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

被引：47

作者：

Rustioni, Laura ^{[1
]}

Rocchi, Letizia ^{[1
]}

Guffanti, Eugenio ^{[1
]}

Cola, Gabriele ^{[1
]}

Failla, Osvaldo ^{[1
]}

机构：

[1] Univ Milan, CIRIVE, I-20133 Milan, Italy

来源：

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY | 2014年 / 62卷 / 14期

关键词：

Vitis vinifera; white grapes; browning symptoms; melanin-like pigments; sun exposure; PIGMENT CHANGES; ANTHOCYANIN; LIGHT; FRUIT;

D O I：

10.1021/jf405772f

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

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.

引用

页码：3043 / 3046

页数：4