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Bull. Spec. CORESTA Symposium, Kallithea, 1990, p. 177, P20, ISSN.0525-6240

Study of tomato spotted wilt resistant tobacco lines

IANTCHEVA A.M.
Complex Experimental Station, Haskovo, Bulgaria.
The object of this study was to transfer the TSWV resistance gene from the wild Nicotiana alata species to Oriental tobacco, Nicotiana tabacum, by means of the Line 9693/1. Besides TSWV resistance the breeding material obtained had to possess the inherent morphological characteristics of Oriental tobacco. The experiments were carried out during 1984-1989 in the Central Laboratory of the Tobacco Industry in Krakow, Poland and in the Complex Experimental Station in Haskovo, Bulgaria. Hybridization included the Line 9693/1 with TSWV resistance originating from N. alata and the highly susceptible Oriental varieties Krumovgrad 58, Krumovgrad 840, Krumovgrad 176 and Harmanlii 11. It was found out that the TSWV resistance of Line 9693/1 is transferred dominantly in F1 hybrids and is controlled by a dominant gene. The hybridization and purposeful selection carried out resulted in Oriental type tobacco lines with constant resistance to tomato spotted wilt. These lines are characterized by good economic and chemical indices and can be used in tobacco selection.