期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 62, 期 14, 页码 3043-3046出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf405772f
关键词
Vitis vinifera; white grapes; browning symptoms; melanin-like pigments; sun exposure
资金
- European Community [FP7-311775]
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(-2) h(-1) and the air temperature from 24.3 to 29.2 degrees C; the exposed berries reached a temperature of 34.2 degrees C in comparison to the 30.4 degrees 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.
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