Abstract
Poplar Cytospora canker, caused by Cytospora chrysosperma, is one of the most destructive and widespread poplar diseases worldwide, especially in northern China. However, our current understanding of its pathogenic mechanisms remains limited. Here, we showed that trehalose biosynthetic genes, such as trehalose-6-phosphate synthase 1 (Tps1), trehalose-6-phosphate phosphatase (Tps2), and the regulatory subunit (Tps3), play important roles in the development and virulence of C. chrysosperma. The targeted deletion mutants showed reduced trehalose synthesis and were defective in hyphal growth and conidiation. Deletion of any of the three genes attenuated virulence in poplar twigs and stronger poplar defense responses were triggered once inoculated by the mutants. Additionally, the mutants exhibited increased sensitivity to H2O2 and cell wall stressors. Taken together, the finding suggests that trehalose biosynthetic genes contribute to fungal development, stress responses, and full virulence in C. chrysosperma.
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