Diversity and specificity of Frankia strains in nodules of sympatric Myrica gale, Alnus incanca, and Shepherdia canadensis determiend by rrs gene polymorphism

Article Abstract:

The actinorhizal plants Myrica gale, Alnus incana, and Shepherdia canadensis have diverse strains of the nitrogen-fixing actinomycete Frankia even when grown in close proximity to each other. Soil moisture and organic content may affect the distribution of Frankia in addition to host selectivity and geographic separation.

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Evidence that some Frankia sp. strains are able to cross boundaries between Alnus and Elaeagnus host specificity groups

Article Abstract:

Four strains of Frankia isolated from an Elaeagnus hybrid were found to induce nodule formation in axenically grown Alnus incana and Alnus glutinosa. Microscopic examination showed that these strains entered via deformed root hairs. The four strains were reisolated from infected Alnus plantlets to fulfill Koch's postulates. The identity of the reisolated strains were further confirmed by DNA hybridization of Alnus- and Eleagnus- specific probes, as well as by restriction enyzme analysis and 16S rDNA sequencing.

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Genetic diversity among Frankia strains nodulating members of the family Casuarinaceae in Australia revealed by PCR and restriction fragment length polymorphism analysis with crushed root nodules

Article Abstract:

A study was conducted to investigate the genetic diversity which may occur among Frankia strains nodulating native populations of Casuarina and Allocasuarina species in northeastern Australia. DNA was extracted directly from nodules and amplified by polymerase chain reaction to examine phylogenetic relationships. Genetic diversity was clearly observed among the Frankia strains. A significant discovery was the apparent host specificity in unisolated nodules collected from the Casuarina and Allocasuarina species.

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