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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.

Additional keywords: American chestnut, biological control, chestnut blight, hypovirulence.