Control by Ammonium Ion of the Change from Step-Up to Step-Down Photophobically Responding Cells in the Flagellate Alga Euglena gracilis
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概要
- 論文の詳細を見る
The regulation between step-down and step-up photophobic responses, resulting in photoaccumulation of the cells in an actinic light trap or cells' avoidance from an excessive illumination, is crucially important for the survival of phototrophic organisms such as Euglena gracilis. As for the factors involved in this regulation in Euglena gracilis, we for the first time report here that ammonium ion specifically enhances step-down photophobic response, together with the effects of _L-methionine-_<DL>-sulfoximine (_L-MSO), an inhibitor of ammonium assimilation, to specifically enhance step-up photophobic response. The apparent positive correlation between the degree of greening and the step-down photophobic response did not seem to reflect real causal relationship in view of the results with effects of gabaculine, an inhibitor of δ-aminolaevulinic acid (δ-ALA) formation. The transmission of stigma and step-down appearance did not show any correlation either, in contrast to a previous assumption by other authors. Cycloheximide (CHX), an inhibitor of eukaryotic protein synthesis, suppressed step-down appearance and enhanced step-up appearance, probably suggesting an involvement of some (newly synthesized) protein(s) specifically in the step-down photosignal detection and/or signal transduction process(es).
- 日本植物生理学会の論文
著者
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WATANABE Masakatsu
National Institute of Basic Biology (NIBB)
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渡辺 正勝
岡崎国立共同研究機構基礎生物学研究所
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Matsunaga Shigeru
Institute of Biological Sciences, university of Tsukuba
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Takahashi Tetsuo
Japan Advanced Institute of Science and Technology
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Sugai Michizo
Department of Biology, Faculty of Science, Toyama University
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Hori Terumitsu
Institute of Biological Sciences, University of Tsukuba
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Sugai Michizo
Departmen T Of Biology Faculty Of Science Toyama University
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Hori Terumitsu
Institute Of Biological Sciences University Of Tsukuba
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Watanabe Masakatsu
Nibb
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Watanabe Masakatsu
Large Spectrograph Laboratory National Institute For Basic Biology
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Watanabe Masakatsu
National Institute For Basic Biology
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Takahashi Teruo
Department Of Organic And Polymeric Materials Tokyo Institute Of Technology
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Takahashi Tetsuo
National Institute Of Advanced Industrial Science And Technology Power Electronics Research Center
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Taguchi Tomohiro
Department Of Organic Materials Tokyo Institute Of Technology
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Matsunaga Shigeru
Institute Of Biological Sciences University Of Tsukuba
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Takahashi Toshiaki
Department Of Environment And Mutation Research Institute For Radiation Biology And Medicine Hiroshi
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Takahashi T
Japan Advanced Institute Of Science And Technology
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Takahashi T
Second Department Of Internal Medicine Hiroshima University School Of Medicine
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Takahashi T
Department Of Pediatrics Akita University Graduate School Of Medicine
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Takahashi Tsutomu
Department Of Energy Sciences The Graduate School At Nagatsuta Tokyo Institute Of Technology
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