Fig. 1

Effect of NaHS on the phenotype (a), dry biomass (b and c), and chlorophyll content (d and e) of iron-deficient Glycine max plants. The 3-w-old G. max seedlings that were treated with the nutrition solution containing 1 μM Fe(III)-EDTA (−Fe) or 50 μM Fe(III)-EDTA (+Fe) with or without 100 μM NaHS for 15 d. B and C show the dry weight of the –Fe or + Fe plants, respectively. D and E show the chlorophyll content of the –Fe or + Fe plants, respectively. Error bars represents the mean ± SE. * indicates a significant difference at P < 0.05. –Fe, 1 μM Fe; −Fe + NaHS, seedlings treated with 100 μM NaHS and 1 μM Fe; +Fe, 50 μM Fe; +Fe + NaHS, seedlings treated with 100 μM NaHS and 50 μM Fe