Strain Identity of the Ectomycorrhizal Fungus Laccaria bicolor Is More Important than Richness in Regulating Plant and Fungal Performance under Nutrient Rich Conditions.
Strain Identity of the Ectomycorrhizal Fungus Laccaria bicolor Is More Important than Richness in Regulating Plant and Fungal Performance under Nutrient Rich Conditions.
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DOI：
10.3389/fmicb.2017.01874
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发表时间：
2017
影响因子：
5.2
通讯作者：
Johnson D
中科院分区：
文献类型：
--
作者：
Hazard C;Kruitbos L;Davidson H;Mbow FT;Taylor AFS;Johnson D
生物多样性对生产力的影响在生态位互补潜力较大时更可能表现出来。在土壤中，化学性质复杂的养分资源库应比化学性质简单的库提供更多的生态位互补机会。外生菌根（ECM）真菌基因型在养分获取性状上表现出很大的差异，是土壤生物多样性的关键组成部分。在这里，我们测试的假设，增加土壤养分的化学复杂性和形式将增强种内ECM多样性对宿主植物和真菌生产力的影响。在纯培养中，我们发现ECM真菌双色蜡蘑菌株在一系列无机和有机形式的营养物质上的生长存在很大差异。随后的实验研究了种内同一性和丰富性的影响，使用欧洲赤松（Pinus sylvestris）幼苗与不同菌株的L。在补充有无机或有机形式的氮和磷的基质上生长的双色植物。种内身份对植物生产力的影响，只发现在无机营养修正，而种内身份影响真菌生产力在两种营养处理的程度相似。总体而言，种内丰富度对植物和真菌生产力没有显着影响。我们的研究结果表明，土壤营养成分不强烈相互作用与ECM种内丰富度，至少在实验条件下，矿物质营养不受限制。在这些条件下，ECM真菌的种内特性在调节植物和真菌性能方面变得比丰富度更重要。
Effects of biodiversity on productivity are more likely to be expressed when there is greater potential for niche complementarity. In soil, chemically complex pools of nutrient resources should provide more opportunities for niche complementarity than chemically simple pools. Ectomycorrhizal (ECM) fungal genotypes can exhibit substantial variation in nutrient acquisition traits and are key components of soil biodiversity. Here, we tested the hypothesis that increasing the chemical complexity and forms of soil nutrients would enhance the effects of intraspecific ECM diversity on host plant and fungal productivity. In pure culture, we found substantial variation in growth of strains of the ECM fungus Laccaria bicolor on a range of inorganic and organic forms of nutrients. Subsequent experiments examined the effects of intraspecific identity and richness using Scots pine (Pinus sylvestris) seedlings colonized with different strains of L. bicolor growing on substrates supplemented with either inorganic or organic forms of nitrogen and phosphorus. Intraspecific identity effects on plant productivity were only found under the inorganic nutrient amendment, whereas intraspecific identity affected fungal productivity to a similar extent under both nutrient treatments. Overall, there were no significant effects of intraspecific richness on plant and fungal productivity. Our findings suggest soil nutrient composition does not interact strongly with ECM intraspecific richness, at least under experimental conditions where mineral nutrients were not limiting. Under these conditions, intraspecific identity of ECM fungi becomes more important than richness in modulating plant and fungal performance.