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Published on December 12, 2008; 10.1104/pp.108.132449

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Received November 10, 2008
Accepted December 5, 2008

FZR2/CCS52A1 Expression Is A Determinant of Endoreduplication and Cell Expansion in Arabidopsis thaliana

Zachary Larson-Rabin *, Ziyu Li , Patrick H. Masson , and Christopher D. Day

University of Wisconsin, Laboratory of Genetics, Madison, WI 53706 USA; State Key Laboratory of Genetic Engineering, Institute of Plant Biology, School of Life Sciences, Fudan University, Shanghai 200433, China

* Corresponding author; email: zmlarson{at}wisc.edu.

Endoreduplication, a modified cell cycle that allows cells to increase ploidy without subsequent cell division, is a key component of plant growth and development. In this work, we show that some, but not all, of the endoreduplication of Arabidopsis thaliana is mediated by the expression of a WD40 gene, FIZZY-RELATED2 (FZR2). Loss-of-function alleles show reduced endoreduplication and reduced expansion in trichomes and other leaf cells. Misexpression of FZR2 is sufficient to drive ectopic or extra endoreduplication in leaves, roots, and flowers, leading to alteration of cell sizes and, sometimes, organ size and shape. Our data, which suggest that reduced cell size can be compensated by increased cell proliferation to allow normal leaf morphology, are discussed with respect to the so-called compensation mechanism of plant development.




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