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Plant and Cell Physiology Advance Access published online on May 15, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm057
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© The Author 2007. 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

Phototropins and neochrome1 mediate nuclear movement in the fern Adiantum capillus-veneris

Hidenori Tsuboi1,2, Noriyuki Suetsugu1, Hiroko Toyooka-Kawai1,3 and Masamitsu Wada1

1 Division of Photobiology, National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
2 Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University,1-1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan
3 Present address: Nishii Initiative Research Unit, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Corresponding author: Masamitsu Wada. Division of Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan. TEL: 81-564-55-7610, Fax: 81-564-55-7611, E-mail: wada{at}nibb.ac.jp


  Abstract

In gametophytic cells (prothalli) of the fern Adiantum capillus-veneris, nuclei as well as chloroplasts change their position according to light conditions. Nuclei reside on anticlinal walls in darkness and move to periclinal or anticlinal walls under weak or strong light conditions, respectively. Here we reveal that red light-induced nuclear movement is mediated by neochrome1 (neo1), blue light-induced movement is redundantly mediated by neo1, phototropin2 (phot2) and possibly phot1, and dark positioning of both nuclei and chloroplasts is mediated by phot2. Thus, both the nuclear and chloroplast photorelocation movements share common photoreceptor systems.

Keywords: Adiantum capillus-veneris - chloroplast movement - fern - neochrome - nuclear movement - phototropin


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