Table 2.

Effect of iron availability and nitrogen forms treatments on stomatal conductance (g_sw), transpiration rate (E), and efficiency of photosynthesis (YII) of different grapevine rootstocks

Genotype	Treatment	Stomatal Conductance	Transpiration Rate	Efficiency of photosynthesis (Y(II)) young leaves
		(mol m− 2 s− 1)	(mmol m− 2 s− 1)
3309 C	N1A0 / +Fe	0.24 ± 0.04 a	4.11 ± 1.53 a	0.68 ± 0.03 a
	N1A0 / -Fe	0.37 ± 0.07 a	4.31 ± 0.61 a	0.21 ± 0.04 c
	N1A1 / +Fe	0.36 ± 0.13 a	5.39 ± 1.41 a	0.66 ± 0.03 a
	N1A1 / -Fe	0.42 ± 0.18 a	6.09 ± 1.72 a	0.53 ± 0.06 a
	Welch-ANOVA	F(3, 10.793) = 1.477, p = 0.276	F(3, 10.070) = 3.214, p = 0.070	* F(3, 5.334) = 96.979, p < 0.001
Fercal	N1A0 / +Fe	0.23 ± 0.04 ab	3.03 ± 1.35 ab	0.67 ± 0.01 ab
	N1A0 / -Fe	0.14 ± 0.06 b	2.78 ± 0.91 b	0.31 ± 0.09 b
	N1A1 / +Fe	0.35 ± 0.14 a	4.32 ± 1.36 a	0.65 ± 0.02 a
	N1A1 / -Fe	0.32 ± 0.05 a	4.12 ± 1.09 ab	0.54 ± 0.07 ab
	Welch-ANOVA	* F(3, 16.257) = 17.830, p < 0.001	F(3, 17.387) = 4.121, p = 0.022	* F(3, 3.587) = 13.490, p = 0.020

Presented values are mean values with standard error. Significant differences between treatments for each rootstock are indicated with different letters. (α < 0.05, Welch-ANOVA and Tukey or Games-Howell post hoc test, N = 5 per treatment and rootstock)

* significant Levene Test