Effect of heavy metals on biochemical profile of Azolla filiculoides

The species of Azolla (Water fern) are small, delicate, moss- like plants with fragile rhizomes covered by crowded overlapping leaves. They are highly productive plants that double their biomass in 3–10 days. They form an endo symbiotic relationship with the diazotrophic cyanobacterium Anabaena azollae, which fixes atmospheric nitrogen, giving the plant access to the essential nutrient.