Hiding in a crowd-does diversity facilitate persistence of a low-quality fungal partner in the mycorrhizal symbiosis?
Hiding in a crowd-does diversity facilitate persistence of a low-quality fungal partner in the mycorrhizal symbiosis?
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DOI：
10.1007/s13199-012-0197-8
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发表时间：
2013-01-01
期刊：
影响因子：
2.5
通讯作者：
Kiers, E. Toby
中科院分区：
文献类型：
--
作者：
Hart, Miranda M.;Forsythe, Jennifer;Kiers, E. Toby
鉴于丛枝菌根（AM）真菌并不总是有益于它们的宿主植物，很难解释这种关系的进化持久性。我们测试了这样一个假设，即增加真菌或宿主的生物多样性允许AM真菌在宿主上持续存在，而在宿主上它几乎没有表现出任何益处。我们发现，这种真菌（与Plantago laceolata相关的Glomus custos的分离物）与某些真菌组合生长，通过mtLSU DNA丰度测量，提高了其成功率。增加植物物种丰富度促进了这种真菌的传播，孢子密度和真菌定殖;宿主物种丰富度的作用并不清楚，当看措施的根丰度。这些结果表明，多样性的AM共生，植物和真菌，可以促进低质量的真菌的持久性。通过存在于一个复杂的菌丝体网络中，对宿主几乎没有生长益处的真菌菌株有更好的机会在同一宿主上持续存在。这有可能促进在小空间尺度上选择异质AM真菌群落。
Given that arbuscular mycorrhizal (AM) fungi are not consistently beneficial to their host plants, it is difficult to explain the evolutionary persistence of this relationship. We tested the hypothesis that increasing either fungal or host biodiversity allows an AM fungus to persist on a host where it shows little benefit. We found that growing such a fungus (an isolate of Glomus custos associating with Plantago laceolata) in combination with certain fungi improved its success as measured by mtLSU DNA abundance. Increasing plant species richness facilitated the spread of this fungus as measured by spore density and fungal colonization; the role of host species richness was not as clear when looking at measures of root abundance. These results indicate that diversity in the AM symbiosis, both plant and fungal, can promote the persistence of low-quality fungi. By existing within a complex mycelial network fungal strains that show little growth benefit to their hosts have a better chance of persisting on that same host. This has the potential to promote selection for heterogeneous AM fungal communities on a small spatial scale.