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    • Keywords

       

      Alnus; Elaeagnus; Frankia; Hippophae; Micromonospora; Myrica

    • Abstract

       

      Actinorhizal plants have been found in eight genera belonging to three orders (Fagales, Rosales and Cucurbitales). These all bear root nodules inhabited by bacteria identified as the nitrogen-fixing actinobacterium Frankia. These nodules all have a peripheral cortex with enlarged cells filled with Frankia hyphae and vesicles. Isolation in pure culture has been notoriously difficult, due in a large part to the growth of fast-growing contaminants where, it was later found, Frankia was slow-growing.

      Many of these contaminants, which were later found to be Micromonospora, were obtained from Casuarina and Coriaria. Our study was aimed at determining if Micromonospora were also present in other actinorhizal plants. Nodules from Alnus glutinosa, Alnus viridis, Coriaria myrtifolia, Elaeagnus x ebbingei, Hippophae rhamnoides, Myrica gale and Morella pensylvanica were tested and were all found to contain Micromonospora isolates. These were found to belong to mainly three species: Micromonospora lupini, Micromonospora coriariae and Micromonospora saelicesensis.

      Micromonospora isolates were found to inhibit some Frankia strains and to be innocuous to other strains.

    • Author Affiliations

       

      Lorena Carro1 Petar Pujic1 Martha E Trujillo2 Phillipe Normand1

      1. Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne UMR5557, Villeurbanne 69622 Cedex, France
      2. Departamento de Microbiologıa y Genetica, Edificio Departamental, Lab. 214, Campus Miguel de Unamuno, Universidad de Salamanca, 37007 Salamanca, Spain
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