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  • Title: Robust biological nitrogen fixation in a model grass-bacterial association.
    Author: Pankievicz VC, do Amaral FP, Santos KF, Agtuca B, Xu Y, Schueller MJ, Arisi AC, Steffens MB, de Souza EM, Pedrosa FO, Stacey G, Ferrieri RA.
    Journal: Plant J; 2015 Mar; 81(6):907-19. PubMed ID: 25645593.
    Abstract:
    Nitrogen-fixing rhizobacteria can promote plant growth; however, it is controversial whether biological nitrogen fixation (BNF) from associative interaction contributes to growth promotion. The roots of Setaria viridis, a model C4 grass, were effectively colonized by bacterial inoculants resulting in a significant enhancement of growth. Nitrogen-13 tracer studies provided direct evidence for tracer uptake by the host plant and incorporation into protein. Indeed, plants showed robust growth under nitrogen-limiting conditions when inoculated with an ammonium-excreting strain of Azospirillum brasilense. (11)C-labeling experiments showed that patterns in central carbon metabolism and resource allocation exhibited by nitrogen-starved plants were largely reversed by bacterial inoculation, such that they resembled plants grown under nitrogen-sufficient conditions. Adoption of S. viridis as a model should promote research into the mechanisms of associative nitrogen fixation with the ultimate goal of greater adoption of BNF for sustainable crop production.
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