Agriculture Reference
In-Depth Information
Figure 4. Changes in the Ni concentration (µg.g
-1
DW) in the shoots and the roots of
S. portulacastrum
and
M. crystallinum
plants subjected to B/B (two halves of the root system in basal medium), B/Ni (one
half of the root system in basal medium and the other half in basal medium added with 50 µM Ni
2+
) and
Ni/Ni (Two halves of the root system in basal medium added with 50 µM Ni
2+
) treatments. The
numbers inside the bars are the amounts of Ni accumulated in the shoots and the roots (µg.plant
-1
).
Means of 8 replicates. Bars marked with same letter are not significantly different at p= 0.05.
However these effects were more pronounced in
Mesembryanthemum
. Indeed, compared to
B/B plants, this decrease reached respectively 26 and 30 %
in Cd/Cd and Ni/Ni plants
in
Sesuvium
and it was 55 and 60 % in
Mesembryanthemum
.
As compared to Cd/Cd or Ni/Ni plants, culture on dual medium led to significant increase
of shoot K
+
status. In both species, K
+
shoot-concentration was similar in B/B and B/Cd or
B/Ni plants. Changes in the mean quantities of K
+
(mmol.plant
-1
) accumulated in shoots are
represented in Table 2. K
+
amounts measured in B/Cd or B/Ni plants were 2 to 5 fold higher
than those of Cd/Cd or Ni/Ni plants, respectively in
Sesuvium
and
Mesembryanthemum
.
