Isohydrodynamic behavior in deficit-irrigated Cabernet Sauvignon and Malbec and its relationship between yield and berry composition

摘要: Cabernet Sauvignon and Malbec grapevines were irrigated at 70 or 23 % of estimated crop evapotranspiration throughout berry development over four growing seasons. Stomatal behavior was characterized by relating predawn leaf water potential mid-morning stomatal conductance to potential. Seasonal average weekly midday lower in than despite similar irrigation amounts. Both cultivars exhibited anisohydric with decreasing linearly declining (r2 = 0.51) 0.42). However, both utilized hydrodynamic mechanisms maintain a soil-to-leaf gradient −0.62 (±0.03) MPa under standard −0.75 (±0.04) reduced irrigation. Berry fresh weight titratable acidity decreased, the concentration total anthocyanins increased response decreases The slope regression equations for seasonal mean used estimate cultivar-specific levels stress associated changes composition fruit maturity.