| Summary: | The occurrence of arbuscular mycorrhizal fungi (AMF) in cultivated soils of Poland was characterized based on 15-year investigations. Spores of AMF were isolated from both field-collected root-rhizosphere soil mixtures and trap cultures established with a part of these mixtures. The mixtures were collected from under 41 plant species. The plant species most frequently sampled were Hordeum vulgare, Triticum aestivum, and Zea mays. Spores of AMF were found in 97,5% of the field-collected root-soil samples and in 95,5% of trap cultures. The AMF predominating in populations of the spores revealed were members of the genus Glomus. The spores recovered belonged to 36 species. The AM fungal species most frequently occurring in cultivated soils of Poland were Glomus caledonium, G.constrictum, G.deserticola, and G.mosseae.
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