Mercury is one of the most toxic heavy metals present in the earth’s crust. It has been considered as environmental pollutant because of its potent toxicity to plants and humans. In this review, we discuss mercury toxicity responses on plant metabolism and its detoxification mechanism by phytochelatins and antioxidant enzymes. Some light is also shed on selenium antagonistic study with mercury. Due to its potential toxicity, it has attracted attention in fields of soil science and plant nutrition. Mercury has harmful toxic effects on the molecular and physiobiochemical behavior of plants. Mostly research work has been done on seed germination, and shoot, root, and leaf morphology. Enzyme responses with respect to mercury as a result Hg accumulated in food chain is also reviewed here. Hence, this review may provide a compiled data for other researches in this direction, to provide a better mechanism or details about mercury’s noxious effect in the ecosystem.

One of the many new risks that effecting the early societies is the continuous exposure to pollutants, namely, heavy metals. Mercury (Hg) is perhaps the metal which has attracted the most attention in soil science and plant nutrition due to its potential toxicity to ecosystem. In the present study, the toxic effect of mercury was determined by morphological and physiological parameter on plant Phaseolus vulgaris. In germination studies, parameters such as germination percentage, root length, and shoot length were decreased with increasing dose of mercuric chloride (HgCl2) concentrations. Mercury also showed inhibition property towards physiological parameters such as chlorophyll, protein, nitrate, and endogenous pool. Higher concentrations of HgCl2 were found to be more toxic.

<p>Herbal medicine is in demand due to its fewer side effects and more or better curable techniques. The <em>Tephrosia purpurea</em>, claimed to be healing, curing and lower the various diseases according to Indian medicinal history. This genera species is well known for its therapeutic purpose, in this review we are explaining about the T.P most important characteristics which have been reported. This plant due to its good antioxidant and antibacterial property show best medicine against various diseases such as diuretic, cyto-toxicity and diabetics. </p>

Mercury is known to disrupt the biological function in plants by inhibiting their growth and developmental process, while selenium (Se) is an essential micronutrient within the appropriate amount. This paper is aimed to study co application and interactive effects of selenium (Se) and mercury (Hg) on the Nitrate Reductase NR (such as in-vivo and endogenous) and the antioxidant system through a pot experiment and clarify the possible mechanism how Se alleviates the toxicity of Hg. The observations indicate that when selenium applied after mercury exposure the enzyme activity enhanced hence Se may reduce the toxic level of Hg in phaseolus vulgaris.