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Dinitrogen Fixation of Rice-Klebsiella Associations¹

We report N₂ fixation by Klebsiella oxytoca strain NG13, isolated from the rhizosphere of a rice (Oryza sativa L.) plant, in association with Indica type rice strain, C5444. The C₂H₂-reducation assays, biomass measurements, N content determinations, and ¹⁵N isotopic dilution assays indicated that inoculation of C5444 with NG13 resulted in a 6% increase of total plant+soil N content, and a 19% ¹⁵N isotopic dilution of plant N after 120 days of cultivation. Our results demonstrated significant levels of N₂ fixation by K. oxytoca when associated with rice. By optimizing such rice plant-bacterial N₂ fixation capacity, the N uptake by rice could be enhance.

Key Words: Oryza sativa L. • ¹⁵N dilution assay • Klebsiella oxytoca • Associative dinitrogen fixation

² Research fellow, associate professor, and research scientist, respectively, Natl. Inst. of Genetics, Mishima, 411 Japan; professor, Intitute of Microbiology, Univ. of Tokyo, Tokyo, 113 Japan, senior researcher, Natl. Inst. of Agrobiological Resources, Tsukuba, 305 Japan, and associate professor and professor, respectively, Natl. Inst. of Genetics, Mishima, 411 Japan.

Received for publication March 4, 1985.