Mutations for partial sterility were identified in an experiment designed to recover new mutations in the Asgrow Mutable line as evidence for transposition of a mobile genetic element (Groose and Palmer, 1987). The mutations were discovered in a field nursery that included 1697 F11 progeny rows of the Asgrow Mutable line. Mutant plants with reduced numbers of seeds per pod were first detected when the nursery was examined at maturity.