Effects of ambient solar UV radiation on grapevine leaf physiology and berry phenolic composition along one entire season under Mediterranean field conditions

Del-Castillo-Alonso, María-Ángeles; Diago, María P.; Tomás-Las-Heras, Rafael; Monforte, Laura; Soriano, Gonzalo; Martínez‐Abaigar, Javier; Núñez‐Olivera, Encarnación

doi:10.1016/j.plaphy.2016.10.018

Cited by 31 publications

(50 citation statements)

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“…The treatments were established using colourless and transparent polymetacrylate filters (PMMA XT Vitroflex 295 and XT Vitroflex 395 Solarium Incoloro; Polimertecnic, Girona, Spain), which allowed for and blocked, respectively, the transmission of ambient solar UV radiation. The spectral characteristics of these filters were reported previously and compared to ambient conditions . Filters (1.30 × 0.75 m) were placed at 45° from the vertical axis of the plant, on both sides of the canopy, covering the fruiting zone and the first 0.7 m of the canopy of each grapevine.…”

Section: Methodsmentioning

confidence: 99%

“…Although the effects of UV on leaf physiology have been studied, the research performed on berries is more meaningful for agricultural applications. Studies of this type have assessed the effects of both ambient solar and artificially enhanced UV levels using specific cut‐off filters or lamps providing supplemental UV, respectively. In addition, the effects of UV natural gradients have been evaluated .…”

Section: Introductionmentioning

confidence: 99%

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Phenolic characteristics acquired by berry skins of Vitis vinifera cv. Tempranillo in response to close‐to‐ambient solar ultraviolet radiation are mostly reflected in the resulting wines

et al. 2019

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BACKGROUND: It is widely recognized that ambient levels of solar ultraviolet (UV) radiation strongly influence the phenolic composition of grape skins. However, it is unknown to what extent this influence is reflected in the resulting wines. RESULTS: Tempranillo grapevines were exposed or non-exposed to close-to-ambient solar UV levels using appropriate filters, and the phenolic profiles and antioxidant capacity of both grape skins and the resulting wines were analyzed. In total, 47 phenolic compounds were identified in skins and wines, including flavonols, anthocyanins, flavanols, stilbenes, and hydroxycinnamic and hydroxybenzoic acids. In UV-exposed grape skins, flavonols and anthocyanins increased, whereas flavanols and hydroxybenzoic acids showed no significant change. These characteristics were conserved in the resulting wines. However, for stilbenes, hydroxycinnamic acids and antioxidant capacity, the effect of UV on grape skins was not conserved in wines, probably as a result of changes during winemaking. In addition, color intensity, total phenols and total polyphenol index of wines elaborated from UV-exposed grapes increased (although non-significantly) compared to those made from non-UV-exposed grapes. CONCLUSION:The phenolic composition of grape skins exposed to close-to-ambient solar UV could predict, to some extent, the phenolic composition of the resulting wines, particularly regarding higher contents of flavonols and anthocyanins. Thus, manipulating the UV radiation received by grape skins could improve wine quality by positively influencing color stability and healthy properties. To our knowledge, this is the first study in which the effects of solar UV radiation on phenolic composition have been assessed from grape skins to wine. Enological parameters of winesNo enological parameter showed significant differences between FUV+ and FUV-samples (Table 2). However, there was a trend for higher values of color intensity, TPI and total phenols in FUV+ than FUV-samples. Responses of other enological parameters of winesAlthough close-to-ambient levels of solar UV radiation greatly influenced the phenolic composition of grape skins and the resulting wines, they did not affect significantly other enological parameters of these wines, such as alcohol content, pH, total acidity, malic acid, color intensity, TPI and total phenols. However, there was a trend for higher values of the three last variables in FUV+ than FUV-samples, in line with the significant results found in wine that J Sci Food Agric 2020; 100: 401-409

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phenolic characteristics acquired by berry skins of Vitis vinifera cv. Tempranillo in response to close‐to‐ambient solar ultraviolet radiation are mostly reflected in the resulting wines

et al. 2019

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“…These authors did not observe a significant reduction in maximum PSII efficiency, despite the reduction in gas exchange rates in the leaves. In fact, small reductions in photosynthesis may be counterbalanced by the accumulation of phenolic compounds in the leaves (Del-Castillo-Alonso et al, 2016). The multi-factor analysis applied to the whole data separated variations in leaf gas exchange from direct primary photochemistry; however, under the high direct solar radiation conditions of the control plants, gas exchange performance in the leaves was affected the most by sunlight and was linked to the performance of the light-dependent photosynthesis step.…”

