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Takatsuka H, Nomoto Y, Yamada K, Mineta K, Breuer C, Ishida T, Yamagami A, Sugimoto K, Nakano T, Ito M. MYB3R-SCL28-SMR module with a role in cell size control negatively regulates G2 progression in Arabidopsis. Plant Signal Behav 2023; 18:2153209. [PMID: 36576149 PMCID: PMC10761098 DOI: 10.1080/15592324.2022.2153209] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Revised: 11/24/2022] [Accepted: 11/24/2022] [Indexed: 06/17/2023]
Abstract
Cell size control is one of the prerequisites for plant growth and development. Recently, a GRAS family transcription factor, SCARECROW-LIKE28 (SCL28), was identified as a critical regulator for both mitotic and postmitotic cell-size control. Here, we show that SCL28 is specifically expressed in proliferating cells and exerts its function to delay G2 progression during mitotic cell cycle in Arabidopsis thaliana. Overexpression of SCL28 provokes a significant enlargement of cells in various organs and tissues, such as leaves, flowers and seeds, to different extents depending on the type of cells. The increased cell size is most likely due to a delayed G2 progression and accelerated onset of endoreplication, an atypical cell cycle repeating DNA replication without cytokinesis or mitosis. Unlike DWARF AND LOW-TILLERING, a rice ortholog of SCL28, SCL28 may not have a role in brassinosteroid (BR) signaling because sensitivity against brassinazole, a BR biosynthesis inhibitor, was not dramatically altered in scl28 mutant and SCL28-overexpressing plants. Collectively, our findings strengthen a recently proposed model of cell size control by SCL28 and suggest the presence of diversified evolutionary mechanisms for the regulation and action of SCL28.
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Affiliation(s)
- Hirotomo Takatsuka
- School of Biological Science and Technology, College of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
| | - Yuji Nomoto
- School of Biological Science and Technology, College of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
| | - Kesuke Yamada
- School of Biological Science and Technology, College of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
| | - Keito Mineta
- School of Biological Science and Technology, College of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
| | - Christian Breuer
- RIKEN Center for Sustainable Resource Science, Yokohama, 230-0045, Japan
| | - Takashi Ishida
- RIKEN Center for Sustainable Resource Science, Yokohama, 230-0045, Japan
- Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto, 860-8555, Japan
| | - Ayumi Yamagami
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
- Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, Tsukuba, Japan
| | - Keiko Sugimoto
- RIKEN Center for Sustainable Resource Science, Yokohama, 230-0045, Japan
- Department of Biological Sciences, Graduate School of Science, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-0033, Japan
| | - Takeshi Nakano
- Graduate School of Biostudies, Kyoto University, Kyoto, Japan
- Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, Tsukuba, Japan
- School of Engineering and Applied Sciences, National University of Mongolia, Ulaanbaatar, Mongolia
| | - Masaki Ito
- School of Biological Science and Technology, College of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
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