Turnip Mosaic Virus Strains in Cruciferous Hosts in Taiwan

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Abstract
An islandwide survey of the major vegetable production areas of Taiwan was conducted to determine the presence, distribution and prevalence of strains of turnip mosaic cirus (TuMV) affecting Chinese cabbage (Brassica campestris ssp. pekinensis), radish (Raphanus sativus) and smooth-leaf mustard (B. juncea). In addition to the 4 strains of the virus described in the USA, a 5th strain (TuMV-C5) was found that is capable of systemically infecting the multiresistant Chinese cabbage PI 418957. The physical and serological properties of strain C5 were indistinguishable from the other strains except for its low absorbance values in enzyme-linked immunosorbent assay. TuMV-C4 appeared to be the most widespread strain, followed in decreasing prevalence by C2, C3, C5 and C1. Resistance to TuMV-C5, as well as to the other 4 strains, was found in plants of the Chinese cabbage line AVRDC Acc. 730.