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In this work, we analyzed the diversity of the nodule-forming bacteria associated with  Lupinus luteus  and  Lupinus cosentinii  grown in the Maamora Cork oak forest acidic soils in Morocco. The phenotypic analysis showed the high diversity of the strains nodulating the two lupine's species. The strains were not tolerant to acidity or high alkalinity. They do not tolerate salinity or high temperatures either. The strains isolated from  L. luteus  were more tolerant to antibiotics and salinity than those isolated from  L. cosentinii . The plant growth promoting (PGP) activities of our strains are modest, as among the 28 tested isolates, only six produced auxins, six produced siderophores, whereas three solubilized phosphates. Only two strains possess the three activities. The rrs gene sequences from eight representative strains selected following ARDRA and REP-PCR results revealed that they were members of the genus  Bradyrhizobium. Six  strains were then retained for further molecular analysis. The  glnII, recA, gyrB, dnaK , and  rpoB  housekeeping gene sequence phylogeny showed that some strains were close to  B. lupini  LMG28514 T  whereas others may constitute new genospecies in the genus  Bradyrhizobium . The strains were unable to nodulate  Glycine max  and  Phaseolus vulgaris  and effectively nodulated  L. luteus, L. cosentinii, L. angustifolius, Chamaecytisus albidus , and  Retama monosperma . The  nodC  and  nodA  symbiotic gene phylogenies showed that the strains are members of the genistearum symbiovar.

Characterization of Bradyrhizobium spp. Nodulating Lupinus cosentinii and L. luteus Microsymbionts in Morocco