PJB-2012-297
FAILURE OF SURVIVAL STRATEGIES IN ADAPTION OF HEAVY METAL ENVIRONMENT IN LENS CULINARIS AND PHASEOLUS MUNGO
SABA HAIDER1 AND RAFIA AZMAT2*
Abstract
Lead (Pb)-treated Lens culinaris and Phaseolus mungo seedlings leaves showed considerable reduction in the size with enhance proline and phenol contents while peroxidase and lignin activity was Pb2+ dose dependent. The reduced leaves sizes of both seedlings were correlated with an increase in Pb2+ levels, and activities of peroxidase and lignin deposition in it. The intensification of activities of peroxidase and phenol in the Pb2+ treated plants were accompanied by an increase in the biosynthesis of the lignin contents as their function is of scavenging ROS radical. A strong correlation (r2=0.8570) was observed between Pb2+ and lignin deposition in the Lens culinaris whereas it was non-significant in Phaseolus mungo (r2=0.466). Increased in the lignin contents in the Lens culinaris as a chemical adaptation of the cell walls of various leaves tissues for endurance while decrease in the lignin contents in Phaseolus mungo at high dose of Pb2+may be attributed with the decline in the peroxidase activity. Investigations revealed that although plants adopt several biochemical strategies for their survival but toxicity of Pb2+was significant due to which plant fails to continue in stay alive.
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