Abstract
Background and aims
Arbuscular (AM) and ectomycorrhizas (EM) predominate in different soils. We hypothesise that also climatic factors affect directly their relative success and AM fungi (AMF) generally tolerate drought better than EM fungi (EMF). Here we tested the colonisation rates of soil-borne AMF and EMF after soil drought treatments.
Methods
Forest and meadow soils were mixed to include AMF and EMF propagules. There were three soil treatments: soil moisture corresponding to 60% (control) or 10% in mass of maximum water retention, or air-dry. The bait plants were EM-forming silver birch (Betula pendula), dual-mycorrhiza forming grey alder (Alnus incana) and AM-forming white clover (Trifolium repens). After re-watering, bait plants were sown and grown in a growth chamber in favourable conditions. This way, host-plant responses to drought were eliminated.
Results
Previous soil drought decreased EM colonisation in alder. The spore formation by AMF in clover was negatively affected after the most severe soil drought treatment, suggesting slightly retarded AM formation. Soluble soil potassium concentrations were lower in drought-treated soils and this was reflected in birch foliar concentrations.
Conclusions
The results provide some support to the hypothesised better drought tolerance of AMF than EMF propagules but further studies in milder drought and in other plant-fungus combinations are needed.
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Acknowledgements
Thanks go to the Academy of Finland for funding (grant number 268279), to Marja-Leena Jalkanen, Leena Kuusisto, Arja Tervahauta and Juha Vattulainen for laboratory analyses and to Taslima Begum for help in the measurements.
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Kilpeläinen, J., Barbero-López, A., Vestberg, M. et al. Does severe soil drought have after-effects on arbuscular and ectomycorrhizal root colonisation and plant nutrition?. Plant Soil 418, 377–386 (2017). https://doi.org/10.1007/s11104-017-3308-8
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DOI: https://doi.org/10.1007/s11104-017-3308-8