1. High spatial heterogeneity of water stress levels in Refošk grapevines cultivated in Classical KarstFrancesco Petruzzellis, Sara Natale, Luca Bariviera, Alberto Calderan, Alenka Mihelčič, Jan Reščič, Paolo Sivilotti, Katja Šuklje, Klemen Lisjak, Andreja Vanzo, Andrea Nardini, 2022, original scientific article Keywords: Classical Karst, water status, drought stress, grape quality, phenolic profile, vitis vinifera
Published in RUNG: 11.11.2021; Views: 2848; Downloads: 0
This document has many files! More... |
2. Combined effects of early season leaf removal and climatic conditions on aroma precursors in ‘Sauvignon blanc’ grapesPaolo Sivilotti, Rachele FALCHI, Jose Carlos Herrera, Branka Škvarč, Lorena Butinar, Melita Sternad Lemut, Marijan Bubola, Paolo SABBATINI, Klemen Lisjak, Andreja Vanzo, 2017, original scientific article 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
Published in RUNG: 31.08.2017; Views: 4991; Downloads: 0
This document has many files! More... |
3. Vpliv vinogradniških tehnologij na vsebnost metabolitov v grozdju sorte ‘Modra frankinja’Ana Marija Tomše, 2015, undergraduate thesis Abstract: V grozdju sorte ‘Modra frankinja’ (Vitis vinifera L.), vinorodni okoliš Dolenjska, smo
leta 2013 preučevali vpliv vinogradniških tehnologij: odstranjevanja listov v predelu
grozdja (razlistanja) pred fazo cvetenja in redčenja grozdja v fazi vèraison v primerjavi
s kontrolo. Grozdje smo vzorčili teden pred trgatvijo, v času trgatve in teden po tem. V
svežem grozdnem soku smo določili vsebnost suhe snovi, skupnih titrabilnih kislin in
pH-vrednost. Vsebnost in profil antocianov smo določili v metanolnih ekstraktih
grozdnih kožic s pomočjo tekočinske kromatografije visoke ločljivosti. Redčenje
grozdja v fazi vèraison je vplivalo na statistično značilno večje povprečne: mase kožic,
vsebnosti suhe snovi in pH-vrednosti v primerjavi z razlistanjem pred fazo cvetenja ob
času trgatve in teden po tem, medtem ko se kontrola ni statistično značilno razlikovala
od redčenja grozdja. Razlike v povprečni masi grozdja in vsebnosti skupnih titrabilnih
kislin med tehnologijami niso bile statistično značilne ob nobenem terminu vzorčenja.
Povprečna vsebnost skupnih monomernih antocianov v grozdju je bila ob času trgatve
največja pri redčenju grozdja v fazi vèraison, vendar razlike med tehnologijami niso bile
statistično značilne. Malvidin 3-glukozid je najbolj zastopan antocian pri sorti ‘Modra
frankinja’. Lastnost sorte je tudi manjša vsebnost acilatov od kumaratov. Redčenje
grozdja v fazi vèraison je najbolj vplivalo na izboljšano kakovost grozdja glede na
spremljane parametre.
Keywords: ‘Modra frankinja’ (Vitis vinifera L.), odstranjevanje listov pred fazo
cvetenja, redčenje grozdja v fazi vèraison, antociani, profil antocianov.
Published in RUNG: 15.09.2015; Views: 8650; Downloads: 313
 Full text (3,95 MB) |
4. |
5. |
