Canopy Architecture and Sun Exposure Influence Berry Cluster–Water Relations in the Grapevine Variety Muscat of Alexandria
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Author
Pinto, Clara
Alarcón, Maria Victoria
Flores-Roco, Alicia
Santos, Leonardo
David, Teresa S.
Amancio, Sara
Lopes, Carlos M.
Carvalho, Luisa C.
Publication date
2024-05-29ISSN
2223-7747
Abstract
Climate-change-related increases in the frequency and intensity of heatwaves affect viticulture, leading to losses in yield and grape quality. We assessed whether canopy-architecture manipulation mitigates the effects of summer stress in a Mediterranean vineyard. The Vitis vinifera L variety Muscat of Alexandria plants were monitored during 2019–2020. Two canopy shoot-positioning treatments were applied: vertical shoot positioning (VSP) and modulated shoot positioning (MSP). In MSP, the west-side upper foliage was released to promote partial shoot leaning, shading the clusters. Clusters were sampled at pea size (PS), veraison (VER), and full maturation (FM). Measurements included rachis anatomy and hydraulic conductance (Kh) and aquaporins (AQP) and stress-related genes expression in cluster tissues. The results show significant seasonal and interannual differences in Kh and vascular anatomy. At VER, the Kh of the rachis and rachis+pedicel and the xylem diameter decreased but were unaffected by treatments. The phloem–xylem ratio was either increased (2019) or reduced (2020) in MSP compared to VSP. Most AQPs were down-regulated at FM in pedicels and up-regulated at VER in pulp. A potential maturation shift in MSP was observed and confirmed by the up-regulation of several stress-related genes in all tissues. The study pinpoints the role of canopy architecture in berry–water relations and stress response during ripening.
Document Type
Article
Document version
Published version
Language
English
Subject (CDU)
634 - Fruit growing
Pages
19
Publisher
MDPI
Is part of
Plants
Citation
Olfa Zarrouk, Clara Pinto, Maria Victoria Alarcón, Alicia Flores-Roco, Leonardo Santos, Teresa S David, Sara Amancio, Carlos M Lopes, and Luisa C Carvalho. 2024. “Canopy Architecture and Sun Exposure Influence Berry Cluster–Water Relations in the Grapevine Variety Muscat of Alexandria.” Plants 13 (11). doi:10.3390/plants13111500.
Grant agreement number
FEDER/ / /EU/ /
Program
Fructicultura
This item appears in the following Collection(s)
- ARTICLES CIENTÍFICS [2759]
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/