APC/C-CCS52A Complexes Control Meristem Maintenance in the Arabidopsis Root

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2009 Jun 26

PMID 19553203

Citations 87

Authors

Marleen Vanstraelen

Mikhail Baloban

Olivier Da Ines

Antonietta Cultrone

Tim Lammens

Veronique Boudolf

Spencer C Brown

Lieven De Veylder

Peter Mergaert

Eva Kondorosi

Affiliations

Soon will be listed here.

Abstract

Plant organs originate from meristems where stem cells are maintained to produce continuously daughter cells that are the source of different cell types. The cell cycle switch gene CCS52A, a substrate specific activator of the anaphase promoting complex/cyclosome (APC/C), controls the mitotic arrest and the transition of mitotic cycles to endoreduplication (ER) cycles as part of cell differentiation. Arabidopsis, unlike other organisms, contains 2 CCS52A isoforms. Here, we show that both of them are active and regulate meristem maintenance in the root tip, although through different mechanisms. The CCS52A1 activity in the elongation zone of the root stimulates ER and mitotic exit, and contributes to the border delineation between dividing and expanding cells. In contrast, CCS52A2 acts directly in the distal region of the root meristem to control identity of the quiescent center (QC) cells and stem cell maintenance. Cell proliferation assays in roots suggest that this control involves CCS52A2 mediated repression of mitotic activity in the QC cells. The data indicate that the CCS52A genes favor a low mitotic state in different cell types of the root tip that is required for meristem maintenance, and reveal a previously undescribed mechanism for APC/C mediated control in plant development.

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