The effect of nitrogen addition on N_2-fixation and on glutamate dehydrogenase and glutamate synthase activities in nodules and roots of soybeans inoculated with various strains of Rhizobium japonicum
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概要
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The addition of nitrogen in the form of urea decreased the activities of glutamate dehydrogenase (GDH) and glutamate synthase (GOGAT) in root nodules of Glycine max, whereas the same addition greatly enhanced root GDH activity. Division of nodules into a mitochondrial and bacteroid fraction indicated that the addition of nitrogen as urea, ammonia, or nitrate most greatly inhibits GDH activity in the mitochondrial fraction. Studies with plants having floral primordia indicated that added nitrate inhibits nodular GDH more than either ammonia or urea, while plants inoculated with an ineffective strain (non-nitrogen fixing) of Rhizobium japonicum showed an increase in nodular GDH activity with nitrogen addition. GOGAT activity was greatly reduced after floral initiation. GDH, GOGAT, and nitrogenase activities in root nodules appeared to vary with the strain of Rhizobium japonicum used as inoculum. In general, strains which produced nodules with high GDH activity produced bacteroids with low GOGAT activity and the strain which produced nodules with the lowest GDH activity produced bacteroids with the highest GOGAT activity.
- 日本植物生理学会の論文
著者
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Duke Stanley
Departmcnt Of Agronomy University Of Wisconsin
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Duke Stanley
Department Of Botany University Of Minnesota
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Ham George
Department of Soil Science, University of Minnesota
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Ham George
Department Of Soil Science University Of Minnesota
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