O'Brien Patrick, Collins Cassandra, De Bei Roberta
Waite Research Institute, School of Agriculture, Food and Wine, The University of Adelaide, PMB 1, Glen Osmond, SA 5064, Australia.
ARC Industrial Transformation Training Centre for Innovative Wine Production, Waite Research Institute, PMB 1, Glen Osmond, SA 5064, Australia.
Plants (Basel). 2021 May 19;10(5):1017. doi: 10.3390/plants10051017.
Under the effects of climate change, it is becoming increasingly common to observe excessively fast grape sugar accumulation while phenolic and flavour development are lagging behind. The aim of this research was to quantify the impacts of three different leaf removal techniques on the canopy architecture and ripening of Cabernet Sauvignon trained in a sprawl trellis system. Treatments were performed at veraison (~14 °Brix) and included (i) control; (ii) leaf plucking in the bunch zone; (iii) leaf plucking the top two-thirds of shoots, apical to the bunches; and (iv) shoot trimming. On the date of harvest, no significant difference in total soluble solids was observed between treatments. Other results including the effect of the treatments on fruit acidity, anthocyanins, phenolics, and tannins were somewhat inconclusive. While various other studies have shown the potential of leaf removal to achieve slower grape sugar accumulation without affecting the concentration of anthocyanins, phenolics, and tannins, the results of this study do not indicate a decrease in the rate of grape sugar accumulation as a result of the investigated defoliation techniques. Given the cost of implementing these treatments, the results of this study do not support the use of these methods for the purpose of delaying fruit ripening in a hot Australian climate.
在气候变化的影响下，葡萄果实中葡萄糖积累过快而酚类物质和风味物质发育滞后的现象越来越普遍。本研究的目的是量化三种不同的摘叶技术对采用蔓延式棚架系统栽培的赤霞珠葡萄树冠结构和成熟度的影响。处理在转色期（约14°波美度）进行，包括：（i）对照；（ii）摘除果穗部位的叶片；（iii）摘除果穗上方三分之二的新梢顶部叶片；（iv）新梢修剪。在收获当天，各处理间总可溶性固形物含量未观察到显著差异。包括处理对果实酸度、花青素、酚类物质和单宁的影响在内的其他结果有些不确定。虽然其他各种研究表明，摘叶有可能在不影响花青素、酚类物质和单宁浓度的情况下减缓葡萄糖积累速度，但本研究结果并未表明所研究的摘叶技术会降低葡萄糖积累速度。考虑到实施这些处理的成本，本研究结果不支持在澳大利亚炎热气候条件下为延迟果实成熟而使用这些方法。
