Occurrence and Biovar Classification of Bacterial Wilt Caused by Ralstonia solanacearum in Eggplant (Solanum melongena)

Lim, Yang Sook; Lee, Mun Jung; Cheung, Jong Do; Rew, Young Hyun; Kim, Byung Soo

Research in Plant Disease 2008;14(1):10-14.
Published online April 30, 2008.

가지의 Ralstonia solanacearum에 의한 풋마름병 발생과 생리형의 분화

임양숙, 이문중, 정종도, 류영현, 김병수

Occurrence and Biovar Classification of Bacterial Wilt Caused by Ralstonia solanacearum in Eggplant (Solanum melongena)

Yang Sook Lim, Mun Jung Lee, Jong Do Cheung, Young Hyun Rew, Byung Soo Kim

Abstract

Batcterial wilt caused by Ralstonia solanacearum is one of important and widespread diseases worldwide as well as in Korea. Bacterial wilt disease caused by R. solanacearum has been reported mainly in solanaceous crops including eggplant (Solanum melongena), tomato (Solanum lycopersicum), potato (S. tuberosum), and pepper (Capsicum annuum). A total of 48 strains of R. solanacearum from eggplant were collected during 2005 and 2006. They were confirmed as R. solanacearum by PCR amplification with primer pair flipcF/flipcR resulting in production of 470-bp DNA fragment. The 15 isolates exhibited pathogenicity on eggplant and tomato, but less virulent on pepper than other species. The biovar of collected isolates, which have been reported of five types worldwide, were classified as biovars 3 and 4 by physiological test. Biovar 4 was the dormant type without pathogenicity on eggplant rootstock, whereas biovar 3 had pathogenicity on eggplant rootstocks that is resistant to R. solanacearum, indicating necessity of breeding new rootstock with resistance to R. solanacearum biovar 3

Key Words: Biovar, Eggplant, Ralstonia solanacearum