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Plant Growth Regulation

, Volume 61, Issue 2, pp 153–159 | Cite as

Symbiotic nitrogen fixation and nitrate reduction in two peanut cultivars with different growth habit and branching pattern structures

  • Romina Delfini
  • Cecilia Belgoff
  • Elena Fernández
  • Adriana Fabra
  • Stella Castro
Original paper

Abstract

We have investigated the response of two peanut cultivars (TEGUA and UTRE) with different growth habits and branching pattern structures to different nitrogen (N) sources, namely, N-fertilizer or N2 made available by symbiotic fixation, and analysed the pattern of nitrate reductase (NR) activity in these cultivars. Nitrate and amino acid contents were also examined under these growth conditions. In terms of nitrogen source, cv. TEGUA showed a better response to inoculation with Bradyrhizobium sp. SEMIA 6144 at 40 days after planting, while cv. UTRE responded better to N-fertilizer (5 mM KNO3). Both cultivars showed different patterns of NR activity in the analyzed plant organs (leaves, roots, and nodules), which were dependent on the N source. When nitrogen became available to the plant through symbiotic N2 fixation, the patterns of NR activity distribution were different in the two cultivars, with cv. TEGUA showing a higher NR activity in the nodules than in the leaves and roots, and cv. UTRE showing no difference in terms of NR activity among organs. The nitrate and amino acid contents showed a similar trend between the two cultivars, with the highest nitrate content in the leaves of fertilized plants and the highest amino acid content in the nodules. The high nitrate content of the leaves of cv. UTRE indicated the better response of this cultivar to N-fertilizer.

Keywords

Amino acids Bradyrhizobium sp. Nitrate Nitrate reductase Peanut cultivars 

Abbreviations

CFU

Colony-forming units

ICARDA

International Centre of Agricultural Research in the Dry Area

MIRCEN

Microbial Resource Centres

NR

Nitrate reductase

YEM

Yeast extract mannitol

YEMA

Yeast extract mannitol agar

Notes

Acknowledgments

We thank the Secretaría de Ciencia y Técnica, Universidad Nacional de Río Cuarto for providing financial assistance for this research.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Romina Delfini
    • 1
  • Cecilia Belgoff
    • 1
  • Elena Fernández
    • 2
  • Adriana Fabra
    • 1
  • Stella Castro
    • 1
  1. 1.Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y NaturalesUniversidad Nacional de Río CuartoRío CuartoArgentina
  2. 2.Departamento de Producción Vegetal, Facultad de Agronomía y VeterinariaUniversidad Nacional de Río CuartoRío CuartoArgentina

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