We examined fungi associated with roots of isoetid plants collected from six Norwegian lakes. The composition of the diverse fungal communities was shaped mainly by host identity, while abiotic factors had negligible effects. The communities associated with roots of Subularia aquatica, Isoëtes echinospora and Isoëtes lacustris were dominated by Ascomycota, Chytridiomycota, and Basidiomycota while Glomeromycota were infrequent and the proportion of unidentified fungal taxa was relatively high. In contrast, Lobelia dortmanna and Littorella uniflora roots associated mainly with Glomeromycota, Ascomycota, and Basidiomycota. Chytridiomycota and unidentified fungi were rare. Glomeromycota comprised 39 phylotypes spanning nine families, with the second most abundant phylotype belonging to a yet undescribed sister lineage to the family Archaeosporaceae, repeatedly reported from aquatic environments. Our results indicate that fungal communities in roots of aquatic plants might be diverse as in terrestrial plants, and that they comprise a high proportion of yet undescribed taxa.

我们检查了与从六个挪威湖泊中收集的同种异体植物根系相关的真菌。不同真菌群落的组成主要由寄主身份决定，而非生物因素的影响可忽略不计。与基层相关的社区Subularia水生，水韭属棘和韭湖生由子囊菌门，壶菌为主，而担子是球囊菌门不常和不明真菌类群的比例相对较高。相比之下，山梗菜和独生小花根主要与Glomeromycota，Ascomycota和Basidiomycota相关。壶菌和不明真菌很少见。Glomeromycota包括横跨9个科的39种系统型，其中第二丰富的系统型属于古细菌科的一个尚未描述的姐妹谱系，在水生环境中屡次报道。我们的结果表明，水生植物根部的真菌群落可能与陆生植物中的真菌群落不同，并且它们构成了很大一部分尚未描述的分类单元。