Genetics of resistance to five strains of turnip mosaic virus in Chinese cabbage

Abstract

Inheritance of resistance to turnip mosaic virus (TuMV) strains C1, C2, C3, C4, and C5 in Chinese cabbage (Brassica campestris subsp. pekinensis) was evaluated using monoclonal antibodies. Crosses were made between a resistant line, ‘0–2’, and four susceptible line. ‘Seoul’ (SE),‘SSD31’ (SS), ‘Cheongbang’ (CH), and ‘Yaki 1 ho’ (YA), to determine the inheritance of resistance of ‘0–2’ in different genetic backgrounds. Resistance to TuMV was controlled by a single dominant gene or double dominant genes depending on the strain and cross. The resistance genes of ‘0–2’ were modified by susceptible parents such that a single dominant gene was involved in the ‘SS×0–2’ combination, but double dominant genes in the ‘SE×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.