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Genetics

Nuclear Gene Mutations in Endothia (Cryphonectria) parasitica that Affect Morphology and Virulence. Sandra L. Anagnostakis, Department of Plant Pathology and Botany, Connecticut Agricultural Experiment Station, Box 1106, New Haven 06504; Phytopathology 74:561-565. Accepted for publication 9 February 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/Phyto-74-561.

Crossing and progeny analyses showed that five deeply pigmented hypovirulent strains contain single nuclear genes that confer the morphology characteristic of a class of European hypovirulent strains formerly called Jaune Régénéré or Pigmentato. These single nuclear genes also determine restricted virulence in host chestnut trees. Such strains arise only from dsRNA-containing strains and may be the result of integration of cytoplasmic genetic material into the nuclear genome.