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Zhu C, Wang W, Wang M, Ruan R, Sun X, He M, Mao C, Li H. Deletion of PdMit1, a homolog of yeast Csg1, affects growth and Ca(2+) sensitivity of the fungus Penicillium digitatum, but does not alter virulence. Res Microbiol 2015; 166:143-52. [PMID: 25725383 PMCID: PMC4393796 DOI: 10.1016/j.resmic.2015.02.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 01/25/2015] [Accepted: 02/02/2015] [Indexed: 11/29/2022]
Abstract
GDP-mannose:inositol-phosphorylceramide (MIPC) and its derivatives are important for Ca(2+) sensitization of Saccharomyces cerevisiae and for the virulence of Candida albicans, but its role in the virulence of plant fungal pathogens remains unclear. In this study, we report the identification and functional characterization of PdMit1, the