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Genetic Modification of Echinulation on Teliospores of Ustilago hordei x U. nigra Hybrids

Teliospores of Ustilago hordei x U. nigra hybrids and their progeny were examined by scanning electron microscopy. The size of echinulations was affected by a recessive gene(s) that modified the expression of the major genes (E1E2) required to produce this morphological feature. Microenvironment did not affect echinulations. The most reduced echinulations appeared as slightly raised areas on the surface of the teliospore. Haploid lines that produced the reduced echinulations did so when crossed to each other and when back-crossed to the smooth-spored parent (U. hordei). The sorus type associated with teliospores having the least prominent echinulations was like that of U. hordei.