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Twelve single-spore isolates of the flexible Elaeagnus-Frankia strain UFI 132715 fulfilled the third and the fourth of Koch's postulates on both Alnus and Elaeagnus axenic plants. Seminested nifD-nifK PCR-restriction fragment length polymorphisms provided evidence for the genetic uniformity of the single-spore frankiae with the mother strain and its plant reisolates and allowed their molecular identification directly inside Alnus and Elaeagnus nodules. The clonal nature of these single-spore-purified frankiae should allow safe mutagenesis programs, while their flexible phenotype makes them a powerful tool for understanding the molecular interactions between Frankia strains and actinorhizal plants and for identifying Frankia nodulation genes.

PCR-restriction fragment length polymorphism identification and host range of single-spore isolates of the flexible Frankia sp. strain UFI 132715