Journal Article

Phototropin-Dependent Weak and Strong Light Responses in the Determination of Branch Position in the Moss <i>Physcomitrella patens</i>

Hidetoshi Uenaka and Akeo Kadota

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 49, issue 12, pages 1907-1910
Published in print December 2008 | ISSN: 0032-0781
Published online December 2008 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pcn158
Phototropin-Dependent Weak and Strong Light Responses in the Determination of Branch Position in the Moss Physcomitrella patens

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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

Journal Article.  1867 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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