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Hydrogen peroxide was located using two different techniques: in vivo labelling of hydrogen peroxide using DCFH-DA, located by laser confocal microscopy (A, B, E, and F), and the cerium chloride precipitation technique, located by transmission electron microscopy (C, D, G, and H). Zone I (A, B, C, and D) and zone II (E, F, G, and H) of Brassica oleracea roots grown under control conditions (A, C, E, and G) and with 80 mM NaCl (B, D, F, and H) during 14 d.
