GSOR 2, also known as OR 1783, is a dominant genetic male sterile mutant, induced by gamma radiation of the cultivar Orion. It is maintained by bulking Msms sterile plants, which have as much as 27.4% seed set under open pollination. The bulk seed will produce plants that segregate 1 male sterile:1 fertile. Except for sterility, GSOR 2 is phenotypically identical to its parent, Orion.