4.7 Editorial Material

Increasing our knowledge on grapevines physiology to increase yield, quality and sustainably

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Do the ends justify the means? Impact of drought progression rate on stress response and recovery in Vitis vinifera

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Summary: Plants exposed to fast-developing drought close stomata quickly and accumulate high levels of ABA in xylem sap, while plants experiencing slow-developing drought close stomata gradually, accumulate lower ABA levels, and prime the stem for recovery through changes in pH and sugar content. Despite similar trends in stomatal conductance recovery over time, the sensitivity to xylem ABA differed between the two drought rates, leading to different strategies in balancing hydraulic integrity and photosynthetic activity.

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An apoplastic fluid extraction method for the characterization of grapevine leaves proteome and metabolome from a single sample

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Summary: The analysis of complex biological systems challenges researchers, especially in understanding interactions within plant cellular compartments such as the apoplast. Despite knowledge on the involvement of apoplast in various processes, its dynamics remain poorly understood due to lack of efficient extraction methods.

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Dual function of VvWRKY18 transcription factor in the β-aminobutyric acid-activated priming defense in grapes

Kaituo Wang et al.

Summary: Activation of VvWRKY18 by BABA triggers the expression of defense-related genes and enhances stilbene production in grapes, leading to increased resistance against Botrytis cinerea invasion. The interaction between VvWRKY18 and VvNPR1 plays a crucial role in initiating systemic acquired resistance defense.

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Non-structural carbohydrates and sugar export in grapevine leaves exposed to different light regimes

Silvina Dayer et al.

Summary: This study examined the relationship between photosynthesis, carbohydrate metabolism, and gene expression in grapevine leaves under different radiation conditions. The results showed that leaves exposed to more sunlight had higher photosynthetic and export rates, while shaded leaves accumulated less starch and soluble sugars. The findings suggest that sugars in shaded leaves may play a role as signaling molecules and affect sink strength and phloem unloading.

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Houssein Monder et al.

Summary: Grapes, economically important for their high fruit value and significance in winemaking, are currently facing decreased quality and production due to abiotic constraints from climate change. Potassium plays a crucial role in grapevine growth, composition, and wine quality, impacting berry loading during ripening and defenses against stress. Understanding potassium's functions can aid in selecting crops better suited for adverse environmental conditions.

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Intracultivar genetic diversity in grapevine: Water use efficiency variability within cv. Grenache

Ignacio Buesa et al.

Summary: The study showed significant differences in water use efficiency among 13 Grenache grape genotypes at different levels, with high consistency among levels despite large interannual variability. Using genotype-specific regressions allows for significant differences in water use efficiency responses to be identified, and the relationship between net photosynthesis, stomatal conductance, and carbon isotope discrimination were confirmed as reliable physiological indicators for selecting grapevine genotypes under future environmental conditions.

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Grapevines under drought do not express esca leaf symptoms

Giovanni Bortolami et al.

Summary: In grapevine, drought completely inhibited the leaf symptom expression of vascular disease (esca). By quantifying whole-plant water relations and carbon balance, the study revealed distinct physiological responses to these two stresses, indicating different gas exchange and nonstructural carbohydrate dynamics.

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Trichoderma spp. volatile organic compounds protect grapevine plants by activating defense-related processes against downy mildew

Valentina Lazazzara et al.

Summary: The study investigated the effects of volatile organic compounds (VOCs) produced by Trichoderma strains on grapevine downy mildew. Results showed that certain compounds reduced disease severity and enhanced grapevine defense mechanisms, indicating their potential application for disease control.

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Container volume affects drought experiments in grapevines: Insights on xylem anatomy and time of dehydration

Jose Carlos Herrera et al.

Summary: Plant stress experiments are commonly conducted in containers to control environmental conditions, but the container volume can affect plant growth and development. In drought experiments with grapevines, plants in different container sizes showed differences in physiological responses, highlighting the importance of considering container volume in experimental design for unbiased results.

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Secondary metabolites and related genes in Vitis vinifera L. cv. Tempranillo grapes as influenced by ultraviolet radiation and berry development

Maria-Angeles Del-Castillo-Alonso et al.

Summary: The study found that ambient UV-B radiation had stronger effects than ambient UV-A, leading to increased flavonol contents, gene expression related to flavonol synthesis, and grape growth. Pea-size and harvest were the most UV-sensitive phenological stages, with the skin being the most responsive grape component. UV radiation plays a crucial role in inducing specific grape phenolic and volatile compounds, with implications for grape and wine quality as well as potential use as nutraceuticals.

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Esca-affected grapevine leaf metabolome is clone- and vintage-dependent

Florian Moret et al.

Summary: Esca is a complex grapevine trunk disease caused by wood-rotting fungi, with inconsistent foliar symptoms influenced by environmental, physiological, and genetic factors. Clonal and year-dependent metabolic responses to the disease were observed, showing different metabolite fingerprints and symptom expression between Chardonnay and Trousseau clones. Possible relationship with rainfall and higher susceptibility of certain clones were also identified.

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Understanding and managing nitrogen nutrition in grapevine: a review

Thibaut Verdenal et al.

Summary: Grapevine nitrogen management involves balancing controlling vigour, optimizing grape composition, regulating production costs, and limiting pollution. The grapevine nitrogen metabolism from root nitrogen uptake to vine development and ripening has impacts on the formation of grape aroma compounds.

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Plant water status and genotype affect fruit respiration in grapevines

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Carbon isotope composition of sugars in grapevine, an integrated indicator of vineyard water status

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