title: Genetic structure of Pyrenophora teres net and spot populations as revealed by microsatellite analysis.
abstract: The population structure of the fungal pathogen Pyrenophora teres, collected mainly from different regions of the Czech and Slovak Republics, was examined using a microsatellite analyses (SSR). Among 305 P. teres f. teres (PTT) and 82 P. teres f. maculata (PTM) isolates that were collected, the overall gene diversity was similar (ĥ = 0.12 and ĥ = 0.13, respectively). A high level of genetic differentiation (FST = 0.46; P < 0.001) indicated the existence of population structure. Nine clusters that were found using a Bayesian approach represent the genetic structure of the studied P. teres populations. Two clusters consisted of PTM populations; PTT populations formed another seven clusters. An exact test of population differentiation confirmed the results that were generated by Structure. There was no difference between naturally infected populations over time, and genetic distance did not correlate with geographical distance. The facts that all individuals had unique multilocus genotypes and that the hypothesis of random mating could not be rejected in several populations or subpopulations serve as evidence that a mixed mating system plays a role in the P. teres life cycle. Despite the fact that the genetic differentiation value between PTT and PTM (FST = 0.30; P < 0.001) is lower than it is between the populations within each form (FST = 0.40 (PTT); FST = 0.35 (PTM); P < 0.001) and that individuals with mixed PTT and PTM genomes were found, the two forms of P. teres form genetically separate populations. Therefore, it can be assumed that these populations have most likely undergone speciation.
authors: Department of Molecular Biology, Crop Research Institute Prague, Drnovská 507, Prague 6 - Ruzyně 161 06, Czech Republic. Electronic address: leisova@vurv.cz.
authors: Leona
authors: L
authors: Leišová-Svobodová
authors: Agrotest fyto, ltd., Havlíčkova 2787, Kroměříž 767 07, Czech Republic.
authors: Věra
authors: V
authors: Minaříková
authors: Agrotest fyto, ltd., Havlíčkova 2787, Kroměříž 767 07, Czech Republic.
authors: Pavel
authors: P
authors: Matušinsky
authors: Plant Production Research Centre Piešťany, Bratislavská cesta 122, Piešťany 921 68, Slovak Republic.
authors: Martina
authors: M
authors: Hudcovicová
authors: Plant Production Research Centre Piešťany, Bratislavská cesta 122, Piešťany 921 68, Slovak Republic.
authors: Katarína
authors: K
authors: Ondreičková
authors: Plant Production Research Centre Piešťany, Bratislavská cesta 122, Piešťany 921 68, Slovak Republic.
authors: Jozef
authors: J
authors: Gubiš
mesh_terms: D001203:Ascomycota / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D016000:Cluster Analysis; D018153:Czech Republic; D014644:Genetic Variation; D005838:Genotype; D018895:Microsatellite Repeats; D058889:Molecular Typing; D016533:Mycological Typing Techniques; D010802:Phylogeny; D018154:Slovakia
keywords: Drechslera teres; Hordeum vulgare; PTM; PTT; SSR