AI Article Synopsis
- Most plants have a symbiotic relationship with arbuscular mycorrhizal fungi (AMF), which help them absorb nutrients by extending their fungal networks in the soil.
- Research focused on understanding how other microorganisms might suppress these AMF networks in various natural soil ecosystems and used phosphorus uptake by the fungal networks as a measure of AMF activity.
- The study found that AMF suppression was more common in acidic soils, with specific bacterial and fungal communities linked to this suppressive effect, suggesting that the performance of AMF in natural environments is heavily influenced by certain soil microbes.
Article Abstract
Most plants form symbiotic associations with arbuscular mycorrhizal fungi (AMF). AMF increase the uptake of plant nutrients by extending their extra-radical mycelium (ERM) in the soil where other groups of microorganisms may suppress the activity of the ERM. However, little is known about such suppression in natural soils. This work aimed to investigate the incidence of AMF suppression among soils sampled from highly variable natural ecosystems, and used 33P uptake by the ERM to evaluate AMF activity. A second aim was to identify factors behind the observed AMF-suppression. We found that AMF-suppressiveness varied markedly among natural soils and occurred more frequently in low pH than in high pH soils. A previous study for cultivated soils revealed a strong biological component of suppressiveness against AMF, and in accordance we found that the composition of both fungal and bacterial communities differed significantly between AMF-suppressive and non-suppressive natural soils. Acidobacteria, Acidothermus, Xanthomonadaceae, Archaeorhizomyces sp., Mortierella humilis and some Mycena spp. were significantly more abundant in AMF-suppressive soils and may therefore be direct antagonists of AMF. This implies that the functioning of AMF in natural ecosystems is strongly modulated by specific soil microbes.
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| http://dx.doi.org/10.1093/femsec/fiz020 | DOI Listing |
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