The endoplasmic reticulum-associated degradation is necessary for plant salt tolerance

Cell Res. 2011 Jun;21(6):957-69. doi: 10.1038/cr.2010.181. Epub 2010 Dec 28.


Eukaryotic organisms have quality-control mechanisms that allow misfolded or unassembled proteins to be retained in the endoplasmic reticulum (ER) and subsequently degraded by ER-associated degradation (ERAD). The ERAD pathway is well studied in yeast and mammals; however, the biological functions of plant ERAD have not been reported. Through molecular and cellular biological approaches, we found that ERAD is necessary for plants to overcome salt stress. Upon salt treatment ubiquitinated proteins increased in plant cells, especially unfolded proteins that quickly accumulated in the ER and subsequently induced ER stress responses. Defect in HRD3A of the HRD1/HRD3 complex of the ERAD pathway resulted in alteration of the unfolded protein response (UPR), increased plant sensitivity to salt, and retention of ERAD substrates in plant cells. Furthermore, we demonstrated that Ca(2+) release from the ER is involved in the elevation of UPR and reactive oxygen species (ROS) participates the ERAD-related plant salt response pathway.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents / pharmacology
  • Arabidopsis / physiology*
  • Arabidopsis Proteins / genetics
  • Arabidopsis Proteins / metabolism*
  • Calcium Signaling / drug effects
  • Endoplasmic Reticulum / metabolism*
  • Gene Knockout Techniques
  • Membrane Proteins / genetics
  • Membrane Proteins / metabolism*
  • Molecular Chaperones / genetics
  • Molecular Chaperones / metabolism
  • Phenotype
  • Protein Kinases / genetics
  • Protein Kinases / metabolism
  • Reactive Oxygen Species / metabolism
  • Salt-Tolerant Plants / genetics
  • Salt-Tolerant Plants / metabolism*
  • Stress, Physiological
  • Tunicamycin / pharmacology
  • Ubiquitination
  • Unfolded Protein Response*


  • Anti-Bacterial Agents
  • Arabidopsis Proteins
  • HRD3A protein, Arabidopsis
  • Membrane Proteins
  • Molecular Chaperones
  • Reactive Oxygen Species
  • Tunicamycin
  • Protein Kinases
  • BRI1 protein, Arabidopsis