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Abstract
Tilletia controversa was hybridized with T. bromi and T. laevis in wheat plants under greenhouse conditions. Teliospore morphology, germination rate and segregation of RAPD markers confirmed the identity of the F1, progeny as interspecific hybrids. The T. controversa X T. bromi hybrids exhibited reduced basidiospore fusion and pathogenicity, and a high rate of basidiospore mortality relative to the parental lines and T. controversa X T. laevis hybrids. Distortion observed in the segregation of RAPD markers in T. controversa X T. bromi hybrids, but not in T. controversa X T. laevis hybrids, may be due to greater overall differences between the genomes of T. controversa and T. bromi relative to T. controversa and T. laevis. Tilletia controversa has limited sexual compatibility with T. bromi but their hybrids are not likely to survive under natural conditions.