J Integr Plant Biol. ›› 2021, Vol. 63 ›› Issue (3): 431-437.DOI: 10.1111/jipb.13014

Special Issue: Abiotic stress Hormone signaling

• Breakthrough Report • Previous Articles     Next Articles

Suppression of DRR1 results in the accumulation of insoluble ubiquitinated proteins, which impairs drought stress tolerance

Seong Gwan Yu1,2, Na Hyun Cho1,2, Jong Hum Kim1,2, Tae Rin Oh1,2 and Woo Taek Kim1,2*   

  1. 1Department of Systems Biology and Division of Life Science, Yonsei University, Seoul 03722, Korea
    2Institute of Life Science and Biotechnology, Yonsei University, Seoul 03722, Korea

    *Correspondence: Woo Take Kim (wtkim@yonsei.ac.kr)
  • Received:2020-08-04 Accepted:2020-09-07 Online:2020-09-10 Published:2021-03-01

Abstract: Drought stress has detrimental effects on plants. Although the abscisic acid (ABA)‐mediated drought response is well established, defensive mechanisms to cope with dehydration‐induced proteotoxicity have been rarely studied. DRR1 was identified as an Arabidopsis drought‐induced gene encoding an ER‐localized RING‐type E3 Ub ligase. Suppression of DRR1 markedly reduced tolerance to drought and proteotoxic stress without altering ABA‐mediated germination and stomatal movement. Proteotoxicity‐ and dehydration‐induced insoluble ubiquitinated protein accumulation was more obvious in DRR1 loss‐of‐function plants than in wild‐type plants. These results suggest that DRR1 is involved in an ABA‐independent drought stress response possibly through the mitigation of dehydration‐induced proteotoxic stress.

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