ABSTRACT

Girdling is an ancient agronomic technique that causes a change in the distribution of photosynthates, mineral nutrients and plant hormones. The aim of this study was to assess the effect of girdling technique on ‘Italia’ and ‘Victoria’ table grape cultivars. In this study, the carpological, physico-chemical and sensory data were evaluated. In order to assess the effect of girdling on grape volatile compounds, a headspace solid-phase microextraction was also performed. Results showed the effects of girdling on morphological, physico-chemical and sensory characteristics of table grapes with a different change of berry size and colour depending on the cultivar. The girdling treatment produced a significant decrease of sugar content and total soluble solids/titratable acidity ratio only for ‘Italia’ cultivar. The analysis of volatile compounds revealed that ‘Italia’ cultivar had three more compounds than ‘Victoria’ and that the samples taken from the girdled grapevines had fewer compounds than their ungirdled ones. The results exhibited that the girdling treatment was more effective on the ‘Italia’ cultivar. This study showed that girdling efficacy strongly depends on the cultivar. The samples from the girdled grapevines had fewer volatile compounds than the ungirdled ones. The Principal Component Analysis totally differentiated both cultivar and treatment without overlap.

摘要

环剥是一种古老的农艺技术，它会导致光合产物、矿物质营养素和植物激素的分布发生变化。本研究的目的是评估环剥技术对“意大利”和“维多利亚”鲜食葡萄品种的影响。在这项研究中，对 carpological、物理化学和感官数据进行了评估。为了评估环剥对葡萄挥发性化合物的影响，还进行了顶空固相微萃取。结果表明，环剥对鲜食葡萄的形态、理化和感官特性有影响，且果实大小和颜色的变化因品种而异。环剥处理仅对'Italia'品种产生了糖含量和总可溶性固体/可滴定酸度比的显着降低。对挥发性化合物的分析表明，'Italia' 品种比 'Victoria' 多含有三种化合物，而且从带环葡萄藤中采集的样品比未带环葡萄藤的样品含有更少的化合物。结果表明环剥处理对'Italia'品种更有效。这项研究表明，环剥效果在很大程度上取决于品种。环切葡萄藤的样品比无环切葡萄藤的挥发性化合物更少。主成分分析完全区分了品种和处理，没有重叠。这项研究表明，环剥效果在很大程度上取决于品种。环切葡萄藤的样品比无环切葡萄藤的挥发性化合物更少。主成分分析完全区分了品种和处理，没有重叠。这项研究表明，环剥效果在很大程度上取决于品种。环切葡萄藤的样品比无环切葡萄藤的挥发性化合物更少。主成分分析完全区分了品种和处理，没有重叠。