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Related Experiment Videos

Acid tolerance in root nodule bacteria.

A R Glenn1, W G Reeve, R P Tiwari

  • 1Centre for Rhizobium Studies, School of Biological Sciences and Biotechnology, Murdoch University, Perth, Australia.

Novartis Foundation Symposium
|April 20, 1999
PubMed
Summary
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Biological nitrogen fixation relies on Rhizobium bacteria, which are sensitive to soil acidity. Researchers identified key genes and regulatory systems, including the ActSR two-component system, enabling Rhizobia to adapt to low pH conditions.

Area of Science:

  • Agricultural Microbiology
  • Plant-Microbe Interactions
  • Bacterial Physiology

Background:

  • Biological nitrogen fixation via legume Rhizobium symbiosis is crucial for global agriculture.
  • Soil acidity significantly impacts legume crop and pasture productivity, often by affecting the Rhizobium symbiont.
  • Rhizobia exhibit an adaptive acid tolerance response (ATR) influenced by calcium concentration, crucial for survival in acidic soils.

Purpose of the Study:

  • To identify genes essential for Rhizobium growth under low pH conditions.
  • To elucidate the regulatory systems governing the adaptive acid tolerance response (ATR) in Rhizobia.
  • To understand how Rhizobia respond to and adapt to external pH stress.

Main Methods:

  • Tn5-mutagenesis and gusA fusions were employed to identify acid-inducible genes.

Related Experiment Videos

  • Proteome analysis was used to analyze gene expression under low pH stress.
  • Identification of regulatory genes and circuits involved in pH response.

    • Main Results:

    • Several genes essential for low pH growth were identified (e.g., actA, actP, exoR, actR, actS).
    • The ActSR two-component sensor-regulator system is critical for inducing the adaptive ATR.
    • Two independent regulatory circuits, involving phrR and an unidentified regulator, control other pH-responsive genes like lpiA.

    Conclusions:

    • Rhizobia possess a complex regulatory network to manage external pH stress.
    • Understanding these acid tolerance mechanisms is vital for improving legume-based agriculture in acidic soils.
    • The identified genes and regulatory systems provide targets for enhancing Rhizobium resilience and function.