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Published in Crop Sci 16:49-52 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Physical and Chemical Mutagens on Survival, Growth, and Seed Yield of Soybeans1

M. J. Constantin, W. D. Klobe and L. N. Skold2

To acquire dose-response data, seeds of ‘D68-127’ soybeans (Glycine max L. Merr., a sib-line of the recently released ‘Forrest’ cultivar) were treated with fission neutrons, gamma radiation, ethylmethane sulfonate, and diethyl sulfate. Treated and nontreated populations were grown in the greenhouse and in the field. In greenhousegrown populations, survival was unaffected by the neutron doses and by gamma radiation doses less than 70 krads but decreased with an increase in dose of chemical mutagens. Seedling height and shoot dry weight decreased as the dose of each mutagen increased. In fieldgrown populations, survival, height, and seed yield decreased as the dose of each mutagen increased. Seed treatments that reduced seedling height to ≤ 10% of control in the greenhouse also reduced seed yield to ≥ 10% of control. Based on seed yield of M1 plants, recommended seed treatments are 1.5 to 2.5 krads fission neutrons, 20 to 30 krads gamma radiation, 8-hour soaking in 0.025 to 0.050 M ethylmethane sulfonate, and 90 to 150-min soaking in 0.15% by volume diethyl sulfate.

Key Words: Glycine max (L.) Merr. • Mutagenesis • Gamma radiation • Fission neutrons • Ethyhnethane sulfonate • Diethyl sulfate

1 Research sponsored by the U. S. Energy Research and Development Administration under contract no. AT-40-1-GEN-242 with the Univ. of Tennessee and by the Tenn. Agric. Exp. Stn. Hatch Project TEN 00360.

2 Professor, Comparative Animal Research Laboratory, 1299 Bethel Valley Road, Oak Ridge, TN 37830; assistant professor, Dep. of Agricultural Biology; and professor, Dep. of Plant and Soil Sience, Univ. of Tennessee, Knoxville, TN 37916, respectively.

Received for publication April 7, 1975.




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