Studies on Ralstonia solanacearum in Korea Republic
The genetic diversity and distribution of Ralstonia solanacearum (EPPO A2 List) was studied in the Republic of Korea. Between 1997 and 2005, 478 isolates were collected from wilted plants (tomato, potato, capsicum, aubergine, sesame, sunflower, peanut) at 90 different locations in 9 Korean provinces. Genetic diversity was determined on the basis of biovar, pathogenicity, AFLP, and gene sequence analyses (16S rRNA, endoglucanase, hrpB, mutS). Studies showed that 440 isolates belonged to biovars 1, 3 or 4, and that 38 belonged to biovar 2. In particular, biovar 2 (race 3) isolates* were found only in cultivated tomato and potato fields in the south of the country. These isolates were found in 2 sites at Jeju-do, 2 sites at Jeollanam-do and 3 sites at Gyeongsangnam-do. As it is considered that race 3 (biovar 2) probably originates from the Andean region, it is supposed that these types of isolates have been introduced into Korea by the international trade of potatoes.
* The EPPO Secretariat had no previous data on the occurrence of R. solanacearum biovar 2 (race 3) in Korea Republic.
Jeong Y, Kim J, Kang Y, Lee S, Hwang I (2007) Genetic diversity and distribution of Korean isolates of Ralstonia solanacearum. Plant Disease 91(10), 1277-1287.