Figure 5.

(A) Effect of the IO⁻₃ treatment on iodate reduction activity of excised rice roots. After the IO⁻₃ treatment at 0, 0.25, 2.5, 25, 50, 100 μmol L⁻¹, iodate reduction activity (the amount of I⁻ reduced from IO⁻₃ by 1 g (FW) of excised roots per hour) was measured. Data are mean ± standard error (n = 3). Bars with the same letter are not significantly different among each iodine treatments in each cultivar (Tukey's multiple range test, P < 0.05). (B, C) Concentration of total iodine in (B) shoots and (C) roots of “Nipponbare” and “Gohyakumangoku” after the IO⁻₃ treatment. Data are mean ± standard error (n = 3). ^*P < 0.05; ^**P < 0.01, t-test.