Nalini Pandey
(Corresponding author)
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Botany
Department, University of Lucknow, Lucknow -
226 007, India
e-mail: nalini
pandey @rediffmail.com
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Publication Data
Paper received:
12
August 2010
Revised
received:
24
January 2011
Accepted:
16 February 2011
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Abstract
Pea
plants (Pisum sativum
cv. Swati) exposed to
different concentration of cadmium (50, 100, 200 ?M Cd)
under controlled glass house conditions were quantified for different
physiological parameters and antioxidative enzymes.
In pea plants, Cd produced a significant inhibition
of growth and induced chlorosis, marginal yellowing
and necrosis in young leaves, the effect being most pronounced at 200 ?M Cd supply. An alteration in the
activated oxygen metabolism of pea plants were also detected as evidenced by
an increase in concentration of? H2O2
and TBARS along with decrease in the chlorophyll and carotenoid
concentration in leaves. Cadmium toxicity induced an increase in non - protein
thiol, ascorbate, proline and cysteine
concentration. A significant increment in the activity of SOD, APX and GR,
and a decrease in CAT was observed as a result of Cd treatment. The enhanced activity of SOD and inhibition
of CAT and POD produces a high build up of H2O2 which
appears to be the main cause of oxidative stress due to Cd
toxicity in pea plants.
Key
words
Cadmium,
Antioxidative enzymes, Oxidative stress, Pisum sativum
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