Publication details
Genetic Analyses Suggest Separate Introductions of the Pine Pathogen Lecanosticta acicola Into Europe
| Authors | |
|---|---|
| Year of publication | 2016 |
| Type | Article in Periodical |
| Magazine / Source | Phytopathology |
| MU Faculty or unit | |
| Citation | |
| Doi | http://dx.doi.org/10.1094/PHYTO-10-15-0271-R |
| Field | Zoology |
| Keywords | Approximate Bayesian Computation; fungus; haploid; reproductive mode; Mycosphaerella dearnessii; population genetics |
| Description | Lecanosticta acicola is a heterothallic ascomycete that causes brown spot needle blight on native and non-native Pinus spp. in many regions of the world. In this study we investigated the origin of European L. acicola populations and estimated the level of random mating of the pathogen in affected areas. Part of the Elongation Factor 1-alpha gene was sequenced, eleven microsatellite regions were screened, and the mating type idiomorphs were determined for 201 isolates of L. acicola collected from three continents and 17 host species. The isolates from Mexico and Guatemala were unique, highly diverse and could represent cryptic species of Lecanosticta. The isolates from East Asia formed a uniform and discrete group. Two distinct populations were identified in both North America and Europe. Approximate Bayesian Computation analyses strongly suggest independent introductions of two populations from North America into Europe. Microsatellite data and mating type distributions indicated random recombination in the populations of North America and in Europe. Its inter-continental introduction can most likely be explained as a consequence of the movement of infected plant material. In contrast, the spread of L. acicola within Europe appears to be primarily due to conidial dispersion and probably also ascospore dissemination. |