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Phylogenetic Analysis of Trichoderma Species Associated with Green Mold Disease on Mushrooms and Two New Pathogens on Ganoderma sichuanense

Summary

Researchers identified a new species of Trichoderma fungus that causes green mold disease in cultivated medicinal mushrooms, particularly Ganoderma sichuanense. Using DNA analysis and genetic comparison, they showed that this new species belongs to a group of Trichoderma fungi that are close relatives of species used for controlling plant diseases. The study suggests this fungus might have potential as a biocontrol agent while currently being problematic for mushroom farmers in China.

Background

Green mold disease caused by Trichoderma species has resulted in severe crop losses on mushroom farms worldwide and poses a serious threat to Ganoderma sichuanense production in China. Trichoderma is a species-rich genus that has been extensively studied for its various applications including enzyme production and biological control. Understanding the specificity of Trichoderma species and their interactions with mushroom hosts is important for disease management.

Objective

This study aimed to identify and characterize new Trichoderma species and pathogens isolated from diseased Ganoderma sichuanense fruiting bodies collected from multiple provinces in China. The researchers sought to establish phylogenetic relationships among Trichoderma species associated with mushroom green mold disease and explore their potential biocontrol value.

Results

A new species, Trichoderma ganodermatigerum sp. nov., was identified belonging to the Harzianum clade, and Trichoderma koningiopsis was identified as a new host record on G. sichuanense. Phylogenetic analysis revealed that T. ganodermatigerum is most closely related to T. amazonicum, and the study documented over forty Trichoderma species associated with mushroom green mold disease with varying host specificities.

Conclusion

The identification of T. ganodermatigerum and T. koningiopsis as pathogens of G. sichuanense expands knowledge of Trichoderma host associations. The new species shows potential as a biocontrol agent due to its parasitic characteristics. Further research on parasitic traits and bioactive compounds could enhance understanding of Trichoderma-mushroom interactions for improved disease management.
  • Published in:Journal of Fungi (Basel),
  • Study Type:Taxonomic Study,
  • Source: 10.3390/jof8070704, PMID: 35887460
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