![]() While no subdivision was found among populations within Japan or within the Philippines, subdivision was detected among populations within China. Population subdivision varied within and among countries, fitting the isolation by distance model. ![]() A moderate degree of clonality indicated that the asexual sclerotia represent important source of inoculum. solani AG-1 IA exhibited a mixed reproductive system, which included both sexual and asexual components. From a total of 717 isolates, 423 unique multilocus genotypes were detected based on nine microsatellite loci. Knowledge about the population genetic structure of the pathogen in Asia is useful in identifying sources of infection and formulating sustainable management strategies for rice sheath blight. solani sampled from China, Japan and the Philippines, the most important rice production countries in Asia. The objetives of this study was to determine the predominant reproductive system and the genetic structure of 18 rice-infecting populations of R. Sheath blight, caused by the fungal pathogen Rhizoctonia solani AG-1 IA is one of the most important rice diseases worldwide.
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