One of the M4 progenies of PK-71-39 soybean irradiated with 10 Kr gamma rays showed segregation for sterility in soybean in 1976. It had 18 sterile plants and 4 normal plants, indicating that a single dominant gene was responsible for sterility. The sterile plants had no seeds and, therefore, this appeared to be a dead end for this mutant.
Singh, B. B.; Singh, Kamendra; and Puspendra
"Research notes: Induced cytoplasmic sterility in soybeans,"
Soybean Genetics Newsletter: Vol. 6
, Article 19.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol6/iss1/19