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Layers of Symbiosis - Visualizing the Termite Hindgut Microbial Community

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Published on: May 28, 2007

Endosymbiosis: the evil within.

Raphael H Valdivia¹, Joseph Heitman

¹Department of Molecular Genetics and Microbiology and Center for Microbial Pathogenesis, Duke University Medical Center, Durham, North Carolina 27710, USA. valdi001@mc.duke.edu <valdi001@mc.duke.edu>

Current Biology : CB

|June 7, 2007

Summary

A novel bacterial endosymbiont of the fungus Rhizopus microsporus not only produces a toxin but also regulates the fungus's ability to create spores. This discovery sheds light on complex fungal-bacterial interactions.

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Area of Science:

Microbiology
Mycology
Symbiotic interactions

Background:

Rhizopus microsporus is a fungal pathogen affecting rice.
Bacterial endosymbionts can influence host traits.
The role of endosymbionts in fungal pathogenicity is not fully understood.

Purpose of the Study:

To investigate the multifaceted role of the bacterial endosymbiont in the symbiosis with Rhizopus microsporus.
To identify novel functions of the endosymbiont beyond toxin production.

Main Methods:

Microscopic analysis of fungal structures.
Genetic analysis of the endosymbiont and host fungus.
Biochemical assays for toxin detection.

Main Results:

The bacterial endosymbiont produces a known pathogenic toxin.
The endosymbiont was found to control sporangia and spore formation in the fungus.
This regulatory function is a newly discovered aspect of the symbiosis.

Conclusions:

The endosymbiont plays a dual role, acting as both a virulence factor and a regulator of fungal development.
This finding deepens our understanding of the complex interplay between microbial endosymbionts and fungal pathogens.
Implications for controlling rice diseases caused by Rhizopus microsporus.