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Relationship of Capacity to Cause Decay to Other Physiological Traits in Isolates of Lenzites trabea. Terry L. Amburgey, Former Graduate Research Assistant, Department of Plant Pathology, North Carolina State University, Raleigh 27607, now Pathologist, Forest and Wood Products Disease Laboratory, Southern Forest Experiment Station, U.S. Forest Service, Gulfport, Mississippi 39501. Phytopathology 60:955-960. Accepted for publication 14 January 1970. DOI: 10.1094/Phyto-60-955.

Studies of variation among homokaryotic, dikaryotic, and mono-oidial isolates of Lenzites trabea showed that (i) there is no consistent relationship between the incompatibility factor and rate of linear growth of an isolate and its capacity to cause decay; (ii) homokaryons with low decay capacities may be mated to form dikaryons with a much greater capacity to cause decay; (iii) no evidence was found that cytoplasmic factors will account for variation in capacity to cause decay; (iv) arsenic appears to de-dikaryotize isolates by accelerating a natural tendency toward a preponderance of one of the two nuclear types of a dikaryon; (v) the ratios of the two nuclear types in a dikaryon may influence its capacity to cause decay and the frequency with which it produces clamp-connections.