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Plant and Cell Physiology Advance Access originally published online on October 17, 2008
Plant and Cell Physiology 2008 49(12):1907-1910; 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 email: journals.permissions@oxfordjournals.org

Short Communication

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: E-mail, kadota{at}tmu.ac.jp; Fax, +81-42-677–2559.


  Abstract

Branch position in the moss Physcomitrella patens is regulated by blue light. 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. Thus, both weak and strong light responses influence the determination of branch position. Further, light sensitivity of both responses was 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

Abbreviations: SLR, strong light response; WLR, weak light response

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