Digging deeper into the evolutionary history of Rhynchosporium secalis

• Main Author: Castiblanco Vargas, Eveline Valheria
• Other Authors: McDonald, Bruce, García Domínguez, Celsa
• Format: Master Thesis
• Language: English
• Published: Universidad Nacional de Colombia 2011
• Subjects: 630 - Agricultura y tecnologías relacionadas::632 - Lesiones; enfermedades; plagas vegetales; Rhynchosporium secalis; Evolución; Hongos patógenos; evolution; pathogenic fungi; Materials and methods; Microsatellite genotyping; Haplotypic diversity; Iceland; Islandia
• Online Access: https://repositorio.unal.edu.co/handle/unal/9581; http://bdigital.unal.edu.co/6489/; https://repositorio.unal.edu.co/

ilustraciones, gráficas, tablas 24 field populations sampled in Europe and Ethiopia were assayed with eight microsatellite loci. Model based methods were used to infer the population structure and recent migration patterns. Allelic richness obtained in our study is consistent with the hypothesis of Scandinavia as center of origin. A population structure consisting in two different levels, namely population and region, was proposed. The AMOVA analysis showed that 80% of the variation was explained by the population level and 6% by the regional level. Isolation by distance was confirmed by Mantel test analysis. However, Icelandic, Ethiopian and Swiss populations did not fit such a model. The dynamic of migration of the Icelandic populations was consistent with a continent island model closer to the coalescence point. According with the geographic characteristics of Iceland in relation with the proposed center of origin, an active movement of infected seed mediated by humans is proposed to explain our results. In contrast, Swiss populations located in the same continent with the proposed center of origin, showed the highest differentiation values. Based on a recent migration analysis, we proposed that R. secalis populations are being modeled by human mediated migration. 24 poblaciones de R. secalis muestreadas en Europa y África fueron evaluadas para ocho loci microsatellites. Métodos basados en modelación fueron usados para inferir la estructura de la población y los patrones recientes de migración. Los índices de riqueza alélica obtenidos en nuestro estudio son consistentes con la hipótesis de Escandinavia como centro de origen. Una estructura poblacional de dos niveles, población y región, fue usada en nuestro estudio. El análisis de AMOVA mostro que el 80% de la varianza puede ser explicada por el nivel población y que un 6 % es explicado por el nivel región. El patrón de aislamiento por distancia fue confirmado mediante el test de mantel, a pesar de que las poblaciones de Etiopía, Islandia y Suiza no se ...