Figure 4.

The influence of Si supply on amino acids concentrations of maize plants subjected to Mg deficiency. (A) GABA concentration in roots, (B) Gly concentration in roots, (C) Ser concentration in roots, (D) GABA concentration in shoots, (E) Gly concentration in shoots and (F) Ser concentration in shoots of maize. Plants were grown in hydroponic culture under low Mg (0.02 mM) or normal Mg (0.5 mM) supply and two concentrations of Si (1.5 and 3 mM). Si provided in the second week of plant growth in the hydroponic culture when Mg deficiency was applied. 21-days old plants were harvested 14 days after imposition of Mg deficiency. The white and black bars represent Mg-sufficient and Mg-deficient plants, respectively. Bars indicate means ± SE. Different letters denote significant differences according to LSD test (p < 0.05; n = 4).