Agriculture Reference
In-Depth Information
medium and having any direct contact with Cd
2+
showed a relatively high Cd
2+
concentration
reaching 330 µg/gDW in both species.
Figure 2. Changes in whole plant, shoots and roots dry weight (g.plant
-1
) produced by
S. portulacastrum
(A) and
M. crystallinum
(B) grown 30 days in a split-root system. B: standard nutrient solution; Cd:
standard nutrient solution supplemented with 100 µM Cd
2+
; Ni: standard nutrient solution
supplemented with 50 µM Ni
2+
. Means of 8 replicates. Bars marked with same letter are not
significantly different at p= 0.05.
Ni
2+
Accumulation
Ni
2+
was less accumulated than Cd
2+
in the different plant tissues. Indeed, in
Sesuvium,
this metal was not detected in the shoot of plants subjected to B/Ni treatment and did not
exceed 12 µg/g DW in Ni/Ni treated plants (Figure 4A). In
Mesembryanthemum,
shoot-Ni
2+
concentrations reached 49µg/g DW in B/Ni plants, which represents 43% of those measured
in Ni/Ni plants. Ni
2+
was not detected in the root part of B/Ni plants of
Sesuvium
developed in
basal medium. In the other half of roots immersed medium containing 50 µM Ni, Ni
2+
concentration represent 32% as compared to those of Ni/Ni plants (Figure 4B).
As compared to
Sesivium
,
Mesembryanthemum
accumulated more Ni
2+
in the roots.
Indeed, this parameter reached 1000 µg/g DW in the root developed in medium containing 50
