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2. Combined effects of early season leaf removal and climatic conditions on aroma precursors in Sauvignon blanc grapesPaolo Sivilotti, Branka Škvarč, Lorena Butinar, Melita Sternad Lemut, Klemen Lisjak, Andreja Vanzo, 2017, izvirni znanstveni članek Povzetek: 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.
Ključne besede: early leaf removal, cluster exposure, thiol precursors, methoxypyrazines, Vitis vinifera
Objavljeno v DiRROS: 06.09.2022; Ogledov: 194; Prenosov: 98
 Povezava na celotno besedilo |
3. Enhancement of Istrian Malvasia wine aroma and hydroxycinnamate composition by hand and mechanical leaf removalMarijan Bubola, Igor Lukič, Sanja Radeka, Paolo Sivilotti, Kristina Grozić, Andreja Vanzo, Dejan Bavčar, Klemen Lisjak, 2019, izvirni znanstveni članek Ključne besede: wine aroma, leaf removal, varietal thiols, aroma compounds, hydroxycinnamates
Objavljeno v DiRROS: 11.05.2020; Ogledov: 1832; Prenosov: 993
 Celotno besedilo (868,34 KB) |
4. Yield reduction through cluster or selective berry thinning similarly modulates anthocyanins and proanthocyanidins composition in Refosco dal peduncolo rosso (Vitis vinifera L.) grapesPaolo Sivilotti, Rachele Falchi, Joshua Vanderweide, Paolo Sabbatini, Marijan Bubola, Andreja Vanzo, Klemen Lisjak, Enrico Peterlunger, Jose Carlos Herrera, 2020, izvirni znanstveni članek Ključne besede: Grapevine, Yield reduction, Selective thinning, Tannins, Anthocyanins, vinska trta, grozdje, pridelek, redukcija pridelka, redčenje, tanini, antociani, kemična sestava
Objavljeno v DiRROS: 06.05.2020; Ogledov: 1559; Prenosov: 156
Datoteka (1,07 MB) |
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