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 °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.
Characterization of grape (Vitis vinifera L.) berry sunburn symptoms by reflectance / L. Rustioni, L. Rocchi, E. Guffanti, G. Cola, O. Failla. - In: JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY. - ISSN 0021-8561. - 62:14(2014), pp. 3043-3046.
|Titolo:||Characterization of grape (Vitis vinifera L.) berry sunburn symptoms by reflectance|
RUSTIONI, LAURA (Corresponding)
ROCCHI, LETIZIA (Secondo)
COLA, GABRIELE (Penultimo)
FAILLA, OSVALDO (Ultimo)
|Parole Chiave:||Vitis vinifera; white grapes; browning symptoms; melanin-like pigments; sun exposure|
|Settore Scientifico Disciplinare:||Settore AGR/03 - Arboricoltura Generale e Coltivazioni Arboree|
|Progetto:||Combining innovation in vineyard management and genetic diversity for a sustainable European viticulture|
|Data di pubblicazione:||2014|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1021/jf405772f|
|Appare nelle tipologie:||01 - Articolo su periodico|