Lipid Peroxidation as Biomarker for Evaluating the Level of Toxicity in Nostoc muscorum under Multiple Stress

Heavy metals are chemically or biologically non degradable. Malondialdehyde (MDA) is a cytotoxic product of lipid per oxidation and an indicator of free radical production. We have use lipid per oxidation as biomarker to check the level of toxicity of heterocystous cyanobacteria Nostoc muscorum under single (NaCl, 100mM) and multiple stress (NaCl and chloride of heavy metal, 10μM). Each metal with salt stress has been used as a multiple stress individually. Increase in biomass was observed in some of the test culture show great adaptation in the stress. Result could be summarized as Pb > Mg, Zn > Cd, Mn > Cont > Co. Multiple stressed culture however depicts different results than single stress. Order of toxicity shown as Pb> Mg > Mn > Cd > Zn > Cont > Co. Heterocystous cyanobacterial biofertilizer is an excellent replacement of chemical fertilizer.