ showed a clear sinusoidal pattern. For all other variables measured, the pattern was only faint, with a low amplitude. Although the system is still prone to a large measuring error, biopsy sampling is a powerful tool to study the spatio-temporal distribution of taste components.
Agid:
4813346