Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 494726
Title Non-destructive harvest measurement can predict rate of softening of fast- and slow-melting peaches
Author(s) Eccher Zerbini, P.; Weksler, A.; Lurie, S.; Friedman, H.
Source Acta Horticulturae 1084 (2015). - ISSN 0567-7572 - p. 829 - 834.
Department(s) Horticulture and Product Physiology Group
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) Biological shift factor - Chlorophyll - I<inf>AD</inf> - Modeling - Prunus persica - Ripening

Peaches are harvested selectively based on size and color, both peel background color and extent of blush. The background color of the fruit changes from green to yellow as chlorophyll disappears, and in many cultivars with red coloration this is hard to determine. A portable instrument that measures IAD (the index of absorbance difference between 670 and 720 nm) was used for monitoring the progression of ripening in two peach cultivars. IAD was measured at harvest in 'Oded' (an early season, fast melting flesh peach) and 'September Snow' (a late season, slow melting flesh peach). After harvest the fruits were divided into comparable lots and held at 20°C. The IAD and firmness were measured daily on a different lot. Two analytical methods were applied to the data. In the first, firmness decrease during shelf life was analyzed by nonlinear regression, using the IAD measured at harvest to determine the maturity of the fruit, and to estimate the biological shift factor (BSF) which is related to the biological age of fruit. In the second, a prediction equation for firmness was developed as a function of initial IAD, giving a table of the probability of a fruit to be less than 20 N on each day of shelf life. In both these methods the measurement of IAD at harvest could be used to separate fruit into different groups according to their rate of softening, and, therefore, potential shelf life.

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