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How do plants respond to copper deficiency?

Hiroaki Yamasaki1, Marinus Pilon, Toshiharu Shikanai

  • 1Graduate School of Agriculture; Kyushu University; Fukuoka, Japan.

Plant Signaling & Behavior
|August 26, 2009
PubMed
Summary

Copper is vital but toxic in excess, so cells regulate it. In low copper conditions, plants use microRNA miR398 to downregulate Cu/Zn superoxide dismutase (SOD) and adapt to metal environments.

Keywords:
chloroplastcopperironmicroRNAplastocyaninsuperoxide dismutase

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Area of Science:

  • Biochemistry
  • Plant Biology
  • Molecular Biology

Background:

  • Copper is an essential transition metal for all organisms, but its excess can be toxic due to free radical production.
  • Cellular copper levels are precisely regulated to prevent toxicity.
  • In higher plants, copper-depleted conditions lead to the downregulation of copper/zinc superoxide dismutase (Cu/Zn SOD) and compensation by iron superoxide dismutase (Fe SOD) in chloroplasts.

Purpose of the Study:

  • To investigate the role of microRNA miR398 in the downregulation of Cu/Zn SOD genes in Arabidopsis thaliana under copper-depleted conditions.
  • To explore the adaptive strategies of different organisms, specifically plants and algae, in response to copper deficiency.

Main Methods:

  • Gene expression analysis in Arabidopsis thaliana grown in low copper (less than 1 microM) tissue culture media.
  • Comparative analysis of copper-responsive mechanisms between higher plants and the green alga Chlamydomonas reinhardtii.

Main Results:

  • Evidence presented implicates microRNA miR398 in the downregulation of Cu/Zn SOD genes in Arabidopsis thaliana under low copper conditions.
  • Chlamydomonas reinhardtii adjusts to copper depletion by replacing copper-containing plastocyanin with iron-containing cytochrome c(6) in its photosynthetic apparatus.

Conclusions:

  • MicroRNA miR398 plays a role in copper homeostasis in plants.
  • Plants have evolved distinct strategies to cope with copper deficiency, likely adapting to diverse metal environments.
  • Evolutionary modifications in response to copper deficiency highlight the adaptability of plant metallo-regulation.