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Pythium intermedium, a species complex consisting of three phylogenetic species found in cool-temperate forest ecosystems
Fungal Biology ( IF 2.5 ) Pub Date : 2021-07-17 , DOI: 10.1016/j.funbio.2021.07.004
Mingzhu Li 1 , Ayaka Hieno 2 , Keiichi Motohashi 3 , Haruhisa Suga 4 , Koji Kageyama 2
Affiliation  

Pythium intermedium plays a vital role in the carbon cycle of cool-temperate forests and is widely distributed in Japan's forest soils. In this study, we performed a phylogenetic analysis of the P. intermedium species complex using DNA sequences from multiple loci. The study included 35 isolates from cool-temperate forest soils, seven known P. intermedium isolates, and six known Pythium attrantheridium isolates. We also performed morphological observations and mating tests. Our results showed that all the isolates formed one large clade but were divided into three subclades. Furthermore, we observed many mating reactions between isolates from different subclades, including between P. attrantheridium and P. intermedium. Therefore, we suggest that P. intermedium, P. attrantheridium, and another phylogenetic species belong to one species complex. This is the first report of a species complex within P. intermedium and will be helpful in understanding the evolution of Pythium species in natural ecosystems.



中文翻译:

Pythium intermedium,一种由在冷温带森林生态系统中发现的三种系统发育物种组成的物种复合体

中间腐霉在冷温带森林的碳循环中起着至关重要的作用,广泛分布于日本的森林土壤中。在这项研究中,我们使用来自多个基因座的 DNA 序列对中间假单胞菌物种复合体进行了系统发育分析。该研究包括来自冷温带森林土壤的 35 个分离株、7 个已知的P. intermedium分离株和 6 个已知的Pythium attrantheridium分离株。我们还进行了形态观察和交配测试。我们的结果表明,所有的分离株都形成了一个大进化枝,但又分为三个亚进化枝。此外,我们观察到来自不同亚群的分离株之间的许多交配反应,包括P. attrantheridiumP. 中间体。因此,我们认为P. intermediumP. attrantheridium和另一个系统发育物种属于一个物种复合体。这是关于P. intermedium中物种复合体的第一份报告,将有助于了解腐霉物种在自然生态系统中的进化。

更新日期:2021-07-17
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