Abstract
In this study, the effects of the microclimatic changes around the grapes on quality parameters in Shiraz berries were investigated. Variations in microclimate condition of grapes were created by the four different shading treatments: fully exposed (Exp), natural shading (Nsh), 40% of shading (V40), and 60% of shading (V60). During the experiment, illuminance (lux), ultraviolet light (W/cm 2 ), temperature (°C), and relative humidity (%) of each microclimate was continuously recorded by data loggers placed in adjacent grapes perceiving the same microclimate conditions. Shading treatments were set from the initial stage of ripening, and maintained to harvest. Subsequently, influence of the shading treatments on berry quality characteristics was measured by determining physicochemical composition, phenolic accumulation, and antioxidant potential of berries at harvest. A quantitative increase in berry weight (g), pH, and titratable acidity (%) of its juice were observed in shaded grapes, but they decreased in Exp grapes, particularly for total soluble solids (24.3 ± 0.5 °Brix). Similarly, total phenolic (1795.5 ± 40.1 mg GAE/kg fwt), and flavonoid (310.9 ± 8.7 mg CE/ kg fwt) contents of berries exposed to solar radiation were higher than grapes grown under shading (V40, V60) conditions. The response of total antioxidant potential to shading treatments was variable and depended on shading level. Fully exposed grapes may not be desirable for some reasons including low anthocyanin accumulation, fast ripening process, berry desiccation, and crop loss due to sunburn. Even if exposed berries reached the highest phytochemical content and antioxidant potential, they are not enough for grape berry quality standards normally accepted. Under the study conditions, 40% of shading may meet the expected grape berry quality. Microclimatic changes in fruit zone of grapevines significantly affected berry quality characteristics, secondary metabolite content and antioxidant potential of grape tissues. Therefore, modifications in microclimate conditions of fruit zone may receive considerable research interest in the future studies under harsh climate conditions.
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Claims 7
Claim · model-written summary
Shaded grapes had increased berry weight, juice pH and titratable acidity.
Verbatim
e0“A quantitative increase in berry weight (g), pH, and titratable acidity (%) of its juice were observed in shaded grapes, but they decreased in Exp grapes”
Claim · model-written summary
Exposed grapes had total soluble solids of 24.3 ± 0.5 °Brix.
Verbatim
e0“Exp grapes, particularly for total soluble solids (24.3 ± 0.5 °Brix)”
Claim · model-written summary
Exposed berries had higher total phenolic content than shaded berries.
Verbatim
e0“total phenolic (1795.5 ± 40.1 mg GAE/kg fwt), and flavonoid (310.9 ± 8.7 mg CE/ kg fwt) contents of berries exposed to solar radiation were higher than grapes grown under shading (V40, V60) conditions”
Claim · model-written summary
Exposed berries had higher flavonoid content than shaded berries.
Verbatim
e0“total phenolic (1795.5 ± 40.1 mg GAE/kg fwt), and flavonoid (310.9 ± 8.7 mg CE/ kg fwt) contents of berries exposed to solar radiation were higher than grapes grown under shading (V40, V60) conditions”
Claim · model-written summary
The antioxidant response varied with shading level.
Not reportedComparator
Verbatim
e0“The response of total antioxidant potential to shading treatments was variable and depended on shading level.”
t0“grape berries”
Claim · model-written summary
Fully exposed grapes showed low anthocyanin accumulation, rapid ripening, desiccation and sunburn crop loss.
Verbatim
e0“Fully exposed grapes may not be desirable for some reasons including low anthocyanin accumulation, fast ripening process, berry desiccation, and crop loss due to sunburn.”
Claim · model-written summary
Under study conditions, 40% shading may meet grape berry quality expectations.
Verbatim
e0“Under the study conditions, 40% of shading may meet the expected grape berry quality.”
t0“grape berries”
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See all 18 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.