Background and Aims Some grapevine cultivars such as Malbec have unstable yield, due to poor fruitset or fruitlet abscission. The phenomenon is known as ‘shatter’ and this study aims to explore the potential of applying the shoot girdling technique at flowering, to direct the carbohydrate partitioning towards inflorescences and reduce shatter. Methods and Results Fruitful Malbec shoots were girdled above the apical bunch, below the basal bunch, double girdled or not girdled (Control) during 2017 and 2018. Most vegetative growth parameters were unaffected, but shoots widened and the leaf expansion improved in the fruit zone. Fruitset doubled compared to that of the Control, ovary abortion was reduced, and fruit yield increased, mainly due to a greater number of small berries in the base and double girdled treatments. In addition, base girdling increased TSS per berry, reducing the concentration of phenolic substances in the normal size berries. Girdling effects were consistent during both seasons. Conclusions Shoot girdling below the basal bunch proved to be effective in reducing shatter. The increase in carbohydrate supply available to the inflorescences during flowering was able to augment their weak sink strength relative to the perennial organs. Significance of the Study The study contributes to an understanding of the importance of the photoassimilates flow towards inflorescences in reducing shatter and increasing yield in Malbec vines.

中文翻译：

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开花时环抱枝条可减少葡萄树品种的破碎。马尔贝克

背景和目标 一些葡萄品种，如马尔贝克，由于坐果差或落果，产量不稳定。这种现象被称为“破碎”，本研究旨在探索在开花时应用枝条环剥技术的潜力，将碳水化合物分配到花序并减少破碎。方法和结果 2017 年和 2018 年间，马尔贝克多果枝条在顶端束以上、基部束以下、双环带或不环带（对照）。大多数营养生长参数不受影响，但枝条变宽，果实区的叶片扩张得到改善. 与对照相比，坐果增加了一倍，子房流产减少，果实产量增加，主要是由于基部和双环处理中的小浆果数量增加。此外，基部环剥提高了每个浆果的 TSS，降低了正常大小浆果中酚类物质的浓度。两个季节的环带效果都是一致的。结论 基团下方的芽环被证明能有效减少碎裂。开花期间花序可用碳水化合物供应的增加能够增强它们相对于多年生器官的弱汇强度。研究的意义 该研究有助于理解光同化物流向花序在减少马尔贝克葡萄藤的破碎和增加产量方面的重要性。结论 基团下方的芽环被证明能有效减少碎裂。开花期间花序可用碳水化合物供应的增加能够增强它们相对于多年生器官的弱汇强度。研究的意义 该研究有助于理解光同化物流向花序在减少马尔贝克葡萄藤的破碎和增加产量方面的重要性。结论 基团下方的芽环被证明能有效减少碎裂。开花期间花序可用碳水化合物供应的增加能够增强它们相对于多年生器官的弱汇强度。研究的意义 该研究有助于理解光同化物流向花序在减少马尔贝克葡萄藤的破碎和增加产量方面的重要性。