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Cross sections of roots under light microscopy (LM) and scanning electron microscopy (SEM) of sweet orange trees grafted on Swingle (LM: A–C; SEM: G–I) or Sunki (LM: D–F; SEM: J–L) rootstocks grown in nutrient solution with varying concentrations of B for 130 days. Concentration of nutrient solution, in mg L-1 of boron: left (0.01), center (0.5), and right (5.0) columns. Legend: PR, parenchyma; XL, xylem; PL, phloem.
