In 1968 Walter R. Fehr, Department of Agronomy, Iowa State University, observed sterile plants in a single plant progeny row of the cultivar 'Hark'. Further analyses by Fehr indicated that sterility existed in both sexes and that it was a recessive genetic trait (Fehr, personal communication, 1970). The current research effort began in 1970.
Palmer, Reid G.; Heer, Hollys E.; Lackey, J.; Isely, D.; and Sheridan, Monica
"Research Notes: Iowa State University and United States Department of Agriculture,"
Soybean Genetics Newsletter: Vol. 1
, Article 7.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol1/iss1/7