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We isolated 18 rhizobial strains from root nodules of a leguminous shrub  Laburnum anagyroides  (common laburnum) grown in Southeast Poland as an exotic plant. With the use of BOX-PCR fingerprinting, the isolates were clustered into 2 main groups and one separate lineage, which was congruent with the ITS-RFLP results .  The phylogenetic trees constructed based on 16S rRNA and combined  atpD ,  dnaK ,  glnA , and  recA  gene sequence data separated the representative strains into three evolutionary lineages within the  Bradyrhizobium jicamae  supergroup, with  Bradyrhizobium algeriense  and  Bradyrhizobium valentinum  as the closest relatives. The  nodA  and  nifH  gene phylogenies proved that the  L. anagyroides  symbionts carry a symbiotic gene variant known as Clade IV, representing the symbiovar retamae. Phenotypic characteristics of the isolates and reference strains are also reported. Our study of the rhizobia nodulating  L. anagyroides  growing in Poland complements earlier few findings on the symbiotic associations of this Genisteae species.

Bradyrhizobia associated with Laburnum anagyroides, an exotic legume grown in Poland