Journal
PLANT PHYSIOLOGY
Volume 149, Issue 2, Pages 874-884Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1104/pp.108.132449
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Funding
- University of Wisconsin Predoctoral Training Program in Genetics [5 T32 GM07133]
- National Science Foundation [IOS-0642865, IOS -0821884]
- National Natural Science Foundation of China [30570933, 30628004]
- University of Wisconsin Botany Department and Genetics Department
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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 (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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