Trade-offs between arbuscular mycorrhizal fungal competitive ability and host growth promotion in Plantago lanceolata
Trade-offs between arbuscular mycorrhizal fungal competitive ability and host growth promotion in Plantago lanceolata
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DOI：
10.1007/s00442-009-1345-6
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发表时间：
2009-07-01
期刊：
影响因子：
2.7
通讯作者：
Bever, James D.
中科院分区：
文献类型：
--
作者：
Bennett, Alison Elizabeth;Bever, James D.
在这项研究中，我们测试了丛枝菌根(AM)真菌为宿主提供的好处与它们在宿主根中的竞争能力之间的权衡，以及这种潜在的权衡是否在植物胁迫(草食)的存在下发生变化。我们使用了三种AM真菌，它们与寄主植物相关，在促进寄主生长和产孢量方面存在差异。我们发现，这些AM真菌物种都在争夺根空间，而最好的竞争对手--轮生菌是最差的互惠共生体。此外，最糟糕的竞争对手Glomus White是最好的互惠互利者。竞争对真菌感染模式的影响强于草食性，竞争优势不受草食性的影响。我们在先前的AM真菌之间的竞争测试中发现了类似的模式，并讨论了这些结果对于AM真菌与其植物寄主之间的互惠和反馈的持久性的影响。
In this study we tested for trade-offs between the benefit arbuscular mycorrhizal (AM) fungi provide for hosts and their competitive ability in host roots, and whether this potential trade-off shifts in the presence of a plant stress (herbivory). We used three species of AM fungi previously determined to vary in host growth promotion and spore production in association with host plants. We found that these AM fungal species competed for root space, and the best competitor, Scutellospora calospora, was the worst mutualist. In addition, the worst competitor, Glomus white, was the best mutualist. Competition proved to have stronger effects on fungal infection patterns than herbivory, and competitive dominance was not altered by herbivory. We found a similar pattern in a previous test of competition among AM fungi, and we discuss the implications of these results for the persistence of the mutualism and feedbacks between AM fungi and their plant hosts.