20.500.12556/RUNG-3323
Combined effects of early season leaf removal and climatic conditions on aroma precursors in ‘Sauvignon blanc’ grapes
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.
early leaf removal
cluster exposure
thiol precursors
methoxypyrazines
glutathione S-transferase
Vitis vinifera
true
true
false
Angleški jezik
Ni določen
Delo ni kategorizirano
2017-08-31 08:29:35
2017-08-31 09:18:40
2023-06-09 03:21:19
0000-00-00 00:00:00
2017
0
0
32
objava na spletni strani, v pripravi
2017
0000-00-00
PostprintKoncna
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
4892155
10.1021/acs.jafc.7b03508
URN:SI:UNG:REP:HIB0JKSX
Univerza v Novi Gorici
0
1
0