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Assessment of Osmolyte Accumulation in Heavy Metal Exposed Salvinia natans |
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B. Dhir,
S.A. Nasim,
S. Samantary and S. Srivastava |
Abstract:
Accumulation of osmolytes in terrestrial plants in response
to environmental stresses is well reported and information about aquatic plants
is limited. Present study aimed to investigate if the aquatic weed, Salvinia
natans accumulates osmolytes/compatible solutes on exposure to various heavy
metals. Plants exposed to heavy metals viz. Cd, Cu, Ni, Cr, Mn, Fe, Co, Pb and
Zn, were harvested after 48 h and various osmolytes including sucrose, mannitol,
proline, glycine betaine and polyamines were estimated using biochemical methods.
Results suggested that heavy metal stress does trigger the accumulation of osmolytes
such as sucrose, mannitol and glycine betaine. In contrast proline accumulation
was not observed. Studies of heavy metal stress on the endogenous levels of
polyamines showed presence of free polyamines, while conjugated and bound forms
were not detected. Among free polyamines, Putrescine (Put) and Spermidine (Spd)
did not show significant decrease in heavy metal exposed Salvinia except
Pb and Fe exposed plants. Spermine (Spm) content showed decline in heavy metal
exposed Salvinia. The decrease in polyamine levels indicated their possible
role in combating oxidative stress induced by heavy metals. Studies suggest
that accumulation of osmolytes under heavy metal stress might help in imparting
tolerance in Salvinia.
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How to cite this article:
B. Dhir, S.A. Nasim, S. Samantary and S. Srivastava, 2012. Assessment of Osmolyte Accumulation in Heavy Metal Exposed Salvinia natans. International Journal of Botany, 8: 153-158.
DOI: 10.3923/ijb.2012.153.158
URL: https://scialert.net/abstract/?doi=ijb.2012.153.158
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