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Genetics of Tobacco Resistance to Globodera tabacum tabacum. J. A. LaMondia, Department of Plant Pathology and Ecology, Connecticut Agricultural Experiment Station, Valley Laboratory, P.O. Box 248, Windsor, CT 06095. Plant Dis. 75:453-454. Accepted for publication 5 October 1990. Copyright 1991 The American Phytopathological Society. DOI: 10.1094/PD-75-0453.

Genotypes of tobacco (Nicotiana tabacum) resistant (R) or susceptible (S) to the nematode Globodera tabacum tabacum were crossed. F1 progeny were selfed and backcrossed to produce additional progeny for evaluation of resistance in greenhouse experiments. Plants without female nematodes visible (10 magnification) on the root surface 6 wk after inoculation were classified as resistant and those in which one or more females were evident were classified as susceptible. Segregation ratios were 3:1 for F2 (F1 F1) lines and 1:1 for BC1 (F1 S) lines, indicating that resistance to G. t. tabacum is conferred by a single, dominant gene.