Nodulation competitiveness of Ensifer meliloti alfalfa nodule isolates and their potential for application as inoculants

• Autorzy: Marek-Kozaczuk M. , Wielbo J. , Pawlik A. , Skorupska A.
• Języki publikacji: EN

Abstrakty

EN

Alfalfa (Medicago sativa) is a widely cultivated legume, which enters into nitrogen-fixing symbiosis with Ensifer (Sinorhizobium) spp. In this study, an autochthonous rhizobial population of Ensifer sp. occupying alfalfa nodules grown in arable soil was used as the basis for selection of potential inoculants. Alfalfa nodule isolates were identified as Ensifer meliloti by partial 16S rDNA, recA, atpD and nodC nucleotide sequencing. The sampled isolates displayed different symbiotic performance and diversity in the number of plasmids and molecular weight. Isolates that were the most efficient in symbiotic nitrogen fixation were tagged with a constitutively expressed gusA gene carried by a stable plasmid vector pJBA21Tc and used in competition experiments in soil under greenhouse conditions. Two E. meliloti strains LU09 and LU12, which effectively competed with indigenous soil rhizobia, were selected. The metabolic profiles of these selected strains showed differences in the use of carbon and energy sources. In addition, the LU09 strain exhibited bacteriocin production and LU12 mineral phosphate solubilization, which are valuable traits for soil survival. These strains may be considered as potential biofertilizers for alfalfa cultivation.

• Wydawca: -
• Czasopismo: Polish Journal of Microbiology
• Rocznik: 2014
• Tom: 63
• Numer: 4
• Opis fizyczny: p.375–386,fig.,ref.

Twórcy

autor

Marek-Kozaczuk M.

• Department of Genetics and Microbiology, University of M.Curie-Sklodowska, Lublin, Poland

autor

Wielbo J.

• Department of Genetics and Microbiology, University of M.Curie-Sklodowska, Lublin, Poland

autor

Pawlik A.

• Department of Biochemistry, University of M.Curie-Sklodowska, Lublin, Poland

autor

Skorupska A.

• Department of Genetics and Microbiology, University of M.Curie-Sklodowska, Lublin, Poland

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