Selection of Tobacco Lines with a High Degree of Resistance to Tobacco Etch Virus. M. C. Johnson, Research Associate, Agricultural Research Service, U.S. Department of Agriculture, Department of Plant Pathology, University of Kentucky, Lexington 40546. T. P. Pirone, Professor, and C. C. Litton, Research Agronomist, Agricultural Research Service, U.S. Department of Agriculture, Department of Plant Pathology, University of Kentucky, Lexington 40546. Plant Dis. 66:295-297. Accepted for publication 23 June 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-295.

Resistance of tobacco introduction 1406 to tobacco etch virus, as defined by a lack of visible symptoms, is controlled by a single recessive gene that must be homozygous to give resistance. However, studies with plants of the resistant phenotype indicated that modifying factors may be acting to determine levels of virus concentration reached in the resistant, symptomless plants. Selection and selfing of resistant plants that supported very low levels of virus multiplication showed that this character was heritable.

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