Row orientation effects on chemical composition and aromatic profile of Syrah winter wines

Abstract Sunlight and heating influence leaf and grape metabolism and therefore wine quality. As a recent management tool, no information exists on the effects of grapevine row orientation on the wine composition of Syrah vines within the context of double pruning management, a technique used to transfer the grape harvest from the wet summer to the dry winter season. This is a first attempt to investigate the wine composition from north-south- (NS) and east-west- (EW) oriented Syrah winter vines. EW wine samples had higher total acidity, residual sugars, alcohol and color hue, whereas NS wines exhibited higher content of color intensity, anthocyanins, total phenolics, total phenolic index, ashes and pH. The identification of volatile compounds was tentatively performed and demonstrated the presence of alkanes, volatile phenols and alkyl sulfide in NS wines, while butyrolactone and beta-damascenone were found mainly in EW wines. Row orientation contributed to wine composition and could be used as a management tool for obtaining individual wine styles.

摘要 光照与热量会影响叶片与葡萄的代谢过程，进而决定葡萄酒的品质。作为一种新兴的葡萄园管理手段，目前尚无关于双修剪管理模式下（该技术可将葡萄收获期从多雨夏季转移至干旱冬季），葡萄种植行朝向对西拉（Syrah）葡萄所酿葡萄酒成分影响的相关研究。本研究首次探究了南北向（NS）与东西向（EW）种植的西拉葡萄经双修剪后所酿葡萄酒的成分差异。东西向种植组的葡萄酒样品具有更高的总酸度、残糖含量、酒精度与色泽色调；而南北向组的葡萄酒则表现出更高的颜色强度、花青素、总酚类物质、总酚指数、灰分含量与pH值。研究对挥发性化合物进行了初步鉴定：南北向组葡萄酒中检出烷烃、挥发性酚类与烷基硫化物，而东西向组则主要含有丁内酯与β-大马士酮（beta-damascenone）。种植行朝向会显著影响葡萄酒成分，可作为实现个性化葡萄酒风格的葡萄园管理手段。