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首页> 外文期刊>Mycologia >The status and characterization of Enteroramus dimorbhus: a xylose-fermenting yeast attached to the gut of beetles
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The status and characterization of Enteroramus dimorbhus: a xylose-fermenting yeast attached to the gut of beetles

机译：Enteroramus dimorbhus的状态和特征：附着在甲虫肠道上的木糖发酵酵母

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摘要

Enteroramus dimorphus from the gut of the passalid beetle Odontotaenius disjunctus was described originally as a yeast-like fungus of unknown taxonomic affiliation. The fungus can be observed in situ, attached by a specialized cell to the beetle hindgut wall. In a recent study of yeast endosymbionts from a variety of beetles, we discovered that E. dimorphus is a member of the Pichia stipitis (Saccharomycetes) clade, known for xylose fermentation and assimilation. The closest relative of E. dimorphus is the PASSI isolate, repeatedly acquired from passalid beetles in eastern North America from Pennsylvania to Louisiana. In addition to xylose fermentation and assimilation, these yeasts are characterized by the production of hat-shaped ascospores in culture, assimilation of a wide range of sugars, and synthesis of several vitamins. Enteroramus dimorphus, however, can be distinguished from close relatives by several physiological characteristics and rDNA sequences, which vary slightly from the more widespread PASSI genotype. We present an amended description of E. dimorphus and discuss its symbiotic phase in association with O. disjunctus, including a holdfast that parallels those of unrelated symbiotic yeasts associated with nematodes.
机译：来自Passalid甲虫Odontotaenius disjunctus肠道的二形肠杆菌最初被描述为未知分类学隶属的酵母样真菌。可以原位观察到真菌，该真菌通过专门的细胞附着在甲虫后肠壁上。在最近对来自各种甲虫的酵母内共生菌的研究中，我们发现二形大肠杆菌是一种以木糖发酵和同化作用着称的毕赤酵母（Saccharomycetes）进化枝的成员。最接近的E. dimorphus亲戚是PASSI分离株，从北美东部从宾夕法尼亚州到路易斯安那州的Passalid甲虫反复获得。除了木糖发酵和同化作用外，这些酵母菌的特征还在于培养中产生帽子状的子囊孢子，多种糖的同化作用以及几种维生素的合成。然而，双歧肠型肠炎可以通过几种生理特征和rDNA序列与近亲相区别，这与更广泛的PASSI基因型略有不同。我们目前对双歧杆菌的描述进行了修订，并讨论了与双歧杆菌的共生相，包括与线虫无关的共生酵母平行的固着物。

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