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Characterization of Grape (Vitis vinifera L.) Berry Sunburn Symptoms by Reflectance.

Authors :
Rustioni L
Rocchi L
Guffanti E
Cola G
Failla O
Source :
Journal of agricultural and food chemistry [J Agric Food Chem] 2014 Apr 09; Vol. 62 (14), pp. 3043-3046. Date of Electronic Publication: 2014 Mar 27.
Publication Year :
2014

Abstract

Sunburn can affect grape quality both for chemical modifications and by visual impact of the browning. Optical properties of 17 white grape accessions were investigated in the visible region using a noninvasive instrument. Reflectance spectra were obtained using a Jaz System spectrometer. Browning was induced by exposing grape bunches to direct sunlight at 12:30 p.m. for 5 h. During the experiment, the global solar radiation ranged from 2.6 to 2.7 MJ m <superscript>-2</superscript> h <superscript>-1</superscript> and the air temperature from 24.3 to 29.2 °C; the exposed berries reached a temperature of 34.2 °C in comparison to the 30.4 °C of the shaded ones. Differences between the spectra of controlled and exposed berries mainly emphasized the loss in chlorophyll and the formation of brown compounds. A positive correlation between the chlorophyll concentration and berry browning was proposed. Developing rapid, noninvasive, and low-cost methods based on reflectance spectroscopy could support grapevine variety characterization with respect to sunburn susceptibility as well as study of the physiological processes involved in the symptoms' appearance.

Details

Language :
English
ISSN :
1520-5118
Volume :
62
Issue :
14
Database :
MEDLINE
Journal :
Journal of agricultural and food chemistry
Publication Type :
Academic Journal
Accession number :
24650184
Full Text :
https://doi.org/10.1021/jf405772f