ISHS Acta Horticulturae 1370: XXXI International Horticultural Congress (IHC2022): International Symposium on the Vitivinicultural Sector: Which Tools to Face Current Challenges?
Different patterns of temperature impact phenolic derivatives in ripening Vitis sp. berries |
| Authors: | K. Pedneault, J. Pico Carbajo, P. Nicolle, M. Pathak, N. Wilson, F. Campos-Arguedas, G. Sarailhé, M. Dorais, N.J.B. Brereton, S. Castellarin, F.E. Pitre |
| Keywords: | secondary metabolites, climate change, phenylpropanoids, volatile compounds, berry ripening, abiotic stress, interspecific hybrid grape |
| DOI: | 10.17660/ActaHortic.2023.1370.9 |
| Abstract:
Global warming significantly increases temperatures in northern countries such as Canada. Because specific metabolic activities occur at different time during berry development and ripening, irregular temperature patterns may affect fruit biochemistry. We hypothesized that variations in GDD accumulation patterns may affect grapevine metabolism and modulate the accumulation of secondary metabolites such as phenolic compounds during berry development ripening, therefore impacting their composition at harvest. To test this hypothesis, we implemented a field experiment involving portable mini-greenhouses to locally increase the temperature of the canopy of ‘L’Acadie blanc’ grapevine grown in commercial vineyard in Nova Scotia, Canada during pre-veraison (Pre), post-veraison (Post), during the whole season (All) and a control. Berries were sampled at different phenological stages (EL-32, EL-36, EL-37, EL-38) and phenolic compounds profiles (24 compounds) were analyzed by LC-MS/MS. Temperature treatments significantly affected phenolic compound profiles of berries but impacts differed from one phenological stage to another. At stage EL-32, the treatments Post and Control had significantly higher level of flavonoids (24.8 mg kg 1 FW, in average) than the treatments All and Pre (2.73 mg kg-1, FW, in average). Flavonoids were also in significantly higher concentrations in berries from the Post and Control treatments at stage EL-38 (18.4 and 10.3 mg kg-1 FW, respectively, compared to 3.04 mg kg-1 in All and Pre treatments, in average). Besides temperature, greenhouse treatments also altered UV radiation exposure. Yet, results showed significant metabolic shifts in phenolic compound biosynthesis from one treatment to another. They also highlighted that environmental conditions (e.g., temperature and UV exposure) during early fruit development are critical for berry composition at harvest. | |
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