Effects of CO_2 Concentration in Rhizosphere on Nodulation and N_2 Fixation of Soybean and Cowpea(Plant Nutrition)
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概要
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Soybean (Glycine max L. Merr.) cvs. Akisengoku and Peking, and cowpea (Vigna unguiculata Walp.) cv. Kegonnotaki were inoculated with Bradyrhizobium japonicum A1017, Shinorhizobium fredii USDA193, and B. sp. Vigna MAFF03-03063, respectively and were cultured hydroponically with supply of CO_2-free air, 3 dm^3 m^<-3> CO_2 air, or 25 dm^3 m^<-3> CO_2 air to study the effects of the CO_2 concentration in the rhizosphere on plant growth, nodulation, and nitrogen fixation. Increase of the CO_2 concentration in the rhizosphere led to the increase of the plant dry weight in the symbiosis between Peking and USDA193, and that between Kegonnotaki and MAFF03-03063. On the other hand, dry matter accumulation in the symbiosis between Akisengoku and A1017 decreased under the supply of 25 dm^3 m^<-3> CO_2 air aimed at increasing the CO_2 concentration in the rhizosphere beyond the optimum CO_2 concentration for growth. Nodule mass and nodule number per plant were highest in Akisengoku, followed by Kegonnotaki and lowest in Peking. Also the increase of the CO_2 concentration in the rhizosphere led to the increase of the nodule mass and number in Kegonnotaki, while no changes were observed in Akisengoku and Peking. Biological nitrogen fixation (BNF) was highest in Akisengoku, followed by Kegonnotaki, and lowest or near zero in Peking. BNF in Akisengoku and Kegonnotaki showed a similar tendency to that of dry matter accumulation. BNF of Peking was especially low under the supply of CO_2-free air, and it increased with the increase of the CO_2 concentration in the rhizosphere. For the symbiosis of Bradyrhizobium strains with soybean and cowpea, the most suitable CO_2 concentration for N_2 fixation and plant growth was estimated to be about 10 dm^3 m^<-3>, while for the symbiosis of S. fredii with soybean, the value was estimated to be above 30 dm^3 m^<-3>.
- 社団法人日本土壌肥料学会の論文
著者
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YAMAKAWA TAKEO
Laboratory of Plant Nutrition, Division of Soil Science and Plant production, Department of Plant Re
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Yamakawa Takeo
Department Of Agricultural Chemistry Kyushu University
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Ishizuka Junji
Laboratory of Plant Nutrition, Division of Bioresource and Bioenvironmental Science, Graduate School
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Yamakawa T
Kyushu Univ. Fukuoka Jpn
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Yamakawa Takeo
Laboratory Of Plant Nutrition Division Of Soil Science And Plant Production Department Of Plant Reso
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Ikeda Takuo
Laboratory of Plant Nutrition, Division of Bioresource and Bioenvironmental Sciences, Graduate Schoo
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Ikeda Takuo
Laboratory Of Plant Nutrition Division Of Bioresource And Bioenvironmental Sciences Graduate School
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Ishizuka J
Kyushu Univ. Fukuoka Jpn
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Ishizuka Junji
Laboratory Of Plant Nutrition Division Of Bioresource And Bioenvironmental Science Graduate School K
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Yamakawa Takeo
Laboratory Of Plant Nutrition Division Of Bioresource And Bioenvironmental Science Graduate School K
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