Effects of in Vivo Treatment with Abscisic Acid and/or Cytokinin on Activities of Vacuoler H^+ Pumps of Tonoplast-Enriched Membrane Vesicles Prepared from Barley Roots
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概要
- 論文の詳細を見る
We investigated the effects of in vivo treatment (1 day) of barley roots with abscisic acid (ABA) and/or a cyiokinin (6-benzyladenine; BA) on the ATP- and PP_i-dependent H^+ transport activities of tonoplast-enriched membrane vesicles prepared from the roots. Treatment with ABA significantly increased the two H^+ transport activities. By contrast, treatment with BA significantly decreased PP_i-dependent H^+ transport activity, while the change in ATP-dependent H^+ transport activity was small. Increases in the two H^+ transport activities caused by treatment with ABA were suppressed during treatment with ABA and BA. Changes in the NO_3^--inhibitable ATP-ase activity and the Na^+_inhibitable PP_iase activity of membrane vesicles after treatment of roots with phyiohormone(s) (ABA. BA, ABA + BA) were similar to changes in the ATP- and PP_i-dependent H^+ transport activities of the membrane vesicles, respectively. Immunoblot analysis with antibodies raised against the functional catalytic subunits of the vacuolar H^+ pumps (H+_ ATPase and H^+_PP_iase) of mung bean revealed that only the level of the functional catalytic sub-unit of the H^+_PP_iase of the membrane vesicles was significantly increased by treatment with ABA alone and in combination with BA. These results suggest that treatment with ABA has a stimulatory effect on the activities of the two H^+ pumps of the vacuolar membrane of barley roots, with increase in the level of the catalytic subunit of the H^+_PP_iase, and that treatment with BA has an inhibitory effect on the two H^+ pump activities of the vacuolar membrane without changes in the levels of the catalytic subunits of either H^+ pump, with the limitation that treatment with BA has an inhibitory effect only when the activity of the H^+_ATPase has been increased by treatment with ABA.
- 日本植物生理学会の論文
著者
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Yamamoto Yoko
Research Institute for Bioresources, Okayama University
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Maeshima Masayoshi
Graduate School of Bioagricultural Sciences, Nagoya 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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Maeshima Masayoshi
Laboratory Of Biochemistry School Of Agriculture Nagoya University:(present)institute Of Low Tempera
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Maeshima Masayoshi
School Agriculture Nagoya Univ.
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Maeshima Masayoshi
Department Of Agricultural Chemistry Nagoya University
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Maeshima Masayoshi
Laboratory Of Biochemistry Graduate School Of Bioagricultural Sciences Nagoya University
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Maeshima M
Laboratory Of Cell Dynamics Graduate School Of Bioagricultural Sciences Nagoya University
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KASAI Minobu
Research Institute for Bioresources, Okayama University
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MAESHIMA Masayoshi
Institute of Low Temperature Science, Hokkaido University
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Matsumoto Hideaki
Res. Inst. For Bioresources Okayama Univ.
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Maeshima Masayoshi
Institute Of Low Temperature Science Hokkaido University
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Kasai Minobu
Research Institute For Bioresources Okayama University:(present Address)department Of Biology Facult
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