Plant and Cell Physiology Advance Access originally published online on December 11, 2005
Plant and Cell Physiology 2006 47(2):217-223; doi:10.1093/pcp/pci237
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Gravitropism in Leaves of Arabidopsis thaliana (L.) Heynh.
1 Department of Biosystems Science, School of Advanced Sciences, The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa, 204-0193 Japan
2 Department of Basic Biology, School of Life Science, The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa, 204-0193 Japan
3 National Institute for Basic Biology/Okazaki Institute for Integrative Bioscience, 38 Nisigonaka, Myodaiji, Okazaki, Aichi, 444-8585 Japan
4 Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan
* Corresponding author: E-mail, tsukaya{at}nibb.ac.jp; Fax, +81-564-55-7512.
In higher plants, stems and roots show negative and positive gravitropism, respectively. However, current knowledge on the graviresponse of leaves is lacking. In this study, we analyzed the positioning and movement of rosette leaves of Arabidopsis thaliana under light and dark conditions. We found that the radial positioning of rosette leaves was not affected by the direction of gravity under continuous white light. In contrast, when plants were shifted to darkness, the leaves moved upwards, suggesting negative gravitropism. Analysis of the phosphoglucomutase and shoot gravitropism 2–1 mutants revealed that the sedimenting amyloplasts in the leaf petiole are important for gravity perception, as is the case in stems and roots. In addition, our detailed physiological analyses revealed a unique feature of leaf movement after the shift to darkness, i.e. movement could be divided into negative gravitropism and nastic movement. The orientation of rosette leaves is ascribed to a combination of these movements.
5 Present address: Graduate School of Science, University of Tokyo Science Building #2, 7-3-1 Hongo, Tokyo 113-0033 Japan.
(Received October 31, 2005; Accepted November 29, 2005)
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