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Thickness of leaf mesophyll (TLM) (A), root diameter (RD) (B), diameter of xylem vessels (DXV) (C) and xylem cell wall thickness (TXCW) (D) in 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).
