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Table 2.

Parameters measured on Italia (It) and Autumn royal (AR) plants subjected to different irrigation conditions: over-irrigation (OI), full irrigation (FI), water deficit (WD). Measurements for leaf gas exchange and water use efficiency (columns B-F) were collected 2–3 days after differential irrigation, corresponding to the first significant variation of Ψ leaf; Data are means ± SD. Statistically significant differences between varieties at the same condition were assessed by t test (**p < 0.01, *p < 0.05). Quality parameters are reported in columns G-N: bSST: Total Soluble Solids; cTTA: Total Titratable Acidity. Data are means ± SD. Statistically significant differences comparing OI or WD to FI condition were assessed by t test (**p < 0.01).

Samplea Photosynthesis Stomatic Transpiration Intrinsic Instantaneous N. of Bunch weight (g) Vine Berry TSS (Brix)b pH TTA (g/L)c TSS/TTA
rate conductance rate water use water use bunches production fresh
A(μmol m−2s−1) gs(mol m−2s−1) E(mmol m−2s−1) efficiency efficiency weight
A/gs(μmol A/E(μmol (Kg)
mol−1) mmol−1)
It OI 11.06 ± 2.28 0.21 ± 0.04 5.57 ± 0.89 54.28 ± 15.94 2.03 ± 0.50 37.10 ± 6.89 826.25 ± 130.39 30.65 ± 0.90 10.01 ± 1.61 16.00 ± 0.28 3.47 ± 0.04 5.96 ± 0.21 26.86 ± 1.43
It FI 9.54 ± 2.65 0.19 ± 0.07 5.47 ± 1.62 56.92 ± 23.14 1.89 ± 0.71 33.40 ± 5.76 857.83 ± 127.68 28.65 ± 0.74 10.37 ± 2.02 17.00 ± 0.00 3.49 ± 0.01 5.53 ± 0.29 30.78 ± 1.62
It WD 9.47 ± 2.85 0.15 ± 0.05 4.53 ± 1.45 67.16 ± 19.44 2.22 ± 0.64 27.30 ± 4.99** 811.75 ± 168.12** 22.16 ± 0.84 9.99 ± 2.49 16.10 ± 0.14 3.49 ± 0.06 4.35 ± 0.11 37.02 ± 0.58
AR FI 8.10 ± 1.38 0.12 ± 0.02 3.50 ± 0.47** 69.22 ± 8.56 2.33 ± 0.41 12.60 ± 8.91 2555.20 ± 181.01 32.20 ± 1.61 8.63 ± 0.27 15.20 ± 0.40 3.35 ± 0.22 3.93 ± 0.04 38.65 ± 1.41
AR WD 7.96 ± 4.57 0.09 ± 0.05 3.16 ± 1.68* 89.7 ± 23.28 2.58 ± 0.70 13.40 ± 6.80 1485.74 ± 648.80** 19.91 ± 4.41** 5.01 ± 0.20 14.03 ± 0.85 2.92 ± 0.28 3.72 ± 0.06 37.74 ± 1.68

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