Section: Treatment-dependent Responsesmentioning

confidence: 99%

“…Many varieties have shown photosynthetic and metabolic tolerance and high acclimation capacity to high insolation and temperature conditions (Young et al, 2016;Castagna et al, 2017). However, decreases in the intensity of leaf gas exchange and distinct behaviours among varieties have been reported in response to UV light, heat and drought conditions (Schultz, 2003;Alsina et al, 2007;Berli et al, 2010), and reductions in net assimilation and water losses during long stress periods are frequently combined with alterations in pigment balance, namely in UV-absorbing pigments (Kolb et al, 2001;Martínez-Lüscher et al, 2013;Del-Castillo-Alonso et al, 2016). By decreasing light absorption, this adjustment mechanism allows plants to protect the photosynthetic apparatus against reactive oxygen species, and thus to tolerate high irradiation levels, avoiding photoinhibition and photooxidation (Liakopoulos et al, 2007, Martínez-Lüscher et al, 2013.…”

Section: Introductionmentioning

confidence: 99%

UV Light Acclimation Capacity of Leaf Photosynthetic and Photochemical Behaviour in Near-isohydric and Anisohydric Grapevines in Hot and Dry Environments

Oliveira

Rais

Dettori

et al. 2019

SAJEV

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The photosynthetic and photochemical adaptation of grapevine leaves to high UV radiation, under hot and dry summer conditions, was investigated in near-isohydric Cannonau (syn. Grenache) and nearanisohydric Bovale grande (syn. Carignan). From pea-size stage until harvest, vines with mild to moderate water deficit were subjected to UV-blocking treatment (-UV) and compared to a control exposed to sunlight (C). Canopy light and thermal microclimate, growth and density, maximum leaf gas exchange, primary photochemistry (PSII) and phenols were monitored. Average increments in canopy temperature under -UV tunnels during day-time and night-time were 3.3°C and 0.8°C in Bovale grande and 2.6°C and 1.1°C in Cannonau. Cultivars reached similar leaf area, intrinsic water-use efficiency and stem water potential under C and -UV. Cannonau showed lower stomatal conductance, maximum net assimilation and transpiration rates, but also faster recovery of PSII under heat and moderate water stress. UV radiation induced a stronger and longer impact on leaf assimilation, but the duration of elevated temperatures under −UV induced higher photoinhibition and lower photochemical efficiency. A similar degree of correlation between leaf temperature and gas exchange was found among cultivars and treatments. In Cannonau, leaf anthocyanin decreased due to heat-induced long-lasting PSII photoinactivation under C. Conversely, Bovale grande showed higher phenolic content stability, thus higher photoprotection and recovery of PSII functional units. Agronomical practices affecting leaf phenolic accumulation influence canopy acclimation to heat and high sunlight. Vineyard management must avoid excessive canopy sun exposure and duration of elevated temperatures to favour high assimilation, while reducing photoinactivation and heat damage.

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“…Although different species may have different responses [20], there is a general notion that solar ultraviolet radiation (UV total radiation 280-400 nm) has relevant biological effects on agroecosystems and induce the accumulation of phenolic compounds in the plant [14,19,20]. However, global UV fraction (i.e., ratio of the UV to global solar radiation) is highly dependent on variations in the concentration of clouds, water vapor and aerosols in the atmosphere and may vary from 2.0% to 9.5% [21,22]. Such environmental factors impact the quality of greenhouse vegetables.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant Seasonal Changes in Soilless Greenhouse Sweet Peppers

Neocleous

Νικολάου

2019

Agronomy

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This study was commissioned to study the effect of the growing season on the antioxidant components of greenhouse sweet pepper crops, which is of scientific interest because of their possible beneficial health effects. The total antioxidant activity (estimated by ferric reducing antioxidant power-FRAP assay) major antioxidants (ascorbic acid, phenolics and carotenoids) and taste fruit quality characteristics (soluble solids, titratable acidity, dry matter and sugars) were recorded in soilless-grown sweet pepper cultivars of red, orange, yellow and green color at four harvesting season months, i.e., February (winter), May (spring), July (summer) and October (autumn). The results showed seasonal variations in antioxidant components and activity of pepper fruits. In most cases measured parameters showed higher values in spring (May) and summer (July) compared with winter (February) and autumn (October) growing seasons. This study indicates that during late autumn and winter, lower levels of solar irradiance, ultraviolet radiation and temperature in Mediterranean greenhouses can be insufficient to stimulate phytochemicals production in peppers; thus, plant–light interception must be more actively managed.

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Effects of ambient solar UV radiation on grapevine leaf physiology and berry phenolic composition along one entire season under Mediterranean field conditions

Cited by 31 publications

References 47 publications

Phenolic characteristics acquired by berry skins of Vitis vinifera cv. Tempranillo in response to close‐to‐ambient solar ultraviolet radiation are mostly reflected in the resulting wines

Phenolic characteristics acquired by berry skins of Vitis vinifera cv. Tempranillo in response to close‐to‐ambient solar ultraviolet radiation are mostly reflected in the resulting wines

UV Light Acclimation Capacity of Leaf Photosynthetic and Photochemical Behaviour in Near-isohydric and Anisohydric Grapevines in Hot and Dry Environments

Antioxidant Seasonal Changes in Soilless Greenhouse Sweet Peppers

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