Hydroponically grown Acanthus ilicifolius were exposed to different
concentrations of NaCl (200, 400 and 600 mM) for 15d in order to characterize
the potential of antioxidant system. In this study, our focus was to determine
the NaCl tolerance potential of A. ilicifolius, on the basis of extend of lipid
peroxidation, antioxidant enzyme activity and osmoregulation mechanism when
subjected to high NaCl concentration. Antioxidant enzymes (SOD, CAT, GPX and
APX) showed an enhanced activity in all the treatments and the increased
activity was more significant in 400 mM treated plants. In 600 mM treated
plants, a decrease in activity of antioxidant enzymes, accumulation of
antioxidant molecules and malondialdehyde content was recorded upon increasing
the treatment period. However, the PPO activity and ascorbate content showed
reduction in all the treatments as compared to the control. These results
indicates that A. ilicifolius exhibits efficient tolerance to NaCl upto a level
of 400 mM, beyond which it turns to be intolerable. It can be concluded that,
short term exposure to NaCl could trigger the stress tolerating mechanism of
salt excreting mangrove A. ilicifolius. - See more at:
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