Change in Nitrate Reducing Activity in Squash Seedlings with NO_2 Fumigation
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概要
- 論文の詳細を見る
Nitrogen dioxide (NO_2) fumigation inhibited nitrate reductase (NR, EC 1.6.6.1) activity assayed by an in vivo system in the cotyledons, but not in the first leaves, of squash (Cucurbita maxima Duch.) seedlings. The inhibition was recovered when the seedlings were transferred to NO_2-free conditions, indicating that the effect of NO_2 was reversible. The NADH content in the cotyledons, photosynthetic O_2 evolution and respiratory O_2 uptake did not change notably under NO_2 fumigation. Nitrate contents in the cotyledons and first leaves did not change with NO_2 fumigation, but nitrite, ammonium and rapidly-metabolized amino acids contents increased. The inhibitory effect of NO_2 was also observed in the in vitro assay, though the inhibition rate was smaller than that in the in vivo assay. These results indicate that the inhibitory effect of NO_2 on NR activity in squash cotyledons was derived in part from the decrease in the amount of active NR due to ammonium and/or amino acids accumulated in the tissue under NO_2 fumigation.
- 日本植物生理学会の論文
著者
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Takeuchi Yuichi
Department Of Bioscience And Technology School Of Engineering Hokkaido Tokai University:course Of En
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Takeuchi Yuichi
Division Of Environmental Biology The National Institute For Environmental Studies
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Kondo Noriaki
Division Of Environmental Biology The National Institute For Environmental Studies
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Kondo Noriaki
Graduate School Of Science University Of Tokyo
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Kondo Noriaki
Department Of Biology Faculty Of Science University Of Tokyo
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Kondo N
Department Of Biological Siences Graduate School Of Sience The University Of Tokyo
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Kondo Noriaki
Division Of Biosciences Graduate School Of Sciences And Engineering Teikyo University Of Science And
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Takeuchi Y
Hokkaido Tokai Univ. Sapporo Jpn
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Tezuka Takafumi
Laboratory of Horticultural Science, Faculty of Agriculture, Nagoya University
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Nihira Junko
The Graduate School of Environmental Science, The University of Tsukuba
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Tezuka Takafumi
Laboratory Of Horticultural Science Faculty Of Agriculture Nagoya University
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Nihira Junko
The Graduate School Of Environmental Science The University Of Tsukuba:(present)faculty Of Home Econ
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