GENETICS OF RESISTANCE TO 5 STRAINS OF TURNIP MOSAIC-VIRUS IN CHINESE-CABBAGE

Inheritance of resistance to turnip mosaic virus (TuMV) strains C1, C2 , C3, C4, and C5 in Chinese cabbage (Brassica campestris subsp. pekine nsis) was evaluated using monoclonal antibodies. Crosses were made bet ween a resistant line, '0-2', and four susceptible lines. 'Seoul' (SE) , 'SSD31' (SS), 'Cheongbang' (CH), and 'Yaki 1 ho' (YA), to determine the inheritance of resistance of '0-2' in different genetic background s. Resistance to TuMV was controlled by a single dominant gene or doub le dominant genes depending on the strain and cross. The resistance ge nes of '0-2' were modified by susceptible parents such that a single d ominant gene was involved in the 'SS x 0-2' combination, but double do minant genes in the 'SE x 0-2' against TuMV-C3 or TuMV-C5. ELISA tests using inoculated and noninoculated leaves in the same plant suggested that the dominant resistance genes inhibit virus movement rather than virus multiplication.