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Fruit ripening in Vitis vinifera L.: An overview of the relationships among hormones, transcripts, and metabolites
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Effetto dello stress idrico sulla biosintesi dei composti fenolici nella bacca di Vitis vinifera L. cv 'Merlot'
No full textPreveraison water deficit accelerates berry color change in merlot grapevines
Full text linkIn red varieties, berry color change from green to red is one of the first events associated with ripening and is often used as an indicator of veraison by viticulturists. Water deficit can accelerate ripening and increase pigment accumulation in the berry skin. The impact of water deficit on the timing and progression of berry color change in the vineyard has been largely overlooked. Here we present three years of observations (2011 to 2013) on the progression of color change in Merlot vines subjected to water deficit (WD) or irrigation (C) regimes. Water deficit did not affect the date at which berries started changing color in 2011 and 2012, but pigmentation began three days earlier in WD than in C vines in 2013. Water deficit accelerated pigmentation in all three years and WD berries completed color change five days earlier than C berries on average. © 2016 by the American Society for Enology and Viticulture
Water deficit enhances anthocyanin accumulation in berry skin through up-regulation of genes of the biosynthetic pathway
No full textImpact of water deficit on the synthesis of phenolic compounds during berry ripening of Vitis vinifera cv. Merlot
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EFFETTO DELLA CIMATURA TARDIVA E DEL DEFICIT IDRICO SULLA QUALITÀ DELL’UVA MERLOT
No full textThe effect of leaf area reduction in Merlot grapevines was tested in well irrigated vines and in vines under water deficit. The effect was monitored over two consecutive seasons. In full irrigation regime (I) vines were irrigated weekly to maintain midday stem water potential (Ψstem) between −0.3 and −0.6 MPa. In water deficit (D) condition, irrigation was managed in order to maintain Ψstem between −1.0 and −1.4 MPa from fruit set to harvest. Within each irrigation regime two different levels of canopy height were imposed: high canopy (110 cm) and short canopy (60 cm). Canopy reduction under full irrigation and water deficit conditions produced different results. Brix degrees were reduced only under well irrigated conditions, while under water deficit no effects of canopy reduction were observed. The reduction of leaf area did not influence the anthocyanin and tannin concentrations
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