AUTHOR=Missbah El Idrissi Mustapha , Bouhnik Omar , ElFaik Salma , Alami Soufiane , Lamin Hanane , Bedmar Eulogio J. , Abdelmoumen Hanaa 

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

JOURNAL=Frontiers in Agronomy

VOLUME=3

YEAR=2021

URL=https://www.frontiersin.org/journals/agronomy/articles/10.3389/fagro.2021.661295

DOI=10.3389/fagro.2021.661295

ISSN=2673-3218

ABSTRACT=<p>In this work, we analyzed the diversity of the nodule-forming bacteria associated with <italic>Lupinus luteus</italic> and <italic>Lupinus cosentinii</italic> 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 <italic>L. luteus</italic> were more tolerant to antibiotics and salinity than those isolated from <italic>L. cosentinii</italic>. 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 <italic>Bradyrhizobium. Six</italic> strains were then retained for further molecular analysis. The <italic>glnII, recA, gyrB, dnaK</italic>, and <italic>rpoB</italic> housekeeping gene sequence phylogeny showed that some strains were close to <italic>B. lupini</italic> LMG28514<sup>T</sup> whereas others may constitute new genospecies in the genus <italic>Bradyrhizobium</italic>. The strains were unable to nodulate <italic>Glycine max</italic> and <italic>Phaseolus vulgaris</italic> and effectively nodulated <italic>L. luteus, L. cosentinii, L. angustifolius, Chamaecytisus albidus</italic>, and <italic>Retama monosperma</italic>. The <italic>nodC</italic> and <italic>nodA</italic> symbiotic gene phylogenies showed that the strains are members of the genistearum symbiovar.</p>