Organs As B Cu Zn Stems 4 ± 2 a 101 ± 11 a 6 ± 1 a 27 ± 2 a Leaves 8 ±1 a 441 ± 26 c 12 ± 2 b 136 ± 16 bc Male flowers 23 ± 2 b 330 ± 18 b 19 ± 2 c 93 ± 5 b Seeds 24 ± 4 b 649± 117 d 16 ± 3 bc 107 ± 14 b Bracts 21 ± 5 b 463 ± 36 c 30 ± 7 d 159 ± 18 c

Table 3: Arsenic, boron, copper and zinc concentrations (in µg g-1 DW) in stems, leaves, male flowers, seeds and bracts enclosing seeds of Atriplex atacamensis grown on the contaminated site of Quillagua (Number of considered individuals: n=14 for leaves and stems; n=11 for seeds and n=3 for male flowers; for each type of organs, five independent samples were harvested on each plant and each sample was analyzed in triplicates). Means followed by the same letter are not different at P=0.05.