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Plant and Cell Physiology Advance Access published online on October 17, 2008
Plant and Cell Physiology, doi:10.1093/pcp/pcn158
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Phototropin-dependent weak and strong light responses in the determination of branch position in the moss Physcomitrella patens

Hidetoshi Uenaka and Akeo Kadota

Department of Biological Sciences, Graduate School of Science and Engineering, Tokyo Metropolitan University, Minami-Ohsawa 1-1, Hachioji, Tokyo 192-0397, Japan

Corresponding author: Dr. Akeo Kadota, Department of Biological Sciences, Graduate School of Science and Engineering, Tokyo Metropolitan University, Minami-Ohsawa 1-1, Hachioji, Tokyo 192-0397, Japan, Tel.: +81-42-677-2563, Fax: +81-42-677-2559, E-mail: kadota@tmu.ac.jp


  Abstract

Branch position in the moss Physcomitrella patens is regulated by blue light (Uenaka et al., 2005). In this study, fluence rate dependency of branch position determination was investigated by partial cell irradiation with a microbeam. With a 30 Wm-2 or lower fluence rate, branches formed at the microbeam area, but formed outside the microbeam when the fluence rate was raised to 200 Wm-2 or higher. Thus, both weak and strong light responses influence the determination of branch position. Further, light sensitivity of both responses were reduced in phototropin knock-out lines, revealing an involvement of phototropin as the blue light receptor.

Keywords: Branch formation - Cryptochrome - Photomorphogenesis - Phototropin Physcomitrella patens - Polarity

(Received September 22, 2008; Accepted October 14, 2008)
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