Abstract
Abstract Mobilization of non‐exchangeable ammonium (NH $ _4^+ $ ) by hyphae of the vesicular‐arbuscular mycorrhizal (VAM) fungus Glumus mosseae was studied under controlled experimental conditions. Maize ( Zea mays ) and parsley ( Petroselinum sativum ) were grown either alone or in symbiosis with Glomus mosseae in containers with separated compartments for roots and hyphal growth. In one experiment, 15 NH $ _4^+ $ was added to the soil to differentiate between the native non‐exchangeable NH $ _4^+ $ and the non‐exchangeable NH $ _4^+ $ derived from N fertilization. Non‐exchangeable NH $ _4^+ $ was mobilized by plant growth. Plant dry weight and N uptake, however, were not significantly influenced by mycorrhizal colonization of the roots. The influence of root infection with mycorrhizal fungus on the mobilization of non‐exchangeable NH $ _4^+ $ was negligible. In the hyphal compartment, hyphal uptake of N resulted in a decrease of NH $ _4^+ $ in the soil solution and of exchangeable NH $ _4^+ $ . However, the NH $ _4^+ $ concentration was still too high to permit the release of non‐exchangeable NH $ _4^+ $ . The results demonstrate that, in contrast to roots, hyphae of VAM fungi are not able to form a non‐exchangeable‐NH $ _4^+ $ depletion zone in the adjacent soil. However, under conditions of a more substantial depletion of the exchangeable NH $ _4^+ $ in the mycorrhizal sphere ( e.g. , with longer growth), an effect of mycorrhiza on the non‐exchangeable NH $ _4^+ $ might be found.
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Claims 5
Claim · model-written summary
Plant growth mobilized non-exchangeable ammonium.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non‐exchangeable NH $ _4^+ $ was mobilized by plant growth”
e1“Maize ( Zea mays ) and parsley ( Petroselinum sativum )”
Claim · model-written summary
Mycorrhizal colonization did not significantly affect plant dry weight or nitrogen uptake.
- Treatment
- mycorrhizal colonization of the rootse0
- Outcome
- Plant dry weight and N uptakee0
- Direction
- not significantly influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant dry weight and N uptake, however, were not significantly influenced by mycorrhizal colonization of the roots”
e1“Maize ( Zea mays ) and parsley ( Petroselinum sativum )”
Claim · model-written summary
Mycorrhizal infection had negligible influence on non-exchangeable ammonium mobilization.
- Treatment
- root infection with mycorrhizal funguse0
- Outcome
- mobilization of non‐exchangeable NH $ _4^+ $e0
- Direction
- negligiblee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The influence of root infection with mycorrhizal fungus on the mobilization of non‐exchangeable NH $ _4^+ $ was negligible”
e1“Maize ( Zea mays ) and parsley ( Petroselinum sativum )”
Claim · model-written summary
Hyphal nitrogen uptake decreased soil solution and exchangeable ammonium.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hyphal uptake of N resulted in a decrease of NH $ _4^+ $ in the soil solution and of exchangeable NH $ _4^+ $”
e1“Maize ( Zea mays ) and parsley ( Petroselinum sativum )”
Claim · model-written summary
VAM fungal hyphae did not form a non-exchangeable ammonium depletion zone adjacent to soil.
Not reportedDirection
Verbatim
e0“hyphae of VAM fungi are not able to form a non‐exchangeable‐NH $ _4^+ $ depletion zone in the adjacent soil”
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