Impacts of photoselective bunch zone shading on the volatile composition and sensory attributes for <i>Vitis vinifera</i> L. cv. Riesling

Photoselective shading is a process that modulates the radiation intensity in specific regions of electromagnetic spectrum. It common practice horticulture to manipulate plant physiological responses, but date has only received minimal attention viticulture. The potent odorant 1,1,6-trimethyl-1,2-dihydronaphthalene (TDN) particular relevance for aged Riesling wine, which are also known be impacted by magnitude bunch zone light exposure during berry development. Hence, this study, effect photoselective on formation TDN wine was investigated across two consecutive growing seasons. Applying red, black or green shade cloth (SC) provided unique environments and yielded distinct differences grape composition compared with unshaded control. Overall, through effective reducing overall photosynthetically active control photoselectivity SC treatments differently affected number measures. Fruit yield somewhat not significantly lower under treatments, while juice pH increased grapes grown both vintages Both sugar accumulation (P = 0.035) ammonia nitrogen 0.043) showed evidence treatment effects, although low F-statistics (4 3, respectively). Measures hydrolytically released free concentrations were treatments. Unexpectedly, sensory descriptive analysis wines demonstrated ‘kerosene-like’ aroma consistently associated wine. In summary, an method manipulating outcomes may aid overcoming viticultural obstacles quality impacts climate change.