The thermal increase, due to the changed climatic context, is leading to marked variations in the yield and quality of the grapes and causing an increase in the use of water resources in several viticultural areas. Nevertheless, in some environments, rainfalls are scarce and there is no water availability. In this study, we compared the impact of low water irrigation volumes (DI, replacement of 70% of crop evapotranspiration) with respect to non-irrigated vines (NI), on the physiological, yield and qualitative performances of near-isohydric variety ‘Montepulciano’, trained to overhead trellis system, which requires a high-water supply. The stomatal conductance and photosynthesis values, in basal and median leaves, were higher in DI vines. All NI leaves suffered water stress, showing in the youngest leaves (position 20 and 25 along the main shoot) higher carbon isotope discrimination (δ¹³C) (− 25.38‰ and 25–25.77‰, respectively). At harvest, DI vines showed yield higher of 30% and 33% than NI vines in 2005 and 2006, respectively, and 18% in 2007. In environments with prolonged water shortage and low water resource, near-isohydric ‘Montepulciano’ vines, trained to overhead trellis system and irrigated with limited volumes, determined a significant improvement of ‘vineyard efficiency’ with a yield of 19.2 t/ha with respect to 13.4 t/ha of NI vines, ensuring also more sugar content (+ 31%), anthocyanin concentration (+ 13%) and polyphenolic substances (+ 8%) than NI vines.

由于气候环境的变化，热量的增加导致葡萄的产量和品质发生明显变化，并在多个葡萄栽培地区引起水资源利用的增加。但是，在某些环境中，降雨稀少，并且没有水。在这项研究中，我们比较了低水灌溉量（去离子水，替代了70％的作物蒸散量）相对于非灌溉藤本（NI）对近等水度品种'Montepulciano'的生理，产量和定性性能的影响。 '，受过架空网格系统训练，需要大量供水。DI葡萄的基叶和中叶的气孔导度和光合作用值较高。所有NI叶片都遭受了水分胁迫，¹³ C）（分别为− 25.38‰和25–25.77‰）。在收获时，DI葡萄的产量分别比2005年和2006年的NI葡萄分别高30％和33％，以及2007年的18％。在缺水持续时间长，水资源匮乏的环境中，受过近等渗处理的“ Montepulciano”葡萄被训练在架空格架系统上进行灌溉并限制灌溉量，相对于13.4吨/公顷的NI葡萄藤而言，“葡萄园效率”得到了显着提高，产量为19.2吨/公顷，还确保了更多的糖含量（+ 31％），花色苷浓度（+ 13％）和多酚类物质（+ 8％）高于NI葡萄藤。