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Title:Combined effects of early season leaf removal and climatic conditions on aroma precursors in ‘Sauvignon blanc’ grapes
Authors:Sivilotti, Paolo (Author)
FALCHI, Rachele (Author)
HERRERA, Jose Carlos (Author)
Škvarč, Branka (Author)
Butinar, Lorena (Author)
Sternad Lemut, Melita (Author)
Bubola, Marijan (Author)
SABBATINI, Paolo (Author)
Lisjak, Klemen (Author)
Vanzo, Andreja (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Early leaf removal around the cluster zone is a common technique applied in cool climate viticulture, to regulate yield components and improve fruit quality. Despite the increasing amount of information on early leaf removal and its impact on total soluble solids, anthocyanins and polyphenols, less is known regarding aroma compounds. In order to verify the hypothesis that defoliation, applied before or after flowering, could impact the biosynthesis of thiol precursors, we performed a two year (2013 and 2014) experiment on Sauvignon blanc. We provided evidence that differential accumulation of thiols precursors in berries is affected by the timing of defoliation and this impact was related to modifications in biosynthetic pathway. Furthermore, the possible interaction between leaf removal treatment and seasonal weather conditions, and its effect on the biosynthesis of volatile precursors are discussed. Our results suggested that in Sauvignon blanc the relative proportion of 4-S-glutathionyl-4-methylpentan-2-one (G-4MSP) and 3-S-glutathionylhexan-1-ol (G-3SH) precursors can be affected by defoliation, and this could be related to the induction of two specific genes encoding glutathione-S-transferases (VvGST3 and VvGST5), while no significant effects on basic fruit chemical parameters, polyphenols and methoxypyrazines were ascertained under our experimental conditions.
Keywords:early leaf removal, cluster exposure, thiol precursors, methoxypyrazines, glutathione S-transferase, Vitis vinifera
Year of publishing:2017
Number of pages:32
Numbering:objava na spletni strani, v pripravi
COBISS_ID:4892155 Link is opened in a new window
URN:URN:SI:UNG:REP:HIB0JKSX
DOI:10.1021/acs.jafc.7b03508 Link is opened in a new window
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
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Record is a part of a journal

Title:Journal of Agricultural and Food Chemistry
Publisher:American Chemical Society
ISSN:0021-8561
Year of publishing:2017

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