Antagonistic Effects of Hydrogen Peroxide and Glutathione on Acclimation to Excess Excitation Energy in Arabidopsis

We demonstrate the effects of hydrogen peroxide and glutathione on acclimatory responses controlled by redox events in the proximity of the quinone B –PQ pools

Barbara Karpinska


Scholarcy highlights

  • The generation of reactive oxygen species3 is an indispensable process for all aerobic organisms
  • H2O2 and Acclimation to excitation energy In the light, the key enzyme involved in H2O2 scavenging in plants is ascorbate peroxidase, which catalyses the reaction inhibit SH-enzymes in the Calvin cycle and to induce cell death mechanisms in plants
  • Photoinhibition of the photosynthetic electron transport developed more slowly in treated leaves, and such leaves showed no visual photodamage in their tissues
  • Treatment of Arabidopsis leaves with 0.5–1 M H2O2 and subsequent exposure to excess light accelerated the permanent photodamage of leaf tissue
  • CONCLUDING REMARKS The stress-responsive systems of mammals and bacteria involve transcription factors that are activated by H2O2 and deactivated by GSH; these factors are designated nuclear factorkappa-B and OxyR, respectively
  • The analogous transcription factors regulated by H2O2 and GSH in plants have not yet been identi ed
  • The NF-j B function has ancient evolutionary origins, and these observations indicate that plants and animals possess analogous stress-responsive systems

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