Figure 6.

Regulation of Fe homeostasis-related genes in rice roots as affected by Fe concentration and Fe form grown without Si and with Si (3 and 30 mg Si L⁻¹, respectively) in nutrient solution. The 2^−∆∆Ct values against the control are shown. (A) Gene expression in roots of rice plants grown with Fe^EDDHA in various concentrations (control = −Si, 2 mg L⁻¹ Fe). (B) Gene expression in roots of rice plants grown with 2 mg Fe in the form of Fe^EDDHA, Fe^EDTA and Fe^(II)SO₄ (control = −Si, Fe^EDDHA). A star indicates significant differences against the control. Green color indicates downregulation and a red color upregulation compared to the WT grown without Si at optimal Fe conditions (2 mg L⁻¹ Fe^EDDHA).