Fig. 3From: The activation of iron deficiency responses of grapevine rootstocks is dependent to the availability of the nitrogen formsDirect and indirect evaluation of leaves chlorophyll content and chlorophyll fluorescence. (A) Iron deficiency chlorosis visual symptoms with both rootstocks and all treatments (N1A0/+Fe; N1A0/-Fe; N1A1/+Fe; N1A1/-Fe), (B) total chlorophyll concentration in young leaves, (C) non-destructive assessment of chlorophyll content by measuring the SPAD index, and (D) maximum photochemical rate of photosynthesis (FvFm). Values shown are means ± standard error and 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)Back to article page