Host preferences and differential contributions of deciduous tree species shape mycorrhizal species richness in a mixed Central European forest.
Host preferences and differential contributions of deciduous tree species shape mycorrhizal species richness in a mixed Central European forest.
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DOI：
10.1007/s00572-010-0338-y
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发表时间：
2011-05
期刊：
影响因子：
3.9
通讯作者：
Polle, Andrea
中科院分区：
文献类型：
--
作者：
Lang, Christa;Seven, Jasmin;Polle, Andrea
在由水青冈 (Fagus sylvatica)、椴树 (Tilia spp.)、鹅耳枥 (Carpinus betulus)、宏碁 (Acer spp.) 和白蜡树 (Fraxinus excelsior) 组成的混合落叶林中调查了菌根物种丰富度和寄主范围。宏碁和白蜡树被丛枝菌根定植，占总林分菌根真菌物种丰富度的 5%。与水青冈属（75 个推定类群）相比，椴树拥有类似的外生菌根 (EM) 真菌类群，而鹅耳椴属的数量只有一半。寄主树EM真菌丰富度的相对丰度按水青冈属 > 椴树属 >> Carpinus的顺序递减。经过类似采样强度的校正后，Carpinus 的 EM 真菌物种丰富度仍比 Fagus 和 Tilia 低约 30-40%。大约 10% 的菌根物种在 EM 形成树中共享； 29% 与两种寄主树种相关，61% 与其中一种寄主树种相关。后者主要由罕见的 EM 真菌物种组成，占据了约 20% 的根尖，其中包括已知的专家，但也包括推定的非寄主群，如针叶树或灌木菌根。我们的数据表明，EM 真菌物种丰富度与树木特性相关，并表明水青冈确保了生态系统中的 EM 真菌多样性，因为它与椴树和鹅耳楸属相比，与后两者共享更多常见的 EM 真菌。本文的在线版本 (doi:10.1007/s00572-010-0338-y) 包含补充材料，可供授权用户使用。
Mycorrhizal species richness and host ranges were investigated in mixed deciduous stands composed of Fagus sylvatica, Tilia spp., Carpinus betulus, Acer spp., and Fraxinus excelsior. Acer and Fraxinus were colonized by arbuscular mycorrhizas and contributed 5% to total stand mycorrhizal fungal species richness. Tilia hosted similar and Carpinus half the number of ectomycorrhizal (EM) fungal taxa compared with Fagus (75 putative taxa). The relative abundance of the host tree the EM fungal richness decreased in the order Fagus > Tilia >> Carpinus. After correction for similar sampling intensities, EM fungal species richness of Carpinus was still about 30–40% lower than that of Fagus and Tilia. About 10% of the mycorrhizal species were shared among the EM forming trees; 29% were associated with two host tree species and 61% with only one of the hosts. The latter group consisted mainly of rare EM fungal species colonizing about 20% of the root tips and included known specialists but also putative non-host associations such as conifer or shrub mycorrhizas. Our data indicate that EM fungal species richness was associated with tree identity and suggest that Fagus secures EM fungal diversity in an ecosystem since it shared more common EM fungi with Tilia and Carpinus than the latter two among each other. The online version of this article (doi:10.1007/s00572-010-0338-y) contains supplementary material, which is available to authorized users.
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