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Published online 1 September 1956
Published in Agron J 48:401-406 (1956)
© 1956 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Thermal Neutrons on Dormant Seeds of Sorghum vulgare Per.1

Karl Kaukis and O. J. Webster2

Synopsis: Studies on sorghum seed irradiated with X-rays and thermal neutrons produced the following general results: The height of seedlings from irradiated seed was reduced with increases in dosage. Plants grown from irradiated seed exhibited depressed stature. All radiation dosages delayed the anthesis and shortened the blooming period. The average sterility ranged from 12.5 to 75.8% in the lowest and the highest radiation doses, respectively. The corresponding averages of number of bridges per cell were 0.2 and 1.53 and frequencies of seedling mutants 2.7 and 7.3%. Estimates for biological equivalence of thermal neutrons to 1 r of X radiation were obtained.

1 Contribution from Agronomy Department, Nebraska Agr. Exp. Sta., and Field Crops Research Branch, A.R.S., U.S.D.A. Part of this paper is from a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree at the University of Nebraska. Published with the approval of the Director as Paper No. 755. Journal Series, Nebraska Agr. Exp. Sta.

2 Formerly Assistant in Agronomy, Nebraska Agr. Exp. Sta., and Agronomist, F.C.R.B., A.R.S., U.S.D.A., respectively.

Received for publication April 26, 1956.




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Copyright © 1956 by the American Society of Agronomy.