Altered cell cycle distribution, hyperplasia, and inhibited differentiation in Arabidopsis caused by the D-type cyclin CYCD3

Dewitte, Walter ORCID: https://orcid.org/0000-0002-0606-1686, Riou-Khamlichi, Catherine, Scofield, Simon ORCID: https://orcid.org/0000-0001-5466-314X, Healy, J. M. Sandra, Jacqmard, Annie, Kilby, Nigel J. and Murray, James A. H. ORCID: https://orcid.org/0000-0002-2282-3839 2002. Altered cell cycle distribution, hyperplasia, and inhibited differentiation in Arabidopsis caused by the D-type cyclin CYCD3. The Plant Cell 15 (1) , pp. 79-92. 10.1105/tpc.004838

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Abstract

CYCD3;1 expression in Arabidopsis is associated with proliferating tissues such as meristems and developing leaves but not with differentiated tissues. Constitutive overexpression of CYCD3;1 increases CYCD3;1-associated kinase activity and reduces the proportion of cells in the G1-phase of the cell cycle. Moreover, CYCD3;1 overexpression leads to striking alterations in development. Leaf architecture in overexpressing plants is altered radically, with a failure to develop distinct spongy and palisade mesophyll layers. Associated with this, we observe hyperproliferation of leaf cells; in particular, the epidermis consists of large numbers of small, incompletely differentiated polygonal cells. Endoreduplication, a marker for differentiated cells that have exited from the mitotic cell cycle, is inhibited strongly in CYCD3;1-overexpressing plants. Transcript analysis reveals an activation of putative compensatory mechanisms upon CYCD3;1 overexpression or subsequent cell cycle activation. These results demonstrate that cell cycle exit in the G1-phase is required for normal cellular differentiation processes during plant development and suggest a critical role for CYCD3 in the switch from cell proliferation to the final stages of differentiation.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences
Publisher:	American Society of Plant Biologists
ISSN:	1040-4651
Last Modified:	27 Oct 2022 08:37
URI:	https://orca.cardiff.ac.uk/id/eprint/62865

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