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Abstract
The present study was conducted to assess the toxicity instigated by Chromium (Cr) stress and alleviating effect of IAA against Cr on biomass, status of photosynthetic pigments and PS II photochemistry of paddy field cyanobacterium. The Cr significantly declined growth and growth regulating processes and apparent increase in oxidative stress biomarkers and antioxidative enzymes. However, upon IAA implication an assuaging effect against Cr toxicity was noticed on growth, pigment content and photosynthesis. The overall study demonstrates that IAA implication significantly improved Cr induced toxicity by improving growth and important metabolic mechanisms like photosynthesis and enzymatic activity.