Institute of Ecology and Earth Sciences, Tartu University, Tartu, Estonia.
Mycorrhiza. 2012 Nov;22(8):663-8. doi: 10.1007/s00572-012-0458-7. Epub 2012 Aug 15.
Majority of autotrophic plants and fungi associate with multiple mycorrhizal partners, with notable exceptions being Gnetum africanum, Pisonia grandis, and Alnus spp from the phytobiont perspective. We hypothesized that an understorey tree species Gnetum gnemon hosts a narrow range of mycobionts as shown in G. africanum and suggested for South American species. Sampling and molecular analysis of G. gnemon root tips revealed that besides Scleroderma spp. this gymnosperm tree associates with several fungal species from unrelated lineages. However, all Scleroderma isolates that associate with Gnetum spp. belong to a narrow clade close to Scleroderma sinnamariense. Our results demonstrate for the first time that specificity for mycobionts may substantially differ within an ectomycorrhizal plant genus.
从植物共生体的角度来看，大多数自养植物和真菌与多种菌根伙伴共生，但 Gnetum africanum、Pisonia grandis 和 Alnus spp 是明显的例外。我们假设，林下树种 Gnetum gnemon 拥有与 G. africanum 中所示的类似的狭窄菌根范围，并暗示南美物种也是如此。对 G. gnemon 根尖的采样和分子分析表明，除了 Scleroderma spp. 外，这种裸子植物还与来自不同谱系的几种真菌物种共生。然而，与 Gnetum spp. 共生的所有 Scleroderma 分离株都属于与 Scleroderma sinnamariense 密切相关的一个狭窄分支。我们的研究结果首次表明，在一个外生菌根植物属内，菌根伙伴的特异性可能有很大差异。
