The Plant Pathology Journal 2005;21(4):369-376.
Published online December 31, 2005.
Virulence Differentiation of Eight Turnip mosaic virus Isolates Infecting Cruciferous Crops
Hong Soo Choi, Seong Han Sohn, Moo Kyoung Yoon, Jeong Uk Cheon, Jeong Soo Kim, Hassan Karakacha Were, Jang Kyung Choi, Kook Hyung Kim, Yoichi Takanami
Turnip mosaic virus (TuMV) is an infectious viral pathogen on the cruciferous crops, predominantly Chinese cabbage (Brassica campestris subsp. pekinensis) and radish (Raphanus sativus). On the basis of the symptom development in selective differential hosts from indicator host species, Chinese cabbage and Korean radish inbred lines, the representative eight isolates of TuMV were divided into two major groups/or six types. Group I includes Tu 1, Ca-ad7, and Cj-ca2-1 isolates, while group II includes the other isolates (rg-pf1, r 9-10, Rhcq1- 2, Stock and Mustard). According to the molecular phylogenetic analysis, these isolates, however, divided into two groups and two independent isolates. Phylogenetic analysis indicated that four isolates (Tu 1, r 9-0,Stock and Rh-cq1-2) formed a distinct phylogenetic group, and the other two isolates (Ca-ad7 and Cj-ca2-1) also formed another group. Mustard and rg-pf1 isolates did not seem to have any relationship with these two groups. Taken together, these results indicated that virulence differentiation on host plants, molecular phylogenetic analysis of the nucleotide and the deduced amino acid of TuMV coat proteins did not show any relationship. The multi-resistant lines, Wonyae 20026 and BP058 in Chinese cabbage represent valuable genetic materials that can be used for crucifer breeding programs on TuMV resistance, but not in Korean radish.
Key Words: cruciferous crops, resistance, Turnip mosaic virus, virulence differentiation

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