Tolerance to Fe deficiency in transformants with the introduced OsIRT1 promoter refre1/372 grown in calcareous soil. a Transformants (TF, left) and vector controls (V, center) after 4 weeks of growth in a calcareous soil; vector controls (V, right) in bonsol (normal cultivated soil). b Transformant (TF, left) and vector control (V, right) after 17 weeks of growth in calcareous soil. c Grain yield after cultivation for 17 weeks in calcareous soil. Original figure: Ishimaru et al. .