Whole genome resequencing of 25 isolates of the ascomycete pine pathogen Dothistroma septosporum revealed the presence of three genetically distinct races in Scotland, confirming previous results based on microsatellite markers. The genetically uniform indigenous race from Scotland (NPR), is closely related to an introduced and genetically diverse southern race (SR) from England and France. Race LPR, confined to lodgepole pine, is genetically divergent from these, but has close affinity with Canadian (CAN) isolates. Genome comparisons between individuals within CAN and SR races revealed short and scattered regions of near sequence identity, indicating significant sexual reproduction. Sequence identity patterns within LPR suggest that it derives from introduction of a single sexual fruit body from North America. Finally a first generation interracial hybrid between indigenous NPR and introduced SR was identified, signalling an increase in the evolutionary potential of D. septosporum in Scotland, and an enhanced risk to native Scots pine (Pinus sylvestris).

子囊菌松树病原体Dothistroma septosporum的25个分离株的全基因组重测序揭示了苏格兰存在三个基因不同的种族，从而证实了以前基于微卫星标记的结果。来自苏格兰（NPR）的遗传上统一的原住民种族与来自英格兰和法国的，遗传上不同的南方种族（SR）密切相关。种族LPR限于寄主松，在遗传上与这些松散不同，但与加拿大（CAN）分离株具有密切的亲和力。在CAN和SR种族中，个体之间的基因组比较显示出近距离序列同一性的短而分散的区域，表明有性繁殖。LPR内的序列同一性模式表明，它来自北美引进的单个有性子实体。最后，我们确定了本地NPR与引入的SR之间的第一代异族杂交，D. septosporum在苏格兰，对本地苏格兰松（Pinus sylvestris）的风险增加。