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  11. Smart Bioinoculants For Arachis Hypogaea: Controlled Release Of Bradyrhizobium And The Role Of Naringin In Symbiosis Enhancement

Smart Bioinoculants for Arachis hypogaea: Controlled Release of Bradyrhizobium and the Role of Naringin in Symbiosis Enhancement

Adriana Belén Cesari1, Natalia Soledad Paulucci1,2, Marta Susana Dardanelli1,2

  • 1Departamento de Biología Molecular, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta Nacional 36, Km 601, Córdoba X5804BYA, Argentina.

Plants (Basel, Switzerland)
|June 13, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Encapsulating Bradyrhizobium with naringin in alginate beads improves peanut nitrogen fixation. This novel method enhances bacterial release and nodulation, offering a sustainable agricultural solution.

Area of Science:

  • Agricultural Science
  • Microbiology
  • Biotechnology

Background:

  • Peanut (Arachis hypogaea L.) is a vital oilseed crop reliant on symbiotic nitrogen fixation by Bradyrhizobium sp.
  • Environmental factors can disrupt this symbiosis, impacting nitrogen fixation efficiency.
  • Flavonoids like naringin (Nar) can influence symbiotic interactions but require stabilization.

Purpose of the Study:

  • To develop encapsulated Bradyrhizobium sp. SEMIA6144 with naringin (Nar) in alginate beads.
  • To enhance flavonoid stability and improve nodulation kinetics in peanuts.
  • To investigate the impact of naringin on bacterial response and symbiotic development.

Main Methods:

  • Synthesis of alginate beads containing Bradyrhizobium sp. SEMIA6144 (Control, Nar-induced, and Nar-co-entrapped).
Keywords:
Bradyrhizobiumalginate beadscontrol releasenaringin

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  • Analysis of bacterial cell mortality, metabolic activity, and membrane fatty acid profiles.
  • Evaluation of bacterial release kinetics and colonization in peanut root exudates.
  • Assessment of nodulation initiation through root hair changes and rosette structure formation.

    • Main Results:

    • Naringin altered bacterial membrane fatty acid profiles, increasing unsaturated fatty acids and reducing saturated ones.
    • Bacterial release from beads followed Fickian diffusion, with enhanced release in peanut root exudates.
    • Nar-treated beads promoted root hair curling, bacterial colonization, and nodule initiation structures.
    • Despite increased cell mortality at higher concentrations, naringin-loaded beads improved symbiotic indicators.

    Conclusions:

    • Encapsulation of Bradyrhizobium sp. SEMIA6144 with naringin in alginate beads is a viable strategy.
    • This approach enhances bacterial release and promotes key stages of peanut nodulation.
    • The findings suggest a promising method for improving symbiotic nitrogen fixation in peanuts.
    peanut (Arachis hypogaea L.)
    symbiosis