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The arbuscular mycorrhizal fungus Rhizophagus intraradices and other microbial groups affect plant species in a copper-contaminated post-mining soil.
Journal of Trace Elements in Medicine and Biology ( IF 3.5 ) Pub Date : 2020-06-20 , DOI: 10.1016/j.jtemb.2020.126594
Masoud M Ardestani 1 , Jan Frouz 1
Affiliation  

Background and aim

Arbuscular mycorrhizal fungi (AMF) have an important role in plant-microbe interactions. But, there are few studies in which the combined effect of AMF with a stress factor, such as the presence of a metal, on plant species were assessed. This study investigated the effect of arbuscular mycorrhizal (AM) fungus Rhizophagus intraradices and other soil microbial groups in the presence of copper on three plant species in a microcosm experiment.

Methods

Two grass species Poa compressa and Festuca rubra and one herb species Centaurea jacea were selected as model plants in a pot-design test in which soils were artificially contaminated with copper. Treatments were bacteria (control), saprophytic fungi, protists, and a combined treatment of saprophytic fungi and protists, all in the presence or absence of the AM fungal species. After sixty days, plants were harvested and the biomass of grass and herb species and microbial respiration were measured.

Results

The results showed almost equal above- and belowground plant biomass and microbial respiration in the treatments in the presence or absence of R. intraradices. The herb species C. jecea responded significantly to the soil inoculation with AM fungus, while grass species showed inconsistent patterns. Significant effect of AMF and copper and their interactions was observed on plant biomass when comparing contaminated vs. non-contaminated soils.

Conclusion

Strong effect of AMF on the biomass of herb species and slight changes in plant growth with the presence of this fungal species in copper-spiked test soils indicates the importance of mycorrhizal fungi compared to other soil microorganisms in our experimental microcosms.



中文翻译:

丛枝菌根真菌 Rhizophagus intraradices 和其他微生物群会影响受铜污染的采矿后土壤中的植物物种。

背景与目标

丛枝菌根真菌(AMF)在植物-微生物相互作用中具有重要作用。但是,很少有研究评估 AMF 与胁迫因素(例如金属的存在)对植物物种的综合影响。本研究在微观实验中研究了在铜存在下丛枝菌根 (AM) 真菌根瘤菌和其他土壤微生物群对三种植物物种的影响。

方法

在盆栽设计试验中,选择了两种草种Poa compressaFestuca rubra以及一种草本植物Centaurea jacea作为模型植物,其中土壤被铜人为污染。处理是细菌(对照)、腐生真菌、原生生物以及腐生真菌和原生生物的组合处理,所有这些都在 AM 真菌物种存在或不存在的情况下。六十天后,收获植物并测量草和草本物种的生物量以及微生物呼吸。

结果

结果表明,在存在或不存在R 的情况下,处理中地上和地下植物生物量和微生物呼吸几乎相等。内基。草本植物C. jecea对 AM 真菌的土壤接种反应显着,而草本植物则表现出不一致的模式。在比较受污染和未受污染的土壤时,观察到 AMF 和铜及其相互作用对植物生物量的显着影响。

结论

AMF 对草本植物生物量的强烈影响以及这种真菌物种在含铜测试土壤中存在的植物生长的轻微变化表明,与我们的实验微观世界中的其他土壤微生物相比,菌根真菌的重要性。

更新日期:2020-07-01
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