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http://dx.doi.org/10.5423/RPD.2004.10.4.217

Comparative Assay Fungus Population and Resistant Genes about Magnaporthe grisea between Korea and China  

Kim, Dong-Yun (Plant Pathology Division, National Institute of Agricultural Sciences &)
Shim, Hong-Sik (Technology)
Cailin, Lei (Plant Pathology Division, National Institute of Agricultural Sciences &)
Ling, Zhong Zhuan (Technology)
Han, Seong-Sook (Rice Research Division, Institute of Crop Breeding and Cultivation, CAAS)
Publication Information
Research in Plant Disease / v.10, no.4, 2004 , pp. 217-226 More about this Journal
Abstract
One hundred isolates of Magnaporthe grisea from Korea and China were characterized for pathogenicity using eight Korean differential varieties(KDV), six Chinese differential varieties(CDV) and six near isogenic lines(NILs) developed in China. The restriction length polymorphism of M. grisea isolates from each country also was analyzed using MGR586 as a probe. One hundred Korean isolates classified into 17 races on KDV were grouped into 29 pathotypes on Chinese near isogenic lines(NILs). Virulence of 46% of Korean isolates against all the six Chinese NILs indicated that the current six Chinese NILs alone was not enough to be used as differential varieties in Korea. Especially, susceptibility of the BL1 carrying resistance gene Pi-b to 70% of tested Korean isolates suggested that BL1(Pi-b) may not be a useful resistance source to Korean blast. Based on the virulence assays of M. grisea populations from each country were divided into two groups. About 50% of Chinese isolates showed similarity to the 30% of the Korean isolates. Especially, the isolates from northern part of China, where Japonica rice cultivars were grown, showed high similarity to the Korean isolates, while isolates from southern part of China, where Indica rice were mainly grown, showed low similarity to Korean isolates. The genome RFLPs of Korean isolates were quite different from those of southern part of China using MGR586 as a probe. These data indicated that the physiological and genetical characteristics of M. grisea population might be determined by strong interaction with cultivated rice.
Keywords
China; Korea; Resistant gene; RFLP; Rice blast;
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