Phytotoxicity of cadmium on protein, proline and antioxidant enzyme activitiesin growing Arachis hypogaea L. seedlings
N Dinakar , P C Nagajyothi , S Suresh , Y Udaykiran , T Damodharam
DOI:
Received April 22, 2007,Revised July 12, 2007, Accepted , Available online
Volume 20,2008,Pages 199-206
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Phytotoxicity of cadmium on growing Arachis hypogaea L. seedlings was studied. Seeds were exposed to 25, 50, and 100 mol/L
CdCl2 concentrations, for a period of 10, 15, 20 and 25 d. The extent of damage to chlorophyll, protein, proline, nitrate and nitrite
reductase, antioxidant enzyme activity in leaves and roots were evaluated after 10 d of cadmium stress. The higher concentration
of cadmium (100 mol/L) resulted (leaves and roots) total chlorophyll 91.01%, protein 79.51%, 83.61%, nitrate reductase 79.39%,
80.72% and nitrite reductase 77.07%, 75.88% activity decreased with increase in cadmium concentrations and exposure periods.
Cadmium caused significant changes in the activity of antioxidative enzymes. Contrastingly Cd treated plant tissues showed an increase
in proline 159.87%, 239.6%, gluthion reductase (GR) 337.72%, 306.14%, superoxide disumutase (SOD) 688.56%, 381.72%, ascorbate
peroxidase (APX) 226.47%, 252.14%, peroxidase (POD) 72.19%, 60.29% and catalase (CAT) 228.96%, 214.74% as compared to
control. Cadmium stress caused a significant increase in the rate of SOD activity in leaves and roots of plant species. Results show the
crop A. hypogaea is highly sensitive even at very low cadmium concentrations.
