title: Use of the IRAP marker to study genetic variability in Pseudocercospora fijiensis populations.
abstract: Pseudocercospora fijiensis is the etiological agent of black Sigatoka, which is currently considered as one of the most destructive banana diseases in all locations where it occurs. It is estimated that a large portion of the P. fijiensis genome consists of transposable elements, which allows researchers to use transposon-based molecular markers in the analysis of genetic variability in populations of this pathogen. In this context, the inter-retrotransposon-amplified polymorphism (IRAP) was used to study the genetic variability in P. fijiensis populations from different hosts and different geographical origins in Brazil. A total of 22 loci were amplified and 77.3 % showed a polymorphism. Cluster analysis revealed two major groups in Brazil. The observed genetic diversity (H E) was 0.22, and through molecular analysis of variance, it was determined that the greatest genetic variability occurs within populations. The discriminant analysis of principal components revealed no structuring related to the geographical origin of culture of the host. The IRAP-based marker system is a suitable tool for the study of genetic variability in P. fijiensis.
authors.affiliation: Departamento de Microbiologia, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil.
authors.forename: Casley Borges
authors.initials: CB
authors.lastname: de Queiroz
authors.forename: Mateus Ferreira
authors.initials: MF
authors.lastname: Santana
authors.forename: Gilvan Ferreira
authors.initials: GF
authors.lastname: da Silva
authors.forename: Eduardo Seiti Gomide
authors.initials: ES
authors.lastname: Mizubuti
authors.forename: Elza Fernandes
authors.initials: EF
authors.lastname: de Araújo
authors.forename: Marisa Vieira
authors.initials: MV
authors.lastname: de Queiroz
mesh_terms: D001203:Ascomycota / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D001938:Brazil; D016000:Cluster Analysis; D014644:Genetic Variation; D005838:Genotype; D058889:Molecular Typing / Q000379:methods*; D028521:Musa / Q000382:microbiology; D016533:Mycological Typing Techniques / Q000379:methods*; D010935:Plant Diseases / Q000382:microbiology; D018515:Plant Leaves / Q000382:microbiology