Alterations in Superoxide Dismutase, Peroxidase, Lipid Peroxidation and Non-protein SH Content in Mung Bean (Vigna radiata) Seedlings Subjected to Ultraviolet-B (UV-B) Radiations

Kawaljeet Kaur and Rajeev Sharma


The stratospheric ozone depletion and enhanced solar
ultraviolet-B (UV-B) irradiance may have adverse impact
on living organisms. The present study is conducted to
study the effect of UV-B radiations for different durations
on the superoxide dismutase, peroxidase, lipid
peroxidation (measured as TBA index) and non-protein
SH content in mung bean seedlings. The study revealed
that the superoxide dismutase and the peroxidase activity
was increasd significantly due to UV-B irradiance. A
significant decrease in lipid peroxidation was observed in
the seedlings exposed to UV-B radiations for longer
durations. The non-protein SH content decreased
significantly on third and fourth day of germination in
mung bean seedlings. Exposure of mung bean
seedlings to UV-B radiations lead to the formation of
reactive oxygen species thus generating oxidative stress.
Thus, the results indicated that superoxide dismutase,
peroxidase, lipid peroxidation and SH metabolism are
associated with the growth of the organism and are
susceptible to alterations by UV-B radiations exposure.

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