Salt Stress Increases the Respiratory Cost of Nitrogen Fixation
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概要
- 論文の詳細を見る
The effects of NaCl stress (0, 3,000, 6,000 ppm) on the nitrogen fixation, respiration, and respiratory cost of nitrogen fixation of detached alfalfa nodules were investigated. Acetylene reduction activity and respiration of the nodules decreased to 96 and 84% of the control at 3,000 ppm NaCl, and to 48 and 68% at 6,000 ppm, respectively. The respiratory cost of nitrogen fixation (R_f) and the maintenance and growth respiration (R_<mg>) were estimated using the linear regression of the nodule respiration on the acetylene reduction under 10 and 20% p_<O_2> conditions. In the alfalfa nodules, the R_f and R_<mg> values were 2.23 and 24.01 μmol CO_2/(g(f.w.)・h) in the control, respectively. NaCl stress at 6,000 ppm increased the R_f value and decreased the R_<mg> value significantly, though no significant effect was observed at 3,000 ppm NaCl. It is assumed that the increase of the R_f value was due to the overflow of energy by unbalance between energy supply of nitrogen fixation respiration and energy consumption by nitrogenase system due to the more pronounced suppression of the nitrogenase activity than of the nitrogen fixation respiration.
- 社団法人日本土壌肥料学会の論文
著者
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Ikeda Jun-ichi
Faculty Of Agriculture Kyoto University
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KOBAYASHI Michiharu
Faculty of Agriculture, Kyoto University
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TAKAHASHI Eiichi
Faculty of Agriculture, Kyoto University
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Kobayashi Michiharu
Faculty Of Agriculture Kyoto University
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Kobayashi Michiharu
Faculty Of Agriculture Department Of Agricultural Chemistry Kyoto University
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Takahashi Eiichi
Faculty Of Agriculture Department Of Agricultural Chemistry Kyoto University
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