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Nitrogen Fixation by Bacteria in the Root Zone of Rice

1971; Wiley; Volume: 35; Issue: 1 Linguagem: Inglês

10.2136/sssaj1971.03615995003500010047x

1435-0661

T. Yoshida, Rosabel R. Ancajas,

Agriculture, Soil, Plant Science

Atmospheric nitrogen is fixed in the root zone of rice plants (Oryza sativa L.). Acetylene-ethylene assay showed that bacteria, rather than the root tissues, do the fixation. Although the root tissues produce a trace of ethylene, they cannot reduce acetylene to ethylene. The apparent Km (Michaelis constant) of acetylene was much higher than values from known nitrogenfixing bacteria.