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An innovative use of DA-meter for peach fruit postharvest management

Spadoni, A., Cameldi, I., Noferini, M., Bonora, E., Costa, G., Mari, M.
Scientia horticulturae 2016 v.201 pp. 140-144
Monilinia, absorbance, cultivars, ethylene production, firmness, fruits, near-infrared spectroscopy, peaches, plant rots, postharvest technology, ripening, shelf life, storage time, total soluble solids
The DA-meter is a hand-held instrument developed from vis/NIR spectroscopy that measures the index of absorbance difference (IAD) correlated with the flesh chlorophyll-α content of fruit. It was used to divide in two different ripening classes, class I (climacteric peak) and class II (onset of climacteric), harvested fruit belonging to three peach cultivars. At harvest and after 6 days of storage at 20°C, quality parameters such as flesh firmness (FF), soluble solid contents (SSC), ethylene emission and brown rot incidence were evaluated. Data on ethylene production reported a different emission of phytormone at harvest relating to peach variety and among the two IAD classes. In addition, the IAD values showed a high correlation with FF, while SSC being ethylene-independent did not show marked differences between ripening stages. With respect to brown rot, after 3 days of shelf-life, data from artificial infections, revealed a lesion diameter significantly larger on fruits of class I (10 and 13mm) than those on class II (8 and 9mm) for ‘Springbelle’ and ‘Redhaven’, respectively. Similarly, in all trials, the incidence of Monilinia rots in fruit natural infected was significantly higher within class I compare to class II. The present work showed the possibility of sorting asymptomatic fruit, harvested at a commercial maturity, by DA-meter, into two IAD classes that will show different brown rot incidence during storage.