Presence of heavy metals in the soil and water is an inevitable
evil in modern day due to industrialization. Heavy metal stress is
one of the major abiotic stresses that cause environmental
pollution in recent decades. These metals unlike other organic
pollutants are not degraded and converted into harmless compounds
via biological processes. Hence, they can persist for a long time
in the environment and enter into food chain. The effects of
aluminium and zinc on growth and Biochemical components were
investigated in 20 days old seedlings of Pennisetum americanum (L).
Leek and Phaseolus aureus in Hoagland's solution spiked with
various concentrations of aluminium and zinc. Total chlorophyll
content, glucose and protein declined progressively with increasing
the concentration of heavy metals. A significant increase of
proline, amino acids and other enzymes were detected in primary
leaves after exposure to heavy metals. The strongest effect on
these chemicals was found in plants exposed to Aluminium.
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