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Untangling the effect of roots and mutualistic ectomycorrhizal fungi on soil metabolite profiles under ambient and elevated carbon dioxide
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2020-09-30 , DOI: 10.1016/j.soilbio.2020.108021
Johanna Wong-Bajracharya , Laura Castañeda-Gómez , Krista L. Plett , Ian C. Anderson , Yolima Carrillo , Jonathan M. Plett

Metabolites in soil play an important role in regulating plant-microbe interactions and, thereby, plant performance. Biotic factors such as root exudation and microbial activity or abiotic factors such as the concentration of atmospheric carbon dioxide (CO2) can drive both quantitative and qualitative changes in soil metabolite profiles. While the impact of these factors, either in isolation or in combination, are underexplored in soil systems due to technical challenges, recent technological advances have enabled these hurdles to be overcome. Given the key role that mutualistic ectomycorrhizal (ECM) fungi play in forest soils through their symbiotic interaction with trees, and the foreseen changes in forest dynamics with climate change, we investigated the effect of the Eucalyptus grandis-Pisolithus albus (plant host-fungus) association on soil metabolite profiles under ambient and elevated CO2 conditions (aCO2 and eCO2). We found that significant metabolite enrichment predominately occurred in the rhizosphere where a strong effect by ECM fungus was also observed. Specific ECM fungus-induced metabolites were enriched concurrently with an increased host plant root:shoot ratio, suggesting that the influence of ECM fungus on rhizosphere metabolite profiles may impact plant growth. Strikingly, however, we found no observable differences in soil metabolite profiles between the aCO2 and eCO2 conditions, which may be due to nutrient limitation given the low level of nutrients found in typical eucalyptus forest soils. Overall, our findings increase our understanding of soil metabolic processes at the symbiotic plant-microbe interface under current and future atmospheric CO2 scenarios.



中文翻译:

在环境和二氧化碳升高的情况下,弄清根系和互生的外生菌根真菌对土壤代谢物谱的影响

土壤中的代谢物在调节植物与微生物的相互作用,从而调节植物的性能中起着重要的作用。诸如根系分泌物和微生物活性之类的生物因素,或诸如大气中二氧化碳(CO 2)浓度之类的非生物因素,既可以驱动土壤代谢产物的定量变化,也可以驱动质量变化。尽管由于技术挑战,这些因素的影响(无论是单独还是组合)在土壤系统中的研究还不足,但最近的技术进步已克服了这些障碍。鉴于互生菌根真菌(ECM)真菌通过与树木的共生相互作用在森林土壤中发挥的关键作用,以及森林动态随气候变化的可预见变化,我们研究了桉树的作用-在环境和升高的CO 2条件(aCO 2和eCO 2)下,土壤中的代谢物剖面上的Pisolithus albus(植物寄主-真菌)关联。我们发现重要的代谢物富集主要发生在根际中,在那里也观察到了ECM真菌的强烈作用。特定的ECM真菌诱导的代谢产物同时富集,同时寄主植物根:茎比增加,这表明ECM真菌对根际代谢产物的影响可能会影响植物的生长。然而,令人惊讶的是,我们发现aCO 2和eCO 2之间的土壤代谢产物特征没有可观察到的差异。这种情况可能是由于养分限制所致,因为典型的桉树林土壤中养分含量较低。总体而言,我们的发现加深了我们对当前和未来大气CO 2情景下共生植物-微生物界面土壤代谢过程的了解。

更新日期:2020-09-30
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