Effects of co2 concentration in rhizosphere on nodulation and n2 fixation of soybean and cowpea

Takeo Yamakawa, Takuo Ikeda, Junji Ishizuka, Junji Ishizuka

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Soybean (Glycine max L. Merr.) cvs. Akisengoku and Peking, and cowpea (Vigna unguiculata Walp.) cv. Kegonnotaki were inoculated with Bradyrhizobium japonicum AlO17, Shinorhizobium fredii USDAI93, and B. sp. Vigna MAFF03-03063, respectively and were cultured hydroponically with supply of CO2-free air, 3dm3 m-3 CO2 air, or 25 dm3 m-3 CO2 air to study the effects of the CO2 concentration in the rhizosphere on plant growth, nodulation, and nitrogen fixation. Increase of the CO2 concentration in the rhizosphere led to the increase of the plant dry weight in the symbiosis between Peking and USDAI93, and that between Kegonnotaki and MAFF03-03063. On the other hand, dry matter accumulation in the symbiosis between Akisengoku and AI017 decreased under the supply of 25 dm3 m-3 CO2 air aimed at increasing the CO2 concentration in the rhizosphere beyond the optimum CO2 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 CO2 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 CO2-free air, and it increased with the increase of the CO2 concentration in the rhizosphere. For the symbiosis of Bradyrhizobium strains with soybean and cowpea, the most suitable CO2 concentration for N2 fixation and plant growth was estimated to be about 10 dm3 m-3, while for the symbiosis of S. fredii with soybean, the value was estimated to be above 30 dm3 m-3.

Original languageEnglish
Pages (from-to)713-720
Number of pages8
JournalSoil Science and Plant Nutrition
Volume50
Issue number5
DOIs
Publication statusPublished - Feb 1 2004

Fingerprint

nodulation
cowpeas
fixation
soybean
rhizosphere
symbiosis
carbon dioxide
soybeans
air
dry matter
nitrogen fixation
dry matter accumulation
effect
plant growth
Vigna
Bradyrhizobium
Bradyrhizobium japonicum
Vigna unguiculata
biological nitrogen fixation
Glycine max

All Science Journal Classification (ASJC) codes

  • Soil Science
  • Plant Science

Cite this

Effects of co2 concentration in rhizosphere on nodulation and n2 fixation of soybean and cowpea. / Yamakawa, Takeo; Ikeda, Takuo; Ishizuka, Junji; Ishizuka, Junji.

In: Soil Science and Plant Nutrition, Vol. 50, No. 5, 01.02.2004, p. 713-720.

Research output: Contribution to journalArticle

Yamakawa, Takeo ; Ikeda, Takuo ; Ishizuka, Junji ; Ishizuka, Junji. / Effects of co2 concentration in rhizosphere on nodulation and n2 fixation of soybean and cowpea. In: Soil Science and Plant Nutrition. 2004 ; Vol. 50, No. 5. pp. 713-720.
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AU - Ishizuka, Junji

AU - Ishizuka, Junji

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N2 - Soybean (Glycine max L. Merr.) cvs. Akisengoku and Peking, and cowpea (Vigna unguiculata Walp.) cv. Kegonnotaki were inoculated with Bradyrhizobium japonicum AlO17, Shinorhizobium fredii USDAI93, and B. sp. Vigna MAFF03-03063, respectively and were cultured hydroponically with supply of CO2-free air, 3dm3 m-3 CO2 air, or 25 dm3 m-3 CO2 air to study the effects of the CO2 concentration in the rhizosphere on plant growth, nodulation, and nitrogen fixation. Increase of the CO2 concentration in the rhizosphere led to the increase of the plant dry weight in the symbiosis between Peking and USDAI93, and that between Kegonnotaki and MAFF03-03063. On the other hand, dry matter accumulation in the symbiosis between Akisengoku and AI017 decreased under the supply of 25 dm3 m-3 CO2 air aimed at increasing the CO2 concentration in the rhizosphere beyond the optimum CO2 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 CO2 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 CO2-free air, and it increased with the increase of the CO2 concentration in the rhizosphere. For the symbiosis of Bradyrhizobium strains with soybean and cowpea, the most suitable CO2 concentration for N2 fixation and plant growth was estimated to be about 10 dm3 m-3, while for the symbiosis of S. fredii with soybean, the value was estimated to be above 30 dm3 m-3.

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