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Related Experiment Video

Updated: Jun 8, 2026

Isolation and Selection of Entomopathogenic Fungi from Soil Samples and Evaluation of Fungal Virulence against Insect Pests

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Published on: September 28, 2021

Isolate-specific conidiation in Trichoderma in response to different nitrogen sources.

Johanna M Steyaert¹, Richard J Weld, Alison Stewart

¹Bio-Protection Research Centre, PO Box 84, Lincoln University, Lincoln 7647, New Zealand. johanna.steyaert@lincoln.ac.nz

|October 15, 2010

Summary

Trichoderma species show varied conidiation patterns in response to light and nitrogen. Photoconidiation and injury-induced conidiation are differentially regulated, highlighting species-specific responses in these fungi.

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Viability Assay of Trichoderma stromaticum Conidia Inside Human Peripheral Blood Mononuclear-Derived Macrophages

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Published on: October 20, 2023

Area of Science:

Mycology
Fungal Biology
Biocontrol Agents

Background:

Trichoderma species are known for producing concentric rings of conidia under alternating light/dark conditions.
A single burst of light typically induces a single ring of conidia.
Understanding conidiation regulation is crucial for harnessing Trichoderma's biocontrol potential.

Purpose of the Study:

To investigate conidiation patterns in response to light and mycelial injury across five Trichoderma isolates.
To determine the influence of different nitrogen sources on photoconidiation.
To explore the differential regulation of conidiation in response to environmental stimuli.

Main Methods:

Five Trichoderma isolates (T. hamatum, T. atroviride, T. asperellum, T. virens, T. pleuroticola) were cultured on potato-dextrose agar (PDA).
Conidiation was induced using alternating light/dark cycles and a 15-minute burst of blue light.
Nitrogen sources (primary and secondary) and mycelial injury were employed to assess their effects on conidiation.

Main Results:

All five isolates produced concentric rings under alternating light/dark conditions.
Only T. asperellum and T. virens formed distinct conidial rings after a blue light burst; others showed varied responses (disk-like or broken rings).
Nitrogen status significantly impacted conidiation: primary nitrogen induced disk-like conidiation, while secondary nitrogen resulted in ring formation. Photoconidiation was promoted by primary nitrogen, suggesting a link to nitrogen catabolite repression.

Conclusions:

Conidiation in response to light and injury is differentially regulated among Trichoderma species.
Nitrogen availability plays a critical role in regulating photoconidiation and the competency of Trichoderma to respond to light.
This study provides novel insights into the complex mechanisms governing conidiation in Trichoderma, with implications for their use as biocontrol agents.