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Boron accumulation in leaves (A), roots (B), and whole plant (C) of sweet orange trees grafted on Swingle or Sunki rootstocks grown in nutrient solution with varying concentrations of boron for 130 days. Asterisks compare rootstocks in a given boron concentration, whereas lowercase letters indicate significant difference between boron concentrations in a given rootstock (Tukey test at p < 0.05).
