Genetic structure of populations of Rhizoctonia solani anastomosis group-1 IA from soybean in Brazil
| Autor: | Bruce A. McDonald, Paulo Cezar Ceresini, Marcello Zala, Maurício Conrado Meyer, Maisa B. Ciampi, Mauro J.N. Costa |
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| Přispěvatelé: | Swiss Fed Inst Technol, Universidade Estadual Paulista (Unesp), Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), Fundação Rio Verde |
| Rok vydání: | 2008 |
| Předmět: |
Genetic diversity
education.field_of_study Veterinary medicine biology Human Growth Hormone Population size Population food and beverages Population genetics Genetic Variation Plant Science biology.organism_classification Rhizoctonia Rhizoctonia solani Genetic structure Genetic variation Botany Biological dispersal Soybeans education Agronomy and Crop Science Brazil Demography Plant Diseases |
| Zdroj: | Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 0031-949X 1538-5000 |
| Popis: | Made available in DSpace on 2013-08-12T18:05:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-08-01 Made available in DSpace on 2013-09-30T18:13:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-08-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T13:30:17Z No. of bitstreams: 0 Made available in DSpace on 2014-05-20T13:30:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-08-01 The Basidiomycete fungus Rhizoctonia solani anastomosis group (AG)-1 IA is a major pathogen of soybean in Brazil, where the average yield losses have reached 30 to 60% in some states in Northern Brazil. No information is currently available concerning levels of genetic diversity and population structure for this pathogen in Brazil. A total of 232 isolates of R. solani AG1 IA were collected from five soybean fields in the most important soybean production areas in central-western, northern, and northeastern Brazil. These isolates were genotyped using 10 microsatellite loci. Most of the multilocus genotypes (MLGTs) were site-specific, with few MLGTs shared among populations. Significant population subdivision was evident. High levels of admixture were observed for populations from Mato Grosso and Tocantins. After removing admixed genotypes, three out of five field populations (Maranhao, Mato Grosso, and Tocantins), were in Hardy-Weinberg (HW) equilibrium, consistent with sexual recombination. HW and gametic disequilibrium were found for the remaining soybean-infecting populations. The findings of low genotypic diversity, departures from HW equilibrium, gametic disequilibrium, and high degree of population subdivision in these R. solani AG-1 IA populations from Brazil are consistent with predominantly asexual reproduction, short-distance dispersal of vegetative propagules (mycelium or sclerotia), and limited long-distance dispersal, possibly via contaminated seed. None of the soybean-infecting populations showed a reduction in population size (bottleneck effect). We detected asymmetric historical migration among the soybean-infecting populations, which could explain the observed levels of subdivision. Swiss Fed Inst Technol, Inst Integrat Biol, Zurich, Switzerland UNESP, Dept Fitossanidade Engn Rural & Solos, BR-15385000 Ilha Solteira, SP, Brazil Univ Estadual Paulista, UNESP, Grad Program Genet & Plant Breeding, Jaboticabal, SP, Brazil Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Scja, Balsas, MA, Brazil Fundação Rio Verde, Lucas do Rio Verde, MT, Brazil UNESP, Dept Fitossanidade Engn Rural & Solos, BR-15385000 Ilha Solteira, SP, Brazil Univ Estadual Paulista, UNESP, Grad Program Genet & Plant Breeding, Jaboticabal, SP, Brazil |
| Databáze: | OpenAIRE |
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