Graffenrieda emarginata (Melastomataceae) forms mycorrhizas with Glomeromycota and with a member of the Hymenoscyphus ericae aggregate in the organic soil of a neotropical mountain rain forest
Graffenrieda emarginata (Melastomataceae) forms mycorrhizas with Glomeromycota and with a member of the Hymenoscyphus ericae aggregate in the organic soil of a neotropical mountain rain forest
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DOI：
10.1139/b03-153
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发表时间：
2004-03-01
期刊：
影响因子：
--
通讯作者：
Kottke, I
中科院分区：
文献类型：
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作者：
Haug, I;Lempe, J;Kottke, I
Graffenrieda emarginata (Ruiz & Pav.) Triana（野牡丹科）被发现是厄瓜多尔南部物种丰富的热带山地雨林中营养贫乏的有机土壤上最常见的树木。我们的研究表明，细根与丛枝菌根真菌共生，同时形成外切菌根，显示表面哈蒂格网，但没有菌丝套。分子系统发育揭示了许多以前未知的肾小球菌序列类型。形成外生菌根的真菌的超微结构表明存在子囊菌，分子系统发育研究将这种真菌共生体鉴定为 Hymenoscy phus ericae（阅读）Korf & Kernan 聚合体（子囊菌门）中的一个新分类单元。 G. emarginata 的菌根状态被认为对其在这些地点的竞争力和丰度至关重要。
Graffenrieda emarginata (Ruiz & Pav.) Triana (Melastomataceae) was found to be the most frequent tree on the nutrient-poor organic soil in a species-rich tropical mountain rain forest of southern Ecuador. Our studies revealed that the rootlets are symbiotically associated with arbuscular mycorrhizal fungi and simultaneously form ectomy corrhizas displaying a superficial Hartig net but no hyphal mantle. Molecular phylogeny revealed a multitude of previously unknown glomeromycete sequence types. Ultrastructure of the ectomycorrhiza-forming fungus indicated an ascomycete, and molecular phylogenetic studies identified the fungal symbiont as a new taxon within the Hymenoscy phus ericae (Read) Korf & Kernan aggregate (Ascomycota). The mycorrhizal state of G. emarginata is considered crucial for its competitiveness and abundance in these sites.