Timing of defoliation affects anthocyanin and sugar decoupling in Grenache variety growing in warm seasons
Warming trends over the winegrowing regions lead to an advance of grapevine phenology, decreased yield and increased sugar content with a lower polyphenol content. We hypothesized that different leaf removal timings may counteract these effects. A two-year experiment was conducted in La Rioja (Spain) with Vitis vinifera L. cv. Grenache trained in an open-vase system. Trial consisted in a complete block design with two leaf removal treatments differing in the moment of manipulation: i) severe leaf removal treatment conducted after fruit set (ELR); and ii) severe leaf removal at veraison (LLR) compared to an untreated control (Control). Both leaf removal treatments tended to decrease sugar content with no effect on yield, these effects being highly affected by the year. Defoliation accounted for a decreased flavanol and stilbene contents in berries at harvest. An ELR increased anthocyanin and phenolic acid contents at harvest, while warming during 2022 accounted for decreased contents of all the monitored groups of flavonols. ELR was only effective for delaying ripening by means of impairing the sugar:anthocyanin decoupling during the 2021 growing season which was related to lower % of kaempferol. Altogether, results suggested that defoliation should still be applied under currently warming trends in some viticulture regions.
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Elsevier
2024-01
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| Subjects: | Analytical techniques, Canopy management, Climate change, Cluster exposure, Grapevine Kaempferol, Leaf removal, Organoleptic properties, Phenolic compounds, Wine quality, |
| Online Access: | http://hdl.handle.net/10261/362464 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100007680 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100011033 https://api.elsevier.com/content/abstract/scopus_id/85173464927 |
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