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Distribution ofFrankia in soils from forest and afforestation sites in northern Sweden
Authors:Kerstin Huss-Danell  Ann-Kristin Frej
Institution:(1) Department of Plant Physiology, University of Umeå, S-901 87 Umeå, Sweden;(2) Department of Microbiology, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden;(3) Present address: Pharmacia Fine Chemicals AB, S-75182 Uppsala, Sweden
Abstract:Summary The presence in soil ofFrankia, capable of forming nitrogen-fixing root nodules onAlnus incana (L.) Moench, was investigated. Intact soil cores from forested as well as disturbed sites were sampled and both alder-rich and alder-free sites were included in the study. Surface-sterilized alder seeds were sown in the soil cores which were kept in sterile culture tubes in a growth chamber. Root nodules with nitrogenase activity developed in soil cores from all sites studied. Thus, infective and effectiveFrankia was present in all of the soils sampled, even from sites free from actinorhizal plants and irrespective of pH and nitrogen content of the soils.
Keywords:Afforestation  Alnus incana  Frankia  Free-living  Host plant dependency  N2-fixation  Nodulation  Pine forest  Podzol  Symbiosis
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