Abstract
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 LMG28514T 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.
Highlights
Legumes (Fabaceae) are of great importance in different aspects, whether in agriculture, medicine, or ecology
Thirty-six bacterial cells were isolated from root nodules of L. cosentinii (20) and L. luteus (16) grown in Maamora cork oak forest soils
The REP PCR technique is employed for analysis of the genetic diversity of rhizobia (Laguerre et al, 1997; Menna et al, 2009)
Summary
Legumes (Fabaceae) are of great importance in different aspects, whether in agriculture, medicine, or ecology. Some species of this plant family can establish a specific symbiosis with rhizobia. A successful symbiotic interaction is based on a molecular dialogue between the two partners and generally involves rhizobial lipo-chitooligosaccharide signals called Nod factors (NF) (Wang et al, 2018; Lindström and Mousavi, 2020).
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