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JXB Advance Access originally published online on February 28, 2005
Journal of Experimental Botany 2005 56(414):1263-1268; doi:10.1093/jxb/eri122
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org

RESEARCH PAPER

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

Yoshihiro Hase1,*, Shozo Fujioka2, Shigeo Yoshida2, Guoqing Sun1, Masaaki Umeda3 and Atsushi Tanaka1

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

* To whom correspondence should be addressed. Fax: +81 27 346 9480. E-mail: hase{at}taka.jaeri.go.jp

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.

Key words: Arabidopsis thaliana, endoreduplication, frill1, petal, SMT2, sterol


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