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The Use of Spiroplasma melliferum as a Model Organism to Study Potential Antimicrobials Against Phytoplasma

Amir Fine1, Luca Galtarossa2, Katrin Janik1

  • 1Functional Genomics, Laimburg Research Centre, Auer/Ora, BZ, Italy.

Methods in Molecular Biology (Clifton, N.J.)
|January 13, 2026
PubMed

Insights

This study introduces Spiroplasma melliferum as a model to test phytoplasma inhibitors. The alamarBlue™ assay efficiently monitors Spiroplasma survival and growth against potential inhibitory agents.

Area of Science:

  • Microbiology
  • Plant Pathology
  • Drug Discovery

Background:

  • Phytoplasmas are plant pathogens causing significant agricultural damage.
  • Cultivable mollicutes like Spiroplasma melliferum serve as valuable model organisms for studying phytoplasma.
  • Assessing inhibitory effects against phytoplasma requires reliable methods for monitoring pathogen viability.

Purpose of the Study:

  • To establish a protocol for using Spiroplasma melliferum as a proxy model for phytoplasma research.
  • To validate the use of the resazurin-based alamarBlue™ dye assay for monitoring Spiroplasma viability.
  • To provide a method for screening inhibitory agents against phytoplasma.

Main Methods:

  • Cultivation of Spiroplasma melliferum.
  • Application of the alamarBlue™ assay for cell viability assessment.
  • Exposure of Spiroplasma cultures to various filtrates, compounds, or substances.

Main Results:

  • The alamarBlue™ assay effectively monitored Spiroplasma survival and growth.
  • The protocol demonstrated the feasibility of using Spiroplasma melliferum to test inhibitory agents.
  • Resazurin reduction correlated with Spiroplasma metabolic activity in the presence of test agents.

Conclusions:

  • Spiroplasma melliferum is a suitable proxy model for phytoplasma research.
  • The alamarBlue™ assay is a reliable and efficient method for assessing the inhibitory effects of agents on Spiroplasma.
  • This protocol facilitates the screening of potential therapeutic compounds against phytoplasma infections.
Keywords:
BiocontrolPhytoplasmaResazurinSpiroplasma melliferum

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