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Phosphate solubilization by Rhizobium strains.

M Sridevi1, K V Mallaiah

  • 1Department of Microbiology, Acharya Nagarjuna University, Nagarjuna Nagar, 522 510 Andhra Pradesh, India.

Indian Journal of Microbiology
|October 27, 2012
PubMed
Summary
This summary is machine-generated.

This study identified Rhizobium isolates with significant phosphate-solubilizing abilities. The Cassia absus isolate demonstrated the highest tricalcium phosphate solubilization, enhanced by glucose and ammonium sulfate.

Keywords:
Phosphate solubilizationRhizobiumTricalcium phosphate

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Area of Science:

  • Microbiology
  • Agricultural Science
  • Biochemistry

Background:

  • Rhizobium bacteria are crucial for legume symbiosis and nutrient cycling.
  • Phosphate solubilization by soil microbes is vital for plant phosphorus uptake.
  • Investigating phosphate-solubilizing Rhizobium enhances agricultural sustainability.

Purpose of the Study:

  • To assess the phosphate-solubilizing potential of Rhizobium isolates from various legume nodules.
  • To identify optimal carbon and nitrogen sources for enhancing tricalcium phosphate (TCP) solubilization.

Main Methods:

  • Screening of 46 Rhizobium isolates for phosphate solubilization on Pikovskaya's agar medium.
  • Quantification of tricalcium phosphate (TCP) solubilization by selected isolates.
  • Evaluation of different carbon (glucose) and nitrogen (ammonium sulfate) sources for their effect on TCP solubilization.

Main Results:

  • Rhizobium isolates from Cassia absus, Vigna trilobata, and Sesbania sesban exhibited TCP solubilization.
  • The C. absus isolate showed maximum solubilization (620 μg/ml) after 12 days.
  • Glucose and ammonium sulfate significantly enhanced TCP solubilization by the C. absus isolate.

Conclusions:

  • Rhizobium isolates, particularly from C. absus, possess significant phosphate-solubilizing capabilities.
  • Optimizing carbon and nitrogen sources can enhance the efficacy of phosphate-solubilizing Rhizobium.
  • These findings support the use of Rhizobium as biofertilizers to improve phosphorus availability for legumes.