Articles
Berry aroma characteristics are affected by the timing and degree of water deficit in ‘Sangiovese’ grapevines
Article number
1409_54
Pages
427 – 434
Language
English
Abstract
Berry quality is affected by vines water status, but little is known about the effect of the timing and degree of water deficit on the aroma profile.
An experiment was carried out on fully-productive, 7-year-old potted grapevines (Vitis vinifera L. ‘Sangiovese’) to determine the effect of five irrigation regimes on berry aroma concentrations.
Fully-irrigated vines (FI) from fruit set (FS) through harvest were compared with the following deficit irrigation regimes: a) moderate (about 60% of ETc) water deficit from FS through veraison (RDI 1M); b) severe (about 30% of ETc) water deficit from FS through veraison (RDI 1S); c) moderate water deficit from veraison through harvest (RDI 2M); d) severe water deficit from veraison through harvest (RDI 2S). All the RDI vines were fully irrigated when not subjected to water deficit.
The total glycosylated volatile organic compounds (VOCs) concentrations ranged from 6 to 14 mg g‑1 of berry dry weight.
Berry glycosylated VOCs at harvest were higher in RDI-1S and RDI-1M vines (+97 and +35% than FI vines, respectively), whereas no significant differences were found between the two post-veraison deficit irrigation treatments and FI one.
Monoterpenes were higher in RDI 1S and RDI-1M vines (+86 and +36% than control plants, respectively), enhancing the accumulation of the three key compounds such as geraniol, linalool and
-terpineol, whereas water stress imposed after veraison negatively affected monoterpenes concentrations (-17% average between RDI-2 treatments). Similarly, C13-norisoprenoids, vanillins, phenols and benzene derivatives were enhanced in both pre-veraison water deficit treatments with higher values in RDI-1S vines than in RDI 1M ones, whereas post-veraison deficit had negligible or negative effects on their concentration.
Our results show the greater impact of the pre-veraison water stress on the final berry aroma profile than that applied after veraison, as well as that of a severe deficit with respect to a moderate one.
An experiment was carried out on fully-productive, 7-year-old potted grapevines (Vitis vinifera L. ‘Sangiovese’) to determine the effect of five irrigation regimes on berry aroma concentrations.
Fully-irrigated vines (FI) from fruit set (FS) through harvest were compared with the following deficit irrigation regimes: a) moderate (about 60% of ETc) water deficit from FS through veraison (RDI 1M); b) severe (about 30% of ETc) water deficit from FS through veraison (RDI 1S); c) moderate water deficit from veraison through harvest (RDI 2M); d) severe water deficit from veraison through harvest (RDI 2S). All the RDI vines were fully irrigated when not subjected to water deficit.
The total glycosylated volatile organic compounds (VOCs) concentrations ranged from 6 to 14 mg g‑1 of berry dry weight.
Berry glycosylated VOCs at harvest were higher in RDI-1S and RDI-1M vines (+97 and +35% than FI vines, respectively), whereas no significant differences were found between the two post-veraison deficit irrigation treatments and FI one.
Monoterpenes were higher in RDI 1S and RDI-1M vines (+86 and +36% than control plants, respectively), enhancing the accumulation of the three key compounds such as geraniol, linalool and
-terpineol, whereas water stress imposed after veraison negatively affected monoterpenes concentrations (-17% average between RDI-2 treatments). Similarly, C13-norisoprenoids, vanillins, phenols and benzene derivatives were enhanced in both pre-veraison water deficit treatments with higher values in RDI-1S vines than in RDI 1M ones, whereas post-veraison deficit had negligible or negative effects on their concentration.Our results show the greater impact of the pre-veraison water stress on the final berry aroma profile than that applied after veraison, as well as that of a severe deficit with respect to a moderate one.
Authors
G. Palai, G. Caruso, R. Gucci, C. DOnofrio
Keywords
deficit irrigation, terpenes, water stress integral, VOCs
Online Articles (64)