Vacuolar Proton Pumps and Aquaporins Involved in Rapid Internode Elongation of Deepwater Rice
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概要
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Rapid growth of the submerged shoots of deepwater rice is essential for survival during the rainy season. We investigated changes in the expression of vacuolar H+-ATPase (V-ATPase), H+-pyrophosphatase (V-PPase), and aquaporins under submerged conditions. The amounts of vacuolar proton pumps, which support the active transport of ions into the vacuoles, were maintained on a membrane protein basis in the developing vacuoles. Among the six isogenes of V-PPase, OsVHP1;3 was markedly enhanced by submersion. The gene expression of efficient water channels, OsTIP1;1, OsTIP2;2, OsPIP1;1, OsPIP2;1, and OsPIP2;2, was markedly enhanced by submersion. The increase in aquaporin expression might support quick elongation of internodes. The mRNA levels of OsNIP2;2 and OsNIP3;1, which transport silicic and boric acids respectively, clearly decreased. The present study indicates that internodes of deepwater rice upregulate vacuolar proton pumps and water channel aquaporins and downregulate aquaporins that allow permeation of the substrates that suppress internode growth.
著者
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ASHIKARI Motoyuki
Bioscience and Biotechnology Center, Nagoya University
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Hattori Yoko
Bioscience and Biotechnology Center, Nagoya University
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MUTO Yukari
Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University
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SEGAMI Shoji
Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University
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HAYASHI Hidehiro
Climate Change Research Team, National Agricultural Research Center for The Tohoku Region
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SAKURAI Junko
Climate Change Research Team, National Agricultural Research Center for The Tohoku Region
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MURAI-HATANO Mari
Climate Change Research Team, National Agricultural Research Center for The Tohoku Region
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MAESHIMA Masayoshi
Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University
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