<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The optimal harvest date of nectarines can no longer be based on the colour since newer cultivars have an intensive blush, even in the unripe stage. Measuring the absorption of the fruit flesh by Time Resolved Spectroscopy (TRS) at 670 nm, provide information on the ripening stage and the variation in ripening stages of batches of fruit. Since each individual fruit is harvested and measured at some arbitrary stage of development, the analysis of the data gathered was based on the system of the biological shift factor (Tijskens <italic>et al.</italic> 2005) applying non-linear mixed effects regression analysis. The results show that μa, and therefore also the fruit flesh colour and chlorophyll content, change according a sigmoidal pattern, which was approximated with a symmetrical logistic function. The explained parts obtained (R2adj) were about 0.97 for storage at 20°C and about 0.86 at 10°C. The rather large variation on apparent behaviour between individual fruit, each with its own stage of development, was nicely taken care of by the system of the biological shift factor. During ripening, the distribution of the biological shift factor was constant and normal, while the distribution of μa changed. Also that change in distribution over time is nicely described by the system and models used.</abstract>

The optimal harvest date of nectarines can no longer be based on the colour since newer cultivars have an intensive blush, even in the unripe stage. Measuring the absorption of the fruit flesh by Time Resolved Spectroscopy (TRS) at 670 nm, provide information on the ripening stage and the variation in ripening stages of batches of fruit. Since each individual fruit is harvested and measured at some arbitrary stage of development, the analysis of the data gathered was based on the system of the biological shift factor (Tijskens et al. 2005) applying non-linear mixed effects regression analysis. The results show that μa, and therefore also the fruit flesh colour and chlorophyll content, change according a sigmoidal pattern, which was approximated with a symmetrical logistic function. The explained parts obtained (R2adj) were about 0.97 for storage at 20°C and about 0.86 at 10°C. The rather large variation on apparent behaviour between individual fruit, each with its own stage of development, was nicely taken care of by the system of the biological shift factor. During ripening, the distribution of the biological shift factor was constant and normal, while the distribution of μa changed. Also that change in distribution over time is nicely described by the system and models used.

Biological Variation in Ripening of Nectarines

Horticultural Production Chains Group, Wageningen UR, Wageningen, the Netherlands

Agrotechnology & Food Innovations, Wageningen UR, Wageningen, the Netherlands

CRA-IVTPA Istituto sperimentale per la Valorizzazione Tecnologica dei Prodotti, Agricoli, Milan, Italy

Journal of Fruit and Ornamental Plant Research

{"article-title":"Biological Variation in Ripening of Nectarines"}

The optimal harvest date of nectarines can no longer be based on the colour since newer cultivars have an intensive blush, even in the unripe stage. Measuring...

Biological Variation in Ripening of Nectarines

Pubblicato online: 07 set 2007

Pagine: 205 - 212

DOI: https://doi.org/10.2478/v10032-007-0023-7

Parole chiave
harvest maturity, flesh colour, non-destructive measurement technique, biological variation, modelling

This content is open access.

Biological Variation in Ripening of Nectarines

Pubblicato online: 07 set 2007

Pagine: 205 - 212

DOI: https://doi.org/10.2478/v10032-007-0023-7

Parole chiaveharvest maturity, flesh colour, non-destructive measurement technique, biological variation, modelling

This content is open access.

Parole chiave
harvest maturity, flesh colour, non-destructive measurement technique, biological variation, modelling