Glycosylated Aroma Compound Responses in 'Riesling' Wine Grapes to Cluster Exposure and Vine Yield

被引:24
|
作者
Meyers, James M. [1 ]
Sacks, Gavin L. [2 ]
Vanden Heuvel, Justine E. [1 ]
机构
[1] Cornell Univ, New York State Agr Expt Stn, Dept Hort, Geneva, NY 14456 USA
[2] Cornell Univ, New York State Agr Expt Stn, Dept Food Sci, Geneva, NY 14456 USA
关键词
1,1,6-trimethyl-1,2-dihydronaphthalene; C13; norisoprenoids; canopy architecture metrics; monoterpenes; phenolics; Vitis vinifera; CABERNET-SAUVIGNON; FLAVOR PRECURSORS; MONOTERPENES; MICROCLIMATE; MUSCAT; BERRY;
D O I
10.21273/HORTTECH.23.5.581
中图分类号
S6 [园艺];
学科分类号
0902 ;
摘要
Concentrations of aroma precursor compounds in 'Riesling' wine grapes (Vitis vinifera) are reported to correlate with fruit zone cluster exposure, although optimal cultural influences with respect to exposure timing and canopy assessment methods have not been established. To determine the impact of cluster exposure on concentrations of potential aroma compounds, correlations between light exposure metrics during the growing season and relative concentrations of eight representative aroma compounds at harvest were determined. The aroma compounds were carbon-13 (C13) norisoprenoids [1,1,6-trimethyl-1,2-dihydronaphthalene (TDN), beta-damascenone, and vitispirane], monoterpenes (linalool oxide, alpha-terpineol), and phenolics (4-vinylguaiacol, vanillin and eugenol). Cluster exposure was determined using metrics of varying spatial precision [percent interior cluster (PIC), cluster exposure layer (CEL), ln(CEL), cluster exposure flux availability (CEFA), and the percent ambient photosynthetic photon flux (PPF)] at two sites and two phenological stages (fruit set and veraison) in two consecutive seasons (2008 and 2009). Pairwise combinations of cluster exposure metrics and compounds resulted in 360 permutations, of which 22 were significant. Response data suggested that none of the compounds studied respond to variable cluster exposure levels below 20% of ambient sunlight (CEFA < 0.2), and that low cluster exposure may be particularly effective in minimizing C13 norisoprenoid concentrations at harvest. Yield components were also tested but found to have lower R-2 values compared with cluster exposure metrics. Active canopy management, in which vine vigor and fruit exposure are independently controlled, is likely to be more effective in influencing potential aroma compounds than selectively harvesting for naturally occurring variation in cluster exposure. In comparing the relative predictive strength among metrics, CEPA congruent to ln(CEL) > CEL > PIC congruent to percent PPF, suggesting that cluster exposure metrics with greater spatial sensitivity are more effective for establishing light response curves.
引用
收藏
页码:581 / 588
页数:8
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