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The Killer System in Ustilago maydis: Heterokaryon Transfer and Loss of Determinants. P. R. Day, Genetics Department, The Connecticut Agricultural Experiment Station, P.O. Box 1106, New Haven 06504; S. L. Anagnostakis, Genetics Department, The Connecticut Agricultural Experiment Station, P.O. Box 1106, New Haven 06504. Phytopathology 63:1017-1018. Accepted for publication 16 February 1973. DOI: 10.1094/Phyto-63-1017.

The properties of killer production and resistance to killer are cytoplasmically determined and transmitted at dikaryon formation. A spontaneous mutant cured of killer production could not be reinfected with the killer determinant.