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首页> 外文期刊>Plant and Soil >Neighboring plant influences on arbuscular mycorrhizal fungal community composition as assessed by T-RFLP analysis
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Neighboring plant influences on arbuscular mycorrhizal fungal community composition as assessed by T-RFLP analysis

机译：通过T-RFLP分析评估相邻植物对丛枝菌根真菌群落组成的影响

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摘要

Controls on root colonization by arbuscular mycorrhizal fungi (AMF) include host nutrient status, identity of symbionts and soil physico-chemical properties. Here we show, in the field, that the subset of the AMF community colonizing the roots of a common grass species, Dactylis glomerata, was strongly controlled by neighboring roots of a different plant species, Centaurea maculosa, an invasive forb, thus adding a biological spatial component to controls on root colonization. Using an AMF-specific, 18s rDNA-based terminal restriction fragment length polymorphism (T-RFLP) analysis method, significant differences were found between AMF community fingerprints of samples derived from roots of grasses with (GCm) and without (G0) neighboring C. maculosa. There were also significant differences between samples derived from C. maculosa roots (Cmac) and both G Cm and G0 roots. Sample ordination indicated three generally distinct groups consisting of Cmac, GCm and G0, with G Cm samples being of intermediate distance between G0and C mac . Our results indicate that, with the presence of C. maculosa, AMF communities of D. glomerata shift to reflect community composition associated with C. maculosa roots. These results highlight the importance of complex spatial distributions of AMF communities at the scale of a root system. An additional dimension to our study is that C. maculosa is an aggressively invasive plant in the intermountain West. Viewed in this light, these results suggest that pervasive influences of this plant on AMF communities, specifically in roots of its competitors, may represent a mechanism contributing to its invasive success. However, further work is clearly required to determine the extent to which AMF genotypic alteration by neighboring plants influences competitive relationships.
机译：丛枝菌根真菌（AMF）对根部定植的控制包括寄主营养状况，共生体的身份和土壤理化性质。在这里，我们表明，在田间，定植在常见草种Dactylis glomerata根部的AMF群落的子集受到另一种植物入侵种Centaurea maculosa的邻近根的强烈控制，从而增加了生物控制根部定植的空间成分。使用基于AMF的，基于18s rDNA的末端限制性片段长度多态性（T-RFLP）分析方法，发现了带有（GCm ）和不带有（G0）的草根样品的AMF群落指纹之间的显着差异）。在来自Mac。Maculosa根（Cmac ）和G Cm 和G0 根的样品之间也存在显着差异。样本排序指示了Cmac ，GCm 和G0 三个大致不同的组，其中G Cm 样本的距离介于G0 和C mac 。我们的研究结果表明，在存在斑纹线虫的情况下，D。glomerata的AMF群落发生变化，以反映与斑纹线虫根相关的群落组成。这些结果凸显了AMF社区在根系规模上复杂的空间分布的重要性。我们研究的另一个方面是，斑节对虾是山间西部的一种侵略性入侵植物。从这个角度来看，这些结果表明该植物对AMF群落的普遍影响，特别是其竞争者的根源，可能代表了其入侵成功的机制。但是，显然需要进一步的工作来确定邻近植物的AMF基因型改变对竞争关系的影响程度。

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