NO_2 Suppression of Light-Induced Nitrate Reductase in SquaSh Cotyledons

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概要

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• NADH-nitrate reductase (NR) (EC 1.6.6.1) activity in the cotyledons of squash (Cucurbita maxima Duch.) seedlings showed daily variation when the seedlings were subjected to an alternating light-dark cycle. When the seedlings were transferred into continuous darkness, NR activity rose at first and then decreased continuously. Irradiation after continuous darkness induced a rapid increase in NR activity; this light induction of NR activity was inhibited completely by fumigation with 4 ppm nitrogen dioxide (NO_2). This inhibitory effect of NO_2 was prominent even at 1 ppm and became more pronounced as the concentration of NO_2 increased. NO_2 fumigation did not remarkably affect the content of reductant (NADH) in the cotyledons. The results of immunoblotting using anti-NR serum indicated that irradiation induced the increase in the NR-polypeptide content and NO_2 fumigation inhibited the increase, suggesting that NO_2 put an inhibitory effect on the synthesis of NR induced by irradiation.

• 日本植物生理学会の論文

著者

• SATOH Shinobu

  Institute of Biological Sciences, University of Tsukuba

• Takeuchi Yuichi

  Department Of Bioscience And Technology School Of Engineering Hokkaido Tokai University:course Of En

• Takeuchi Yuichi

  Division Of Environmental Biology The National Institute For Environmental Studies

• Kondo Noriaki

  Division Of Environmental Biology The National Institute For Environmental Studies

• Kondo Noriaki

  Graduate School Of Science University Of Tokyo

• Kondo Noriaki

  Department Of Biology Faculty Of Science University Of Tokyo

• Satoh Shinobu

  Institute Of Biological Sciences University Of Tsukuba

• Kondo N

  Department Of Biological Siences Graduate School Of Sience The University Of Tokyo

• Kondo Noriaki

  Division Of Biosciences Graduate School Of Sciences And Engineering Teikyo University Of Science And

• Takeuchi Y

  Hokkaido Tokai Univ. Sapporo Jpn

• Hisamatsu Shin

  The Graduate School Of Environmental Science The University Of Tsukuba:(present )college Of Environm

• Nihira Junko

  The Graduate School of Environmental Science, The University of Tsukuba

• Nihira Junko

  The Graduate School Of Environmental Science The University Of Tsukuba:(present)faculty Of Home Econ

• Satoh Shinobu

  Institute Of Biological Sciences The University Of Tsukuba

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