The Phosphatase VdPtc3 Regulates Virulence in by Interacting with VdAtg1.

Type 2C protein phosphatases regulate various biological processes in eukaryotes. However, their functions in have not been characterized. In this study, homologs VdPtc1, VdPtc3, VdPtc5, VdPtc6, and VdPtc7 were identified in . on the basis of homologous comparison with those in . and are missing in the genome of the XJ592 strain. VdPtc3 is the homolog of Ptc2, Ptc3, and Ptc4 proteins in , implying that VdPtc3 may play versatile functions in . promoted conidium development, melanin, and microsclerotium formation in . The Δ strains showed increased sensitivity to NaCl and sorbitol and augmented the phosphorylation of p38 mitogen-activated protein kinase homolog Hog1 induced by osmotic stress. Besides, the Δ strains also showed milder Verticillium wilt symptom on cotton. Furthermore, VdPtc3 interacts with VdAtg1, which modulates melanin and microsclerotium formation, as well as pathogenicity.