单型异养菌属Relictithismia (Thismiaceae)的高菌根特异性。

IF 3.8 2区 生物学 Q2 MYCOLOGY
Kenji Suetsugu, Hidehito Okada
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引用次数: 0

摘要

异养真菌植物完全依赖菌根真菌获取碳,通常对其真菌伴侣表现出高度特异性。蓟科的成员通常以其极端的菌根特化和稀缺性而闻名。在本研究中,我们利用18S rRNA基因的高通量DNA测序,研究了最近发现的蓟科单型属Relictithismia和日本南部分布相似的蓟属Thismia abei的菌根关联。结果表明,kimotsukiensis和abei都与根食菌属(Glomeraceae)的两个特定虚拟类群VTX00295和VTX00106有明显的亲缘关系。这些共同的关联可能反映了系统发育生态位的保守性,即kimmotsukiensis和T. abei的共同祖先保留了相同的AM真菌伴侣,或者趋同进化,即AM真菌种型因其对这些真菌异养植物的潜在益处而被独立招募。此外,BLAST研究表明,VTX00295和VTX00106在全球广泛分布,这表明高度专一的菌根相互作用不太可能是kimmotsukiensis和abbei分布有限和稀有的主要驱动因素。总的来说,我们的发现增强了我们对蓟科菌根高特异性的理解。然而,需要更广泛的调查,结合广泛的采样和祖先状态重建,来确定这里检测到的共同关联是反映了系统发育生态位的保守性还是趋同进化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High mycorrhizal specificity in the monotypic mycoheterotrophic genus Relictithismia (Thismiaceae).

Mycoheterotrophic plants, which depend entirely on mycorrhizal fungi for carbon acquisition, often exhibit high specificity toward their fungal partners. Members of Thismiaceae are generally recognized for their extreme mycorrhizal specialization and rarity. In this study, we examined the mycorrhizal associations of Relictithismia, a recently discovered monotypic genus within Thismiaceae, and Thismia abei, a Thismia species with a similar distribution in southern Japan, by employing high-throughput DNA sequencing of the 18S rRNA gene. Our analyses revealed that both R. kimotsukiensis and T. abei are predominantly associated with two specific virtual taxa (VTX00295 and VTX00106) of the genus Rhizophagus (Glomeraceae). These shared associations may reflect either phylogenetic niche conservatism, in which the common ancestor of R. kimotsukiensis and T. abei retained the same AM fungal partners, or convergent evolution, in which the AM fungal phylotypes were independently recruited due to their potential benefits for these mycoheterotrophic plants. Furthermore, BLAST searches demonstrated that VTX00295 and VTX00106 are widely distributed globally, suggesting that highly specialized mycorrhizal interactions are unlikely to be the primary drivers of the limited distribution and rarity of R. kimotsukiensis and T. abei. Overall, our findings enhance our understanding of high mycorrhizal specificity in Thismiaceae. However, broader investigations, combining extensive sampling of Thismiaceae species with ancestral state reconstruction, are needed to determine whether the shared associations detected here reflect phylogenetic niche conservatism or convergent evolution.

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来源期刊
Mycorrhiza
Mycorrhiza 生物-真菌学
CiteScore
8.20
自引率
2.60%
发文量
40
审稿时长
6-12 weeks
期刊介绍: Mycorrhiza is an international journal devoted to research into mycorrhizas - the widest symbioses in nature, involving plants and a range of soil fungi world-wide. The scope of Mycorrhiza covers all aspects of research into mycorrhizas, including molecular biology of the plants and fungi, fungal systematics, development and structure of mycorrhizas, and effects on plant physiology, productivity, reproduction and disease resistance. The scope also includes interactions between mycorrhizal fungi and other soil organisms and effects of mycorrhizas on plant biodiversity and ecosystem structure. Mycorrhiza contains original papers, short notes and review articles, along with commentaries and news items. It forms a platform for new concepts and discussions, and is a basis for a truly international forum of mycorrhizologists from all over the world.
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