Sanders Ian R
Department of Biology, University of York, Heslington, YO1 5DD, York, UK.
Oecologia. 1993 Mar;93(3):349-355. doi: 10.1007/BF00317877.
Specificity in vesicular-arbuscular mycorrhizas (VAM), arising from selection favouring host plant/mycorrhizal fungus associations in which both organisms receive benefit, might have a significant influence on interactions between co-existing plant species. In an attempt to detect such specificity root inoculum of four tempt to detect such specificity root inoculum of four plant species, harvested from a species-rich grassland on three dates during the plant growth season, was used to infect the same plant species grown in pots. The rate and overall level of infection was different according to inoculum source and the time of year in which the inoculum was harvested, i.e. temporal variation in VAM infectivity occurs. However, there was no evidence for either specificity or mycorrhizal benefit. Inoculum produced during this experiment was used to infect "bait" Trifolium pratense plants and protein patterns of these roots indicated that a number of biochemically different endophytes were present, both within the inoculum of the four plant species but also within inoculum from one plant species. Temporal variation in mycorrhizal infectivity could be important for mycorrhizal propagation in the field. However, the lack of evidence, in this study, for specificity of VAM or an obvious nutritional benefit to plants with mycorrhizas make the role of mycorrhizas in this community difficult to interpret.
泡囊-丛枝菌根（VAM）的特异性源于对宿主植物/菌根真菌共生关系的选择，在这种共生关系中，两种生物都能受益，这可能对共存植物物种之间的相互作用产生重大影响。为了检测这种特异性，从植物生长季节的三个日期从物种丰富的草原采集的四种植物的根接种物，被用于感染盆栽中生长的相同植物物种。感染率和总体感染水平因接种物来源和接种物采集的年份不同而有所差异，即VAM感染力存在时间变化。然而，没有证据表明存在特异性或菌根益处。在本实验中产生的接种物被用于感染“诱饵”红车轴草植物，这些根的蛋白质模式表明，在四种植物物种的接种物中以及一种植物物种的接种物中都存在许多生化特性不同的内生菌。菌根感染力的时间变化对于田间菌根繁殖可能很重要。然而，在本研究中，缺乏VAM特异性或菌根对植物有明显营养益处的证据，使得菌根在这个群落中的作用难以解释。
