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Bradyrhizobium canariense and Bradyrhizobium japonicum are the two dominant rhizobium species in root nodules of lupin and serradella plants growing in Europe



Bradyrhizobium canariense and Bradyrhizobium japonicum are the two dominant rhizobium species in root nodules of lupin and serradella plants growing in Europe



Systematic and Applied Microbiology 34(5): 368-375



Forty three Bradyrhizobium strains isolated in Poland from root nodules of lupin species (Lupinus albus, L. angustifolius and L. luteus), and pink serradella (Ornithopus sativus) were examined based on phylogenetic analyses of three housekeeping (atpD, glnII and recA) and nodulation (nodA) gene sequences. Additionally, seven strains originating from root-nodules of yellow serradella (O. compressus) from Asinara Island (Italy) were included in this study. Phylogenetic trees revealed that 15 serradella strains, including all yellow serradella isolates, and six lupin strains grouped in Bradyrhizobium canariense (BC) clade, whereas eight strains from pink serradella and 15 lupin strains were assigned to Bradyrhizobium japonicum (BJ1). Apparently, these species are the two dominant groups in soils of central Europe, in the nodules of lupin and serradella plants. Only three strains belonged to other chromosomal lineages: one formed a cluster that was sister to B. canariense, one strain grouped outside the branch formed by B. japonicum super-group, and one strain occupied a distant position in the genus Bradyrhizobium, clustering with strains of the Rhodopseudomonas genus. All strains in nodulation nodA gene tree grouped in a cluster referred to as Clade II, which is in line with earlier data on this clade dominance among Bradyrhizobium strains in Europe. The nodA tree revealed four well-supported subgroups within Clade II (II.1-II.4). Interestingly, all B. canariense strains clustered in subgroup II.1 whereas B. japonicum strains dominated subgroups II.2-II.4.

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Accession: 036071900

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PMID: 21514760

DOI: 10.1016/j.syapm.2011.03.002


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