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Depauperate soil fungal populations from the St. Helena endemic Commidendrum robustum are dominated by Capnodiales
Fungal Ecology ( IF 2.9 ) Pub Date : 2020-02-19 , DOI: 10.1016/j.funeco.2020.100911
A.P. Detheridge , S. Cherrett , L.A. Clasen , K. Medcalf , S. Pike , G.W. Griffith , J. Scullion

The island of St Helena is small and over 1900 km from the nearest continental landmass. A unique flora, including five endemic genera of Asteraceae, developed on the island. Plant communities have changed radically since ca. 1550, with deforestation and introduction of continental species leading to extinctions and large reductions in the range and abundance of endemic species. One of these species, Commidendrum robustum, an arborescent Asteraceae, persists in small relict populations where coverage has been continual, and is now the subject of a restoration programme. Here we analysed the fungal community, via soil eDNA metabarcoding (ITS2 and LSU loci), to test if the relict populations of C. robustum harbour an indigenous fungal community and whether communities under plantations of different ages resemble those on relict sites. Plant communities were also analysed using eDNA metabarcoding (ITS2 locus). Fungal composition showed significant differences in C. robustum stands of different ages (PERMANOVA analysis). Fungi in C. robustum soils were unusual in having very low abundances of Basidiomycota and being dominated by Capnodiales, an order of Ascomycota more commonly inhabiting leaf surfaces. SIMPER analysis revealed the differences between sites to be mainly due to variations in the species of Capnodiales present. Capnodiales abundance was linked to soil organic content. Fungal communities were most closely related to ground flora and soil factors; the relative abundance of the introduced grass Ehrharta erecta, organic matter and pH significantly associated with fungal community structure. Arbuscular mycorrhizal fungi (AMF) were present at low levels and there was no correlation with C. robustum sequence abundance, rather a correlation with the abundance of Poales hosts.



中文翻译:

来自圣赫勒拿地方性强壮Commidendrumrobustum的腐烂土壤真菌种群主要由Cap藜科植物

圣赫勒拿岛(St Helena)岛很小,距离最近的大陆大陆有1900多公里。岛上形成了独特的植物群,其中包括菊科的五个特有属。自从大约 1550年,随着森林的砍伐和大陆物种的引入,导致灭绝,特有物种的范围和数量大量减少。这些物种之一,稳健的菊苣科,一直生活在覆盖范围连续的小型遗物种群中,现在是恢复计划的主题。在这里,我们通过土壤eDNA元条形码(ITS2和LSU基因座)分析了真菌群落,以测试是否有健壮梭菌的遗留种群包含一个土著真菌群落,以及不同年龄的人工林下的群落是否类似于遗留场所上的群落。还使用eDNA元条形码(ITS2基因座)分析了植物群落。真菌组合物显示显著差异C.粗壮代表不同年龄(PERMANOVA分析)。鲁棒梭菌中的真菌土壤中的担子菌丰度非常低,并以Cap虫纲(Capnodiales)为主导,这是一种不常见的子囊菌,通常生活在叶片表面。SIMPER分析表明,位点之间的差异主要归因于存在的Capnodiales物种的差异。no藜的丰度与土壤有机含量有关。真菌群落与地面植物区系和土壤因素关系最密切。引入的草Ehrharta erecta,有机质和pH的相对丰度与真菌群落结构显着相关。丛枝菌根真菌(AMF)含量低,与强壮梭菌序列的丰度没有关系,而与Poales寄主的丰度没有关系。

更新日期:2020-02-19
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