INVESTIGADORES
BENIMELI claudia susana
artículos
Título:
Bioaccumulation of copper by Zea mays: impact on roots, shoots and leaves growth
Autor/es:
BENIMELI CS; MEDINA A; NAVARRO CM; MEDINA RB; AMOROSO MJ; GÓMEZ MI
Revista:
WATER AIR AND SOIL POLLUTION
Editorial:
SPRINGER
Referencias:
Año: 2009 vol. 210 p. 365 - 370
ISSN:
0049-6979
Resumen:
In the present study, the growth and the
Cu2+accumulation by roots, shoots and leaves of Zea
mays were examined using copper sulphate in the
range of 10−4 to 10−2 M. Plants of Z. mays did not
show inhibition of growth in the presence of 10−4 to
10−2 M Cu2+; however, it was observed growth effects
on root when different Cu2+ solution concentrations
were used. Only the seedlings exposed to 10−2 M
exhibited substantial root growth reduction, yielding
only 56% of length with respect to the control.
Seedlings exposed to 10−4 M Cu2+ exhibited 16%
and 42% growth increase in shoots and leaves,
respectively, when compared with the controls. The
seedlings treated with 10−3 and 10−2 M Cu2+ were
inhibited in shoot and leaf growth. The fresh weights in
roots, shoots and leaves significantly decreased at 10−2
M Cu2+. The tolerance index, based on root length, was
not significantly different for the three different treatments
with copper. However, the total accumulation rate
was very low at 10−4 and 10−3 M compared to 10−2 Cu
treatments. The capacity of copper accumulation by
roots, shoots and leaves of Z. mays plants increased
concomitant to the copper concentration, arriving to
382 times more in roots, 157 in shoots and only 16 in
leaves, all compared to the controls. Cu could be
accumulated by roots, shoots and leaves when the initial
concentrations were 10−3 and 10−4 M. However, when
it was 10−2 M, the metal could not be accumulated by
leaf and shoot levels; the roots could increase their
copper accumulation capacity three times compared to
the control. Z. mays has potential ability to accumulate
Cu without being overly sensitive to Cu toxicity.