Failure of survival strategies in adaption of heavy metal environment in lens culinaris and Phaseolus mungo

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.