Such a
situation was indeed observed in tomato (Akinci et al., 2010).
The extent of lead accumulation seems to vary with plant age;
thus when exposed to 3 mM Pb, 6 day-old seedlings accumulated
lead at 1.2 mg g1 dry weight (Lamhamdi et al., 2011),
compared with 0.36 mg g1 in the present experiments using
30 day-old plants Table 2.