Plant and Soil

, Volume 104, Issue 1, pp 45–51 | Cite as

Root-nodules formation byPenicillium sp. onAlnus glutinosa andAlnus incana

  • A. Capellano
  • B. Dequatre
  • G. Valla
  • A. Moiroud


A non identified species ofPenicillium induced the formation of nodules on the root system of two species of alder (Alnus glutinosa and A.incana). These so-called myconodules looked like young actinorhizae. Namely only some cortical cells of the young transformed root were invaded by the mycelium. Plasmalemma of the host-cell surrounded the hyphae when they penetrated in the cell, but then the fungus colonized all the cell, the contents of which degenerated. In spite of this necrophytic relationships the plant showed no evident damage after the infection.

Key words

alnus Frankia infection penicillium root-nodules 



cytoplasma of the host-cell


electron-dense deposits


vascular bundles






cytoplasmic membrane of the hyphae


host-cell nucleus


hyphae cell wall


host-cell plasmalemma


host-cell wall


septal pore of hyphae


mother-root bearing nodules


vesicles ofFrankia


Woronin bodies


cortical zone of nodule


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Copyright information

© Martinus Nijhoff Publishers 1987

Authors and Affiliations

  • A. Capellano
    • 1
  • B. Dequatre
    • 1
  • G. Valla
    • 1
  • A. Moiroud
    • 1
  1. 1.Ecologie Microbienne U.A. 697 et Centre de Microscopie Electronique Appliquée à la Biologie et GéologieUniversité Claude Bernard LYON 1Villeurbanne CedexFrance

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