TY - JOUR T1 - Integration of Nondestructive Techniques with Destructive Analyses to Study Postharvest Water Stress of Winegrapes JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 57 LP - 65 DO - 10.5344/ajev.2009.60.1.57 VL - 60 IS - 1 AU - Andrea Bellincontro AU - Isabella Nicoletti AU - Massimiliano Valentini AU - Alejandro Tomas AU - Diana De Santis AU - Danilo Corradini AU - Fabio Mencarelli Y1 - 2009/03/01 UR - http://www.ajevonline.org/content/60/1/57.abstract N2 - Red Cesanese grapes were harvested at 21 Brix. Berries were destemmed manually and placed in perforated plastic trays inside a small ventilated tunnel at 10°C with 1.5 m/sec of air flow, 10°C with 2.5 m/sec of air flow, and 20°C with 1.5 m/sec of airflow as a control. Relative humidity was 45%. The experiment was stopped at 20% berry weight loss, after 26, 22, and 16 days for 10°C at 1.5 m/sec, 10°C at 2.5 m/sec, and 20°C at 1.5 m/sec, respectively. Sugar content rose to 24–25 Brix. Carbon dioxide production from chilled berries under a higher air flow rate was constantly higher (~30%) than at a lower ventilation, and similar to that of the 20°C sample. Berries lost firmness (higher deformation), increased hue angle, and decreased chroma, regardless of treatment. Berries kept at a higher flow rate had magnetic resonance images similar to those of the berries kept at 20°C, with diffuse dark areas in the mesocarp. Analysis of alcohol dehydrogenase in the direction of the oxidation of ethanol to acetaldehyde revealed significantly higher activity at 20°C than at 10°C at 20% of weight loss, and ethanol was lower. The fluorescence (Fα) pattern confirmed a different stress rate depending on temperature and flow rate. Near-infrared–acousto-optic tunable filter (NIR–AOTF) analysis revealed a different absorbance level at a specific wavelength range depending on the treatment and the rate of weight loss. A significant decrease in polyphenols occurred in 10°C samples. Flavonols and stilbenes increased significantly at 20°C, confirming a supposed higher rate of water stress at 20°C. ER -