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Plant and Cell Physiology Advance Access published online on September 4, 2008
Plant and Cell Physiology, doi:10.1093/pcp/pcn130
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved.
The online version of this article has been published under an open access model. Users are entitled to use, reproduce, disseminate, or display the open access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and the Japanese Society of Plant Physiologists are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use, please contact journals.permissions@oxfordjournals.org

MAA3 (MAGATAMA3) helicase gene is required for female gametophyte development and pollen tube guidance in Arabidopsis thaliana

Kentaro K. Shimizu1,2, Toshiro Ito1,3, Sumie Ishiguro1,4 and Kiyotaka Okada1,5,6

1Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-oiwake, Sakyo, Kyoto 606-8502, Japan
2Institute of Plant Biology, University of Zurich, Zollikerstrasse 107, Zurich, CH-8008, Switzerland
3Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore 117604
4Department of Biological Mechanisms and Functions, Graduate School of Bioagricultural Sciences, Nagoya University, Furo, Chikusa, Nagoya 464-8601, Japan
5National Institute for Basic Biology, Myodaiji, Okazaki 444-8585, Japan
6Core Research for Evolutional Science and Technology (CREST), Japan

Corresponding author: Prof. Kentaro K. Shimizu, Institute of Plant Biology, University of Zurich, Zollikerstrasse 107, CH-8008 Zurich, Switzerland, Phone +41-44-634-8247, 8270, FAX +41-44-634-8204, shimizu{at}botinst.uzh.ch


  Abstract

The female gametophyte plays a central role in the sexual reproduction of angiosperms. We previously isolated the maa3 (magatama3) mutant of Arabidopsis thaliana, defective in development of the female gametophyte, micropylar pollen tube guidance, and preventing the attraction of multiple pollen tubes. We here observed that the nucleolus of polar nuclei is small, and that the fusion of polar nuclei often did not occur at the time of pollination. The MAA3 gene encodes a homolog of yeast Sen1 helicase, required for RNA metabolism. It is suggested that MAA3 may regulate RNA molecules responsible for nucleolar organization and pollen tube guidance.

Keywords: Arabidopsis thaliana - female gametophyte - magatama3 (maa3) - nucleolus - pollen tube guidance - Sen1 RNA helicase

(Received July 31, 2008; Accepted August 29, 2008)
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