Unraveling the Physiological Mechanisms Underlying the Intracultivar Variability of Water Use Efficiency in <i>Vitis vinifera</i> "Grenache".

In all genotypes, the linear regression between both water indicators was highly significant ( p < 0.001), but not very strong (r 2 ranging from 0.61 to 0.80) ( Supplementary Table S2 ).

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Leaf osmotic potential (Ψ π ), similarly to Ψ stem , showed a decreasing trend across the seasons ( Table 1 ).

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The WUE WP was not significantly related to WUE i , although a positive trend between both WUE levels was observed in both seasons ( Figure 4 ). 2.6.

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