Figure 4.

The concentrations of NH₄⁺ (a), NO₃^- (b), succinic acid (c), and various amino acids (d–s) in roots of kiwifruit plants treated with -Fe, +Bic or -Fe+Bic in solution culture for 35 days. Values are means of five replicates ± SE. Different letters indicate significant differences among the treatments at p < 0.05. FW, fresh weight; NS, not significant. Ala, alanine; Arg, arginine; Asp, aspartic acid; GABA, γ-aminobutyric acid; Glu, glutamic acid; Gly, glycine; His, histidine; Ile, isoleucine; Leu, leucine; Lys, lysine; Phe, phenylalanine; Ser, serine; Thr, threonine; Tyr, tyrosine; Val, valine.