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JXB Advance Access published online on February 28, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri122
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Journal of Experimental Botany © Society for Experimental Biology 2005; all rights reserved
Received October 9, 2004
Accepted January 14, 2005

RESEARCH PAPER

Ectopic endoreduplication caused by sterol alteration results in serrated petals in Arabidopsis

Yoshihiro Hase 1*, Shozo Fujioka 2, Shigeo Yoshida 2, Guoqing Sun 1, Masaaki Umeda 3, and Atsushi Tanaka 1

1 Department of Ion-Beam-Applied Biology, JAERI (Japan Atomic Energy Research Institute), Watanuki-machi 1233, Takasaki, Gunma 370-1292, Japan
2 RIKEN (The Institute of Physical and Chemical Research), Wako-shi, Saitama 351-0198, Japan
3 Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan

* To whom correspondence should be addressed.
Yoshihiro Hase, E-mail: hase{at}taka.jaeri.go.jp


  Abstract

The Arabidopsis frill1 (frl1) mutant, that has serrated petals and sepals but no other large changes in plant morphology, was studied. The frl1 had a mutation in STEROL METHYLTRANSFERASE 2 and an altered sterol composition. It was found that the frl1 mutation causes ectopic endoreduplication in petal tips that do not normally endoreduplicate. The rosette leaves of frl1 also showed an enhanced level of endoreduplication, but their morphology was hardly affected. These facts suggest that the suppression of endoreduplication is important for petal morphogenesis and the normal sterol composition is required for this suppression.

Keywords: Arabidopsis thaliana; endoreduplication; frill1; petal; SMT2; sterol.
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