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Its role in accelerating the nitrogen fixation in legumes is now well established. Cobalt, a critical cobalamin component, is needed for several enzyme and coenzyme operations. In this chapter, the impact of Co in plant life is reviewed along with stress caused by this metal and ways to overcome its detrimental effects. However, if their level increased, it leads to toxicity and often has adverse effects on plant life. When present in iota amounts, metals such as copper (Cu), cobalt (Co), manganese (Mn), chromium (Cr) and zinc (Zn) are essential to plant metabolism and play a significant role in plant growth and productivity. Out of these, some of the heavy metals are substantial environmental pollutants and produce toxic effects which create ecological havoc. Several metals modulate and monitor growth in addition to physiological as well as biochemical processes in plants.
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