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Li T, Wang Y, Natran A, Zhang Y, Wang H, Du K, Qin P, Yuan H, Chen W, Tu B, Inzé D, Dubois M. C-TERMINAL DOMAIN PHOSPHATASE-LIKE 3 contributes to GA-mediated growth and flowering by interaction with DELLA proteins. New Phytol 2024. [PMID: 38594216 DOI: 10.1111/nph.19742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 03/14/2024] [Indexed: 04/11/2024]
Abstract
Gibberellic acid (GA) plays a central role in many plant developmental processes and is crucial for crop improvement. DELLA proteins, the core suppressors in the GA signaling pathway, are degraded by GA via the 26S proteasomal pathway to release the GA response. However, little is known about the phosphorylation-mediated regulation of DELLA proteins. In this study, we combined GA response assays with protein-protein interaction analysis to infer the connection between Arabidopsis thaliana DELLAs and the C-TERMINAL DOMAIN PHOSPHATASE-LIKE 3 (CPL3), a phosphatase involved in the dephosphorylation of RNA polymerase II. We show that CPL3 directly interacts with DELLA proteins and promotes DELLA protein stability by inhibiting its degradation by the 26S proteasome. Consequently, CPL3 negatively modulates multiple GA-mediated processes of plant development, including hypocotyl elongation, flowering time, and anthocyanin accumulation. Taken together, our findings demonstrate that CPL3 serves as a novel regulator that could improve DELLA stability and thereby participate in GA signaling transduction.
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Affiliation(s)
- Ting Li
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, 611130, Chengdu, China
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Gent, Belgium
- Center for Plant Systems Biology, VIB, 9052, Gent, Belgium
| | - Yongqin Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, 611130, Chengdu, China
| | - Annelore Natran
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Gent, Belgium
- Center for Plant Systems Biology, VIB, 9052, Gent, Belgium
| | - Yi Zhang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, 611130, Chengdu, China
| | - Hao Wang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Rice Research Institute, Sichuan Agricultural University, 611130, Chengdu, Sichuan, China
| | - Kangxi Du
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Rice Research Institute, Sichuan Agricultural University, 611130, Chengdu, Sichuan, China
| | - Peng Qin
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Rice Research Institute, Sichuan Agricultural University, 611130, Chengdu, Sichuan, China
| | - Hua Yuan
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, 611130, Chengdu, China
| | - Weilan Chen
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Rice Research Institute, Sichuan Agricultural University, 611130, Chengdu, Sichuan, China
| | - Bin Tu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Rice Research Institute, Sichuan Agricultural University, 611130, Chengdu, Sichuan, China
| | - Dirk Inzé
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Gent, Belgium
- Center for Plant Systems Biology, VIB, 9052, Gent, Belgium
| | - Marieke Dubois
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Gent, Belgium
- Center for Plant Systems Biology, VIB, 9052, Gent, Belgium
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