SEX REVERSAL IN MAIZE X TRIPSACUM HYBRIDS - ALLELIC NON-COMPLEMENTATION OF TS2 AND GSF1

An intergeneric hybrid, generated by crossing a diploid maize tassel s eed (ts2) stock by a diploid Tripsacum dactyloides, gynomonecious sex form (gsf1) stock shows allelic non-complementation between the two re cessive genes. A successful test of allelism would demonstrate a simil arity of linkage organization and gene function/expression between the two genetic systems which is not restricted by floral or genus distin ctions. Inflorescence morphology of a ts2/gsf1 hybrid exhibits complet e sex reversal of the male portions of the primary tassel. Additional individuals from the same cross, having a ts2/GSF1 genetic constitutio n, produce normal male floral organs. This attempt to test genetic non -complementation suggests similar if not identical levels of genetic f unction and regulation by the two genetic systems.