Population genetic structure of the sheath blight pathogen Rhizoctonia solani AG-1 IA from rice fields in China, Japan and the Philippines
Document title: Population genetic structure of the sheath blight pathogen Rhizoctonia solani AG-1 IA from rice fields in China, Japan and the Philippines
Journal: Acta scientiarum. Agronomy
Database: PERIÓDICA
System number: 000459993
ISSN: 1679-9275
Authors: 1
2
3
4
5
4
Institutions: 1University of the Philippines Los Baños, College of Agriculture and Food Science, Laguna. Filipinas
2Swiss Federal Institute of Technology Lausanne, Institute of Integrative Biology, Zurich. Suiza
3Meijo University, Faculty of Agriculture, Tempaku, Nagoya. Japón
4Universidade Estadual Paulista "Julio de Mesquita Filho", Departamento de Fitossanidade, Engenharia Rural e Solos, Ilha Solteira, Sao Paulo. Brasil
5Instituto Federal de Sao Paulo, Sao Paulo. Brasil
Year:
Volumen: 42
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, analítico
English abstract Sheath blight, caused by the fungal pathogen Rhizoctonia solani AG-1 IA is one of the most important rice diseases worldwide. The objetives of this study was to determine the predominant reproductive system and the genetic structure of 18 rice-infecting populations of R. solani sampled from China, Japan and the Philippines, the most important rice production countries in Asia. 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. From a total of 717 isolates, 423 unique multilocus genotypes were detected based on nine microsatellite loci. The three country populations of R. solani AG-1 IA exhibited a mixed reproductive system, which included both sexual and asexual components. A moderate degree of clonality indicated that the asexual sclerotia represent important source of inoculum. Population subdivision varied within and among countries, fitting the isolation by distance model. While no subdivision was found among populations within Japan or within the Philippines, subdivision was detected among populations within China. Historic migration indicated high influx of immigrants from Japan into Northern, Central and Eastern China populations. Southern China contributed a high number of immigrants to the populations from the Philippines
Disciplines: Agrociencias,
Biología
Keyword: Fitopatología,
Hongos,
Gramíneas,
Arroz,
Marcadores genéticos,
Microsatélites,
Thanatephorus cucumeris,
Flujo génico
Keyword: Fungi,
Phytopathology,
Gramineae,
Rice,
Genetic markers,
Microsatellites,
Thanatephorus cucumeris,
Gene flow
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