ABSTRACT

The aim of investigation was to study the transmission of TMV resistance in some commercial varieties of oriental tobacco by the method of backcross hybridization. Investigation included resistant introduced oriental varieties (AA) and one susceptible variety (aa). In relation to other qualitative and productional characteristics, the latter variety was good for buyers. In F1, resistant heterozygous progeny (Aa) was obtained, which was back-pollinated with pollen of the recipient variety (aa). In BC1, as well as in other generations up to BC4 and BC5, resistant plants, phenotypically more similar to the recipient variety, were pollinated again with the pollen of this variety. Infective juice from diseased plants was used for inoculation of plants from hybrid generations, using the method of Ternovskiy.