Marteilia refringens is one of the most significant pathogens of bivalve molluscs. Previous sequencing of the small subunit ribosomal RNA gene of M. refringens isolates derived from the infected mussels (Mytilus edulis and Mytilus galloprovinciallis) and the oyster (Ostrea edulis) in Europe did not reveal genetic polymorphisms despite indications from epizootiological data that distinct types may exist. We investigated the existence of polymorphisms in the internal transcribed spacer region of the ribosomal RNA genes. The sequences of this region proved to be clearly dimorphic among Marteilia from five sampling sites. The distribution of the two genetic types, named "O" and "M", appeared to be linked to the host species, oysters and mussels, respectively. We therefore support the recognition of two species of Marteilia in Europe and propose that the "O" type corresponds to M. refringens and the "M" type to M. maurini.

译文

Marteilia refringens是双壳软体动物最重要的病原体之一。先前对欧洲受感染的贻贝 (Mytilus edulis和Mytilus galloprovinciallis) 和牡蛎 (Ostrea edulis) 衍生的M. refringens分离株的小亚基核糖体RNA基因的测序并未揭示遗传多态性,尽管从流行病学数据表明可能存在不同的类型。我们研究了核糖体RNA基因内部转录间隔区中多态性的存在。该区域的序列在五个采样点的Marteilia中被证明是明显的二态性。两种遗传类型 “O” 和 “M” 的分布似乎分别与寄主物种牡蛎和贻贝有关。因此,我们支持在欧洲识别两种Marteilia,并建议 “O” 型对应于M. refringens,而 “M” 型对应于M. maurini。

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