Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 20:427-430 (1980)
© 1980 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Alfalfa Ploidy on Nitrogen Fixation1

Walter T. Leps, Winston J. Brill and E. T. Bingham2

Genetically similar families of alfalfa (Medicago sativa L.) at diploid (2x), tetraploid (4x), and octaploid (8x) ploidy levels were assayed for acetylene-reduction activity to determine the effect of ploidy on N2 fixation by nodulated plants. Tetraploids had higher rates of acetylene reduction than diploids during the first 10 days of growth. After that time, both tetraploid and diploid plants reduced acetylene at the same rate. The higher acetylenereduction activity found during the first 10 days may reflect the ability of the tetraploids to fix more N2 than the diploids early in growth and may explain why tetraploids had higher N contents than the diploids when the plants obtained their N from N2 fixation. Increasing the ploidy of alfalfa plants from tetraploid to octaploid did not result in increased acetylene-reduction activities or N content.

Key Words: N fixation • Ploidy • Medicago sativa L. • Rhizobium meliloti

1 Research supported by the College of Agricultural and Life Sciences, Univ. of Wisconsin, and NSF Grant No. PFR-7700879. Contribution from the Dep. of Bacteriology and of Agronomy, Univ. of Wisconsin, Madison, WI 53706.

2 Research associate, professor of bacteriology, and professor of agronomy, respectively.

Received for publication October 2, 1979.


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