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首页> 外文期刊>Mycologia >Specificity and genetic diversity of xylose-fermenting Scheffersomyces yeasts associated with small blue stag beetles of the genus Platycerus in East Asia
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Specificity and genetic diversity of xylose-fermenting Scheffersomyces yeasts associated with small blue stag beetles of the genus Platycerus in East Asia

机译：木糖 - 发酵什叶径酵母的特异性和遗传多样性与东亚属Plantberus小蓝齿甲虫相关的酵母

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摘要

Among insect-fungus relationships, xylose-fermenting Scheffersomyces yeasts are well known for their potential in utilizing wood hemicelluloses and their association with various wood-feeding insects. However, their specificity to host insects or strain-level diversity within host species has not been clearly elucidated. In the insect family Lucanidae, larvae usually feed on decaying wood, and adult females consistently possess a fungus-storage organ, called the mycangium, near the abdominal tip. Here the authors investigated host-symbiont relationships between Scheffersomyces yeast symbionts and small blue stag beetles of the genus Platycerus (Coleoptera: Lucanidae) in East Asia by using intergenic spacer (IGS) region as a genetic marker. All yeast strains isolated from the female mycangiumof three Platycerus species, P. hongwonpyoi from Korea and P. acuticollis and P. delicatulus from Japan, were allied to Scheffersomyces segobiensis based on the sequences of the nrDNA 26S and internal transcribed spacer (ITS), in which no sequence difference was observed among those strains. However, IGS regions showed clear genetic differentiation within the yeast symbionts of P. hongwonpyoi, as well as between those of Korean and Japanese Platycerus species. In the IGS sequences, nucleotide substitutions were mainly distributed in the whole stretch of IGS1 and the anterior half of IGS2, whereas nucleotide gaps were localized at IGS1 and the middle of IGS2. Despite the conserved association between the Platycerus beetles and the specific strains of S. segobiensis in East Asia, geophylogenetic divergence patterns of the yeast symbionts were not concordant with those of the insect hosts.
机译：在昆虫 - 真菌关系中，木糖发酵什叶径酵母酵母是众所周知的，其潜力利用木质半纤维素及其与各种木材喂养昆虫的关联。然而，它们在宿主物种内宿主昆虫或菌株水平多样性的特异性并未明确阐明。在昆虫家族Lucanidae，幼虫通常在腐烂的木材上喂食，成年女性一直含有一个被称为豆髓的真菌储存器官，靠近腹部尖端。在这里，作者通过使用基因间隔物（IGS）区域作为遗传标记，研究了在东亚属Platycerus（鞘翅目）（鞘翅目）（鞘翅目）的小蓝齿甲虫（Coleoptera：Lucanidae）之间的宿主 - Symbiont关系。从雌性mycangiumof，P. Hongwonpyoi的所有酵母菌菌株从韩国和P.Acuticollis和日本的P. Delicatulus均基于NRDNA 26s和内部转录间隔（IT）的序列，依赖于Scheffersomyces segobiensis其中菌株中没有观察到序列差异。然而，IGS地区在P. Hongwonpyoi的酵母共生中显示出明显的遗传分化，以及韩国和日本Plat比尔斯物种之间的酵母共生。在IGS序列中，核苷酸取代主要分布在整个IGS1和IGS2的前半部分中，而核苷酸间隙在IGS1和IGS2的中间定位。尽管Platticerus甲虫与东亚的S.Segobiensis的特定菌株之间存在保守的关联，但酵母共生的地培解性偏差模式与昆虫宿主的影响不一致。

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