School of Biological Sciences, University of Auckland, Auckland, New Zealand.
FEMS Yeast Res. 2010 Nov;10(7):941-7. doi: 10.1111/j.1567-1364.2010.00681.x. Epub 2010 Sep 24.
Saccharomyces cerevisiae and Saccharomyces paradoxus are used as model systems for molecular, cell and evolutionary biology; yet we know comparatively little of their ecology. One niche from which these species have been isolated is oak bark. There are no reports of these species from oak in the Southern Hemisphere. We describe the recovery of both S. cerevisiae and S. paradoxus from oak in New Zealand (NZ), and provide evidence for introgression between the species. Genetic inference shows that the oak S. cerevisiae are closely related to strains isolated from NZ and Australian vineyards, but that the S. paradoxus strains are very closely related to European isolates. This discovery is surprising as the current model of S. paradoxus biogeography suggests that global dispersal is rare. We test one idea to explain how members of the European S. paradoxus population might come to be in NZ: they were transported here along with acorns brought by migrants approximately 200 years ago. We show that S. paradoxus is associated with acorns and thus provide a potential mechanism for the unwitting global dispersal of S. paradoxus by humans.
酿酒酵母和毕赤酵母被用作分子、细胞和进化生物学的模式系统；然而，我们对它们的生态学了解相对较少。这些物种被分离出来的一个生态位是橡树皮。在南半球还没有关于橡木上存在这些物种的报道。我们描述了从新西兰（NZ）的橡木中回收酿酒酵母和毕赤酵母，并提供了种间基因渗入的证据。遗传推断表明，橡木中的酿酒酵母与从新西兰和澳大利亚葡萄园分离的菌株密切相关，但毕赤酵母菌株与欧洲分离株非常密切相关。这一发现令人惊讶，因为目前的毕赤酵母生物地理学模型表明，全球传播是罕见的。我们测试了一个想法来解释欧洲毕赤酵母种群中的成员如何来到新西兰：它们是大约 200 年前随着移民带来的橡果一起被带到这里的。我们表明，毕赤酵母与橡果有关，因此为人类无意识地将毕赤酵母全球传播提供了一个潜在机制。
