| Title: | Combined effects of early season leaf removal and climatic conditions on aroma precursors in ‘Sauvignon blanc’ grapes |
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| Authors: | ID Sivilotti, Paolo, University of Udine (Author)
ID FALCHI, Rachele, University of Udine (Author)
ID Herrera, Jose Carlos, University of Udine (Author)
ID Škvarč, Branka, Univerza v Novi Gorici (Author)
ID Butinar, Lorena, Univerza v Novi Gorici (Author)
ID Sternad Lemut, Melita, Univerza v Novi Gorici (Author)
ID Bubola, Marijan, Institute of Agriculture and Tourism (Author)
ID SABBATINI, Paolo, Michigan State University (Author)
ID Lisjak, Klemen, Agricultural Institute of Slovenia (Author)
ID Vanzo, Andreja, Agricultural Institute of Slovenia (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| 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. |
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| Keywords: | early leaf removal, cluster exposure, thiol precursors, methoxypyrazines, glutathione S-transferase, Vitis vinifera |
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| Publication version: | Author Accepted Manuscript |
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| Year of publishing: | 2017 |
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| Number of pages: | 32 |
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| Numbering: | objava na spletni strani, v pripravi |
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| PID: | 20.500.12556/RUNG-3323 |
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| COBISS.SI-ID: | 4892155 |
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| DOI: | 10.1021/acs.jafc.7b03508 |
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| NUK URN: | URN:SI:UNG:REP:HIB0JKSX |
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| Publication date in RUNG: | 31.08.2017 |
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| Views: | 5667 |
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| Downloads: | 0 |
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