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Resistance

Evaluation of Tobacco Introduction 1406 as a Source of Virus Resistance. M. C. Johnson, Department of Plant Pathology, University of Kentucky, Lexington 40546; T. P. Pirone, Department of Plant Pathology, University of Kentucky, Lexington 40546. Phytopathology 72:68-71. Accepted for publication 23 April 1981. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-68.

The resistance of Tobacco Introduction (TI) 1406 plants to infection by three potyviruses, potato virus Y (PVY), tobacco etch virus (TEV), and tobacco vein-mottling virus (TVMV) was dependent on the specific virus or virus strain present in the inoculum. Resistance of TI 1406 to TVMV and a mild strain of TEV (TEV-M) was characterized by curtailed or limited virus movement and drastically reduced virus multiplication. Infection of TI 1406 with a severe isolate of TEV (TEV-A) or PVY resulted in systemic symptoms less severe than those of the controls (cultivar Burley 21), but virus titers in T.I. 1406 were equivalent to those in Burley 21. Symptoms produced on TI 1406 infected with a number of viruses outside the potyvirus group were as severe as those on Burley 21 controls.