Back to Search
Start Over
Characterization of Grape (Vitis vinifera L.) Berry Sunburn Symptoms by Reflectance.
- 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