SCARECROW‐LIKE28 modulates organ growth in Arabidopsis by controlling mitotic cell cycle exit, endoreplication, and cell expansion dynamics

Summary The processes that contribute to plant organ morphogenesis are spatial–temporally organized. Within the meristem, mitosis produces new cells that subsequently engage in cell expansion and differentiation programs. The latter is frequently accompanied by endoreplication, being an alternative...

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Bibliographic Details
Published in:	The New phytologist 2023-03, Vol.237 (5), p.1652-1666
Main Authors:	Goldy, Camila, Barrera, Virginia, Taylor, Isaiah, Buchensky, Celeste, Vena, Rodrigo, Benfey, Philip N., De Veylder, Lieven, Rodriguez, Ramiro E.
Format:	Article
Language:	eng
Subjects:	Arabidopsis Arabidopsis - metabolism Arabidopsis Proteins - genetics Arabidopsis Proteins - metabolism Assembly Biogenesis Biosynthesis Cell cycle Cell Cycle - genetics Cell Cycle Proteins - metabolism Cell differentiation Cell division cell expansion Cell Proliferation Cell walls Cells Cytoskeleton Deoxyribonucleic acid Differentiation DNA Dynamics Endoreduplication endoreplication Gene expression Gene Expression Regulation, Plant Kinases Leaves Meristems Mitosis mitotic cell cycle exit Morphogenesis Nuclear division Ploidy Proliferation root SCARECROW‐LIKE28 SIAMESE/SIAMESE‐RELATED Transcription
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Summary:	Summary The processes that contribute to plant organ morphogenesis are spatial–temporally organized. Within the meristem, mitosis produces new cells that subsequently engage in cell expansion and differentiation programs. The latter is frequently accompanied by endoreplication, being an alternative cell cycle that replicates the DNA without nuclear division, causing a stepwise increase in somatic ploidy. Here, we show that the Arabidopsis SCL28 transcription factor promotes organ growth by modulating cell expansion dynamics in both root and leaf cells. Gene expression studies indicated that SCL28 regulates members of the SIAMESE/SIAMESE‐RELATED (SIM/SMR) family, encoding cyclin‐dependent kinase inhibitors with a role in promoting mitotic cell cycle (MCC) exit and endoreplication, both in response to developmental and environmental cues. Consistent with this role, mutants in SCL28 displayed reduced endoreplication, both in roots and leaves. We also found evidence indicating that SCL28 co‐expresses with and regulates genes related to the biogenesis, assembly, and remodeling of the cytoskeleton and cell wall. Our results suggest that SCL28 controls, not only cell proliferation as reported previously but also cell expansion and differentiation by promoting MCC exit and endoreplication and by modulating aspects of the biogenesis, assembly, and remodeling of the cytoskeleton and cell wall.
ISSN:	0028-646X 1469-8137