Mercury induced oxidative stress, DNA damage, and activation of antioxidative system and Hsp70 induction in duckweed ( Lemna minor )

genomic template stability acts as bioindicator to assess health status of L. minor

Tingting Zhang

2017

Scholarcy highlights

  • genomic template stability acts as bioindicator to assess health status of L. minor
  • Mercury uptake and its effects on physiology, biochemistry and genomic stability were investigated in Lemna minor after 2 and 6 d of exposure to 0–30 μM Hg
  • The accumulation of Hg increased in a concentration- and duration-dependent manner, and was positively correlated with the leaf damage
  • Oxidative stress after Hg exposure was evidenced in L. minor by a significant decrease in photosynthetic pigments, an increase in malondialdehyde and lipoxygenase activities
  • The accumulation of Hsp70 indicated the occurrence of a heat shock response at all Hg concentrations. These results suggest that L. minor plants were able to cope with Hg toxicity through the activation of various mechanisms involving enzymatic and non-enzymatic antioxidants, up-regulation of proline, and induction of Hsp70

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