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Grouping of Frankia strains on the basis of susceptibility to antibiotics, pigment production and host specificity

SVETLANA V. DOBRITSA^,1,2

¹Department All-Russian Collection of Microorganisms, Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pushchino, Moscow Region, 142292, Russia

²Tel: +7 96 773 26 84. Fax: +7 95 923 36 02. e-mail: dobritsat{at}ibpm.serpukhov.su

ABSTRACT

Thirty-nine selected Frankia strains belonging to different genomic species were clustered on the basis of their in vitro susceptibility to 17 antibiotics, pigment production and ability to nodulate plants of the genus Alnus and/or the family Elaeagnaceae, or the family Casuarinaceae. The majority of the strains studied fell into three cluster groups. A, E and C, corresponding to the three host-specificity groups, Alnus, Elaeagnus and Casuarina. Within the groups, eight composite clusters, consisting of at least two strains, and five single-member clusters were recovered at the 0·74 distance level, in good agreement with levels of genetic relatedness between the strains. In addition, five strains were recovered as single-member clusters not in the cluster groups, four of them representing single-member genospecies and one strain not assigned to any known genospecies. The concordance between the phenotypic clusters and the genospecies described previously shows that the grouping may reflect the taxonomic structure of the genus Frankia. For some clusters, differentiating phenotypic characters were found which may be useful for species definition.

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