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首页> 外文期刊>Ecology letters >Preferential allocation to beneficial symbiont with spatial structure maintains mycorrhizal mutualism
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Preferential allocation to beneficial symbiont with spatial structure maintains mycorrhizal mutualism

机译：优先分配具有空间结构的有益共生体可保持菌根互生

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摘要

Mutualisms, beneficial interactions between species, are expected to be unstable because delivery of benefit likely involves fitness costs and selection should favour partners that deliver less benefit. Yet, mutualisms are common and persistent, even in the largely promiscuous associations between plants and soil microorganisms such as arbuscular mycorrhizal fungi. In two different systems, we demonstrate preferential allocation of photosynthate by host plants to the more beneficial of two AM fungal symbionts. This preferential allocation could allow the persistence of the mutualism if it confers sufficient advantage to the beneficial symbiont that it overcomes the cost of mutualism. We find that the beneficial fungus does increase in biomass when the fungi are spatially separated within the root system. However, in well-mixed fungal communities, non-beneficial fungi proliferate as expected from their reduced cost of mutualism. Our findings suggest that preferential allocation within spatially structured microbial communities can stabilize mutualisms between plants and root symbionts.
机译：互惠关系（物种之间的有益相互作用）预计会不稳定，因为利益的交付可能涉及适应性成本，而选择应该偏向利益较少的合作伙伴。然而，即使在植物与土壤微生物（如丛枝菌根真菌）之间的大部分混杂关系中，共生也是普遍且持久的。在两个不同的系统中，我们证明了宿主植物对光合产物的优先分配对两个AM真菌共生菌更有利。如果这种优先分配给互惠共生者带来了克服互惠成本的充分优势，那么它就可以使互惠主义得以持久。我们发现，当真菌在根系内空间分隔时，有益真菌的生物量确实会增加。然而，在混合良好的真菌群落中，非受益性真菌如其互惠成本降低所预期的那样扩散。我们的发现表明，在空间结构化微生物群落内进行优先分配可以稳定植物与根共生体之间的共生关系。

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