Plant and Soil

, Volume 96, Issue 2, pp 205–213 | Cite as

Distribution of spore-positive and spore-negative nodules in stands ofAlnus glutinosa andAlnus incana in Finland

  • Assi Weber


The distribution of spore positive (Sp+) and spore negative (Sp) nodules on the two native alder species (A. incana andA. glutinosa) in Finland was investigated. Nodules were collected throughout the country from different ecosystems (forests, swamps, lake- sea- and riversides, old pastures and fields as well as from alder plantations).

OnA. incana Sp+ nodules predominated, whereas onA. glutinosa the vast majority of the nodules were of the Sp type. Sp+ nodules onA. glutinosa were found only at sites where the two alder species grew close together. This distribution pattern indicates an association of nodule type with alder species, the reasons for which are discussed. Indications of saprophytic growth in the Sp strain were also found.

Key words

Actinorhizal plants Alnus glutinosa Alnus incana Frankia Nitrogen fixation Nodules 


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Copyright information

© Martinus Nijhoff Publishers 1986

Authors and Affiliations

  • Assi Weber
    • 1
  1. 1.Department of General MicrobiologyUniversity of HelsinkiHelsinki 28Finland

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