Foliar Application of Polyols Stimulates the Synthesis of Anthocyanins and Stilbenes Among Other Modifications of Secondary Metabolome in Grape Berry Exocarps

Condé, Artur; Badim, Hélder; Dinis, Lia-Tânia; Moutinho-Pereira, J.M.; Ferrier, M. Drew; Unlubayir, Marianne; Lanoue, Arnaud; Gerós, Hernâni

doi:10.2139/ssrn.4296746

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“…This effect could be attributed to sugar alcohols facilitating nutrient and reserve transport to plant tissues, especially fruits like grapes, as Conde et al [72] characterized a sorbitol transporter (VvPLT1) in grape mesocarp cells responsible for sugar alcohol absorption, which could be crucial under stress conditions where sugar alcohols are rapidly oxidized to reducing sugars by sorbitol dehydrogenases. Pre-harvest treatments with polyols (2 mM sorbitol and 2 mM mannitol) on 'Touriga Nacional' grapes doubled sorbitol dehydrogenase activity in mature grapes [66].…”

Section: Resultsmentioning

confidence: 95%

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Role of Pre-harvest Sorbitol-Calcium Treatments in Controlling Berry Drop in Bagged Table Grapes of the "Doña María" Variety

Guirao,

Valverde,

Díaz-Mula

et al. 2024

Preprint

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'Cv 'Doña María' table grape is a high-quality table grape variety included in the Protected Designation of Origin (PDO) of the European Union "The bagged grape of the Vinalopó." The PDO stipulates that grape clusters must be protected with paper bags from inclement weather and insects, which helps enhance the final grape quality. However, 'Doña María' is a variety prone to high shattering in the late stages of ripening on the vine and during postharvest. Inorganic calcium treatments are one of the most commonly used tools to reduce this disorder, but the translocation of this mineral from veraison onward has been questioned. In this study, five applications were performed, from veraison to harvest, using sorbitol-chelated calcium (0.7 % + 1.0 %), Ca(NO3)2 (Ca) at 0.7% and sorbitol at 1%. It was observed that bagged grapes (not wetted with the solutions) only increased the concentration of total and bound calcium when treated with Sorbitol-Ca. This resulted in reduced berry drop during cultivation and postharvest and improved fruit firmness. Additionally, it reduced grape metabolism indicators such as respiration rate, weight loss, malic acid degradation, prevented abscisic acid (ABA) and malondialdehyde (MDA) accumulation, and favored the accumulation of secondary metabolites such as total polyphenols, increased antioxidant activity, and sugar content. The application of sorbitol-chelated calcium is an effective and safe tool that enhances fruit quality and prevents losses due to shattering during postharvest.

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Section: Resultsmentioning

confidence: 95%

“…Sorbitol treatments in maize seedlings conferred greater drought resistance and improved antioxidant systems to mitigate abiotic stress [65]. Conde et al [66] demonstrated that preharvest treatments with 2 mM sorbitol and 2 mM mannitol increased the concentration of anthocyanins, stilbenes, and total phenolics in grape berries.…”

Section: Resultsmentioning

confidence: 99%