Plant and Cell Physiology Advance Access published online on December 11, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci237
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1 Department of Biosystems Science, School of Advanced Sciences, The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 204-0193, Japan
* To whom correspondence should be addressed. 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.
Received October 31, 2005
Accepted November 29, 2005
Regular Paper
Gravitropism in Leaves of Arabidopsis thaliana (L.) Heynh
Eriko Mano 1,
Gorou Horiguchi 2,
and
Hirokazu Tsukaya 3 *
2 Department of Basic Biology, School of Life Science, The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 204-0193, Japan; National Institute for Basic Biology / Okazaki Institute for Integrative Bioscience, 38 Nisigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
3 Department of Biosystems Science, School of Advanced Sciences, The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 204-0193, Japan; Department of Basic Biology, School of Life Science, The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 204-0193, Japan; National Institute for Basic Biology / Okazaki Institute for Integrative Bioscience, 38 Nisigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan; Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan; Present address: Graduate School of Science, University of Tokyo, Science Build #2, 7-3-1 Hongo, Tokyo 113-0033 Japan
Hirokazu Tsukaya, E-mail: tsukaya{at}nibb.ac.jp
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