@Article{phyton.2026.088464,
AUTHOR = {Gastón Gutiérrez-Gamboa, Nicolás Verdugo-Vásquez, Marisol Reyes Muñoz, Marcos Carrasco-Benavides, Sebastián Romero-Bravo, Manuel Chacón-Fuentes, Miguel Araya-Alman},
TITLE = {Canopy Microclimate Affect Vine Physiology, Bunch Sunburn, and Berry Amino Acid Content in East–West Oriented Chardonnay Vines},
JOURNAL = {Phyton-International Journal of Experimental Botany},
VOLUME = {},
YEAR = {},
NUMBER = {},
PAGES = {{pages}},
URL = {http://www.techscience.com/phyton/online/detail/28143},
ISSN = {1851-5657},
ABSTRACT = {(1) Background: Increasing heat and radiation exposure in Mediterranean vineyards are intensifying the risk of berry sunburn and altering grape composition, particularly in white cultivars such as Chardonnay. Canopy management and shading nets are potential adaptation strategies, but their effects on microclimate, vine physiology, and nitrogen-related berry composition remain insufficiently understood. (2) Methods: This study evaluated the effects of photoselective and conventional shade nets, leaf removal, and an untreated control on Chardonnay grapevines grown in east–west-oriented rows during one growing season. (3) Results: The incident photosynthetically active radiation (PARi) was strongly increased by leaf removal, being 124.0% higher than under the conventional Raschel net, 112.6% higher than under the photoselective black-white net, and 80.9% higher than the control without intervention. The photoselective black-white net eliminated afternoon temperature events above 35°C, although it showed the highest sunburn severity. Leaf removal showed the highest stem water potential values, increasing proline concentration in grapes. The conventional Raschel net reduced berry arginine concentration compared with all other treatments and increased serine and histidine concentrations relative to the control and black–white photoselective net, although these amino acids did not differ from leaf removal. (4) Conclusions: Shading nets and leaf removal differentially modified light exposure, the frequency of extreme heat events, vine water status, and amino acid metabolism in Chardonnay vines trained in east–west-oriented rows. These findings highlighted the need to adjust canopy and shading strategies according to row orientation, as practices that mitigate heat exposure may also produce contrasting effects on berry sunburn and composition.},
DOI = {10.32604/phyton.2026.088464}
}