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Plant and Cell Physiology Advance Access first published online on January 12, 2009
This version published online on January 19, 2009
Plant and Cell Physiology, doi:10.1093/pcp/pcp003
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© The Author 2009. 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

The AtXTH28 gene, a xyloglucan endotransglucosylase/hydrolase, is involved in automatic self-pollination in Arabidopsis thaliana

Kasumi Kurasawa1, Akihiro Matsui1,§, Ryusuke Yokoyama1, Tomoko Kuriyama2, Takeshi Yoshizumi2, Minami Matsui2, Keita Suwabe3, Masao Watanabe3,4 and Kazuhiko Nishitani1,*

1 Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Sendai 980-8578, Japan
2 Plant Functional Genomics Research Team, Plant Functional Genomics Research Group, Plant Science Center, RIKEN Yokohama Institute, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
3 Department of Environmental Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai 980-8577, Japan
4 The 21st Century Center of Excellence Program, IwateUniversity, Morioka 020-8550, Japan

*Corresponding author: Kazuhiko Nishitani, E-mail, nishitan{at}m.tains.tohoku.ac.jp


  Abstract

Successful automatic self-pollination in flowering plants is dependent on the correct development of reproductive organs. In the stamen, the appropriate growth of the filament, which largely depends on mechanical properties of the cell wall, is required to position the anther correctly close to the stigma at the pollination stage. Xyloglucan endotransglucosylase/hydrolases (XTHs) are a family of enzymes that mediate the construction and restructuring of xyloglucan cross-links, thereby controlling the extensibility or mechanical properties of the cell wall in a wide variety of plant tissues. Our reverse genetic analysis has revealed that a loss-of-function mutation of an Arabidopsis XTH family gene, AtXTH28, led to a decrease in capability of self-pollination, probably due to inhibition of stamen filament growth. Our results also suggest that the role of AtXTH28 in the development of the stamen is not functionally redundant with its closest paralog, AtXTH27. Thus, our finding indicates that AtXTH28 is specifically involved in the growth of stamen filaments, and is required for successful automatic self-pollination in certain flowers in Arabidopsis thaliana.

Keywords: Arabidopsis - Cell wall - Self-pollination - Stamen filament - XTH

§Present address: Plant Genomic Network Research Team, Plant Functional Genomics Research Group, Plant Science Center, RIKEN Yokohama Institute, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan

(Received November 26, 2008; Accepted January 4, 2009)
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