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Updated: Jun 22, 2026

Establishing Fungal Entomopathogens as Endophytes: Towards Endophytic Biological Control

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Published on: April 11, 2013

Plant behavior upon contact with Streptomycetes.

Mika T Tarkka¹, Nina-A Lehr, Rüdiger Hampp

¹UFZ; Department of Soil Ecology; Helmholtz-Centre for Environmental Research; Halle Germany.

Plant Signaling & Behavior

|June 11, 2009

Summary

Root bacteria called streptomycetes can trigger plant defenses, both belowground and aboveground. These microbes also promote beneficial plant symbioses like mycorrhiza by reducing plant defenses.

Keywords:

Streptomyces bacteria biocontrol defence response rhizosphere

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Area of Science:

Plant Pathology
Microbial Ecology
Plant-Microbe Interactions

Background:

Plants possess chemical and anatomical defenses influenced by environmental factors.
Belowground bacteria, specifically streptomycetes, are known to interact with plant roots.

Purpose of the Study:

To investigate how root inoculation with streptomycetes influences plant defense responses.
To explore the role of streptomycetes in facilitating plant root symbioses, such as mycorrhiza and root nodulation.

Main Methods:

Inoculation of plant roots with filamentous gram-positive streptomycetes.
Observation and analysis of induced plant defense responses in roots and leaves.
Assessment of streptomycetes' effects on mycorrhiza formation and root nodulation.

Main Results:

Root inoculation with streptomycetes induces plant defense responses, including priming, in both roots and leaves.
Streptomycetes actively facilitate plant root symbioses, promoting mycorrhiza and root nodulation.
These bacteria enhance mycorrhiza formation by promoting fungal growth and suppressing plant defenses.

Conclusions:

Streptomycetes play a dual role in plant-microbe interactions, capable of inducing defenses while also promoting beneficial symbioses.
Understanding these complex interactions is crucial for agricultural and ecological applications.