TY - JOUR T1 - Effect of Cluster Thinning on Berry Skin Anthocyanin Composition of <em>Vitis vinifera</em> cv. Nebbiolo JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 224 LP - 226 DO - 10.5344/ajev.2002.53.3.224 VL - 53 IS - 3 AU - Silvia Guidoni AU - Pierpaolo Allara AU - Andrea Schubert Y1 - 2002/01/01 UR - http://www.ajevonline.org/content/53/3/224.abstract N2 - Cluster thinning (removal of 50% of the cluster one month after bloom) was tested for three consecutive years in a vineyard located in southern Piedmont (Italy). At harvest, concentrations of total anthocyanins and flavonoids were assessed by spectrophotometry and concentrations of individual anthocyanins were determined by high-performance liquid chromatography. Berry weight and berry skin weight slightly increased following thinning. Soluble solids and berry skin anthocyanins and flavonoids were more concentrated in berries from cluster-thinned plants. Cluster thinning increased the concentrations of cyanidin-3-glucoside, peonidin-3-glucoside, and, to a lesser extent, petunidin-3-glucoside. Concentrations of malvidin-3-glucoside and of acylated anthocyanins were not affected by cluster thinning. ER -