The findings obtained in this in situ research demonstrated that native
tolerant species growing in lead polluted soils suffer a reduction of
their natural translocation and bioaccumulation natural capabilities.
This phenomenon implies a strategy change from hyper-accumulator
or accumulator to excluder. However, some species conserved the ability
to accumulate significant amounts of Pb in specific soil conditions.
These species are T. minuta and B. pilosa, and they were metal-tolerant
and could accumulate more Pb than other studied plants. On
the other hand, these species present suitable characteristics for
phytoremediation of Pb polluted soils. Therefore, further studies should
be carried out and controlled experiments (with different conditions of
soil, amendment uses, and other influencing factors) are required to
determine the conditions in which these species are applicable and to
evaluate the possibility of enhancing their Pb uptake rates to ameliorate
TF and BCF.