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Plant Physiology 68:983-984 (1981)
© 1981 American Society of Plant Biologists

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Short Communications

Dinitrogen Fixation by Cultures of Frankia sp CpIl Demonstrated by 15N2 Incorporation 1

John G. Torrey, John D. Tjepkema, Graham L. Turner, Fraser J. Bergersen and Alan H. Gibson

Cabot Foundation, Harvard University, Petersham, Massachusetts 01366, Division of Plant Industry, Commonwealth Scientific and Industrial Research Organization, Canberra City, A. C. T. 2601, Australia

The filamentous bacterium Frankia of the Actinomycetales, isolated from the nitrogen-fixing root nodules of certain woody plants, has shown nitrogenase activity in culture, using the acetylene reduction method. In the present work, nitrogenase activity in pure cultures of Frankia sp. CpIl is confirmed using mass spectrometric measurements of 15N2 incorporation. After addition of carrier NH4+ to digested cultures, those exposed to 15N2 (25 atom%) had a 15N content of 3.16 atom% compared to 0.354 atom% 15N in the controls.

1 Supported in part by the Maria Moors Cabot Foundation for Botanical Research of Harvard University, Research Grant DEB 77-02249 of the National Science Foundation, and United States Department of Agriculture Research Grant 5901-0410-8-0055-0.






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Copyright © 1981 by the American Society of Plant Biologists