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Species diversity of Cytospora associated with forest canker diseases in Xizang (Tibet), China

Summary

Scientists studying forests in Tibet discovered 23 new species of Cytospora fungi that cause canker diseases in trees like poplars and willows. Using advanced genetic analysis combined with traditional microscopic examination, researchers identified a total of 50 Cytospora species in the region. These fungi cause bark damage and branch death in many important forest trees. Understanding which species are present and how they spread is crucial for protecting Tibet’s valuable forest ecosystems.

Background

Cytospora is a widespread fungal genus causing canker diseases in woody plants worldwide, posing a significant threat to forest health and productivity. Recent molecular phylogenetic studies have clarified Cytospora taxonomy, but species diversity in high-altitude forests of the Xizang (Tibet) Autonomous Region in China has not been systematically studied.

Objective

To investigate the species diversity of Cytospora associated with forest canker diseases in Xizang, China, by integrating morphological characteristics with multilocus DNA phylogenetic analyses to identify and describe Cytospora species present in this region.

Results

The genus Cytospora was divided into 10 species complexes and 12 singletons, with a total of 50 species identified. Among these, 23 species were found to be new to science. New isolates were distributed across various complexes including Ribis SC (26 isolates), Chrysosperma SC (36 isolates), and Leucostoma SC (32 isolates).

Conclusion

This comprehensive study highlights the significant species diversity of Cytospora forest pathogens in Xizang, with substantial undiscovered diversity. The findings provide valuable information for understanding disease ecology and developing targeted disease management strategies in this ecologically important region.
  • Published in:Persoonia,
  • Study Type:Taxonomic and Phylogenetic Study,
  • Source: 10.3114/persoonia.2025.55.10
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