Stimulation of H^+ Extrusion and Plasma Membrane H^+-ATPase Activity of Barley Roots by Ammonium-Treatment
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概要
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H^+ extrusion and the plasma membrane H^+-ATPase activity were analyzed using barley roots exposed to ammonium. H^+ extrusion from roots was enhanced 4 h after the addition of 5 mol m^<-3> ammonium to the medium. However, the stimulation of the plasma membrane H^+-ATPase activity occurred at least 8 h after the addition of ammonium. Furthermore, this stimulation was found to be caused by the increase in the content of H^+-ATPase proteins based on the results of immunoassay. These results indicate that H^+ was actively extruded to the medium through the increase in the amount of plasma membrane H^+-ATPase proteins, when barley roots were exposed to ammonium for more than 8 h. Thus, it is assumed that in the long term exposure to ammonium nitrogen, ammonium-induced stimulation of the H^+-ATPase activity may be important to maintain intracellular pH in root cells under the acidic conditions associated with the uptake of ammonium.
- 社団法人日本土壌肥料学会の論文
著者
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Yamamoto Yoko
Research Institute for Bioresources, Okayama University
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Yamamoto Yoko
Research Institute For Bioresources Okayama University
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MATSUMOTO Hideaki
Research Institute for Bioresources, Okayama University
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Kasai M
Department Of Botany Faculty Of Science Hirosaki University
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Kasai Minobu
Dept. Biofunc. Sci. Fac. Agr. Life Sci. Horisaki Univ.
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Matsumoto Hideaki
Res. Inst. Bioresources Okayama Univ.
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Matsumoto Hideaki
Research Institute For Bioresources Okayama University
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Sasaki Masao
Research Institute For Bioresources Okayama University
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Sasakawa Hideo
The Graduate School Of Natural Science And Technology Okayama University:(present Address)faculty Of
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Sasakawa Hideo
The Graduate School Of Natural Science And Technology Okayama University
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Shibasaka M
Research Institute For Bioresources Okayama University
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SHIBASAKA Mineo
Research Institute for Bioresources, Okayama University
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KASAI Minobu
Research Institute for Bioresources, Okayama University
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Shibasaka Mineo
Research Institute For Bioresources Okayama University
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Yamamoto Y
Faculty Of Agriculture Kochi University
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Yamashita Kousei
Research Institute for Bioresources, Okayama University
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Ezaki Bunich
Research Institute for Bioresources, Okayama University
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Yamamoto Yoshinori
Kochi Univ. Kochi Jpn
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Ezaki Bunich
Research Institute For Bioresources Okayama University
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Yamashita Kousei
Research Institute For Bioresources Okayama University
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Matsumoto Hideaki
Res. Inst. For Bioresources Okayama Univ.
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Kasai Minobu
Research Institute For Bioresources Okayama University:(present Address)department Of Biology Facult
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