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.
Bibliographical noteFunding Information:
This work was supported by grants from the National Research Foundation (Mid‐Career Researcher Program 2020R1A2B5B02001590 and Basic Science Research Program 2018R1A6A1A03025607, Republic of Korea) to W.T.K. S.G.Y was the recipient of a Hyundai Motor Chung Mong‐Koo Foundation Scholarship.
All Science Journal Classification (ASJC) codes
- Biochemistry, Genetics and Molecular Biology(all)
- Plant Science