The production of hybrid soybean will require the discovery of F1 heterosis of a magnitude that provides growers the incentive to purchase hybrid seed. The primary barrier to the testing of F1 heterosis is the acquisition of adequate quantities of F1 seed (Nelson and Bernard, 1984). Presently, the most efficient means of obtaining experimental quantities of hybrid seed is through the use of nuclear (genie) male-sterile mutations.
Graybosch, Robert; Edge, Mark; and Delannay, Xavier
"Research Notes : United States : Seed production by male-sterile soybeans in Missouri,"
Soybean Genetics Newsletter: Vol. 14
, Article 35.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol14/iss1/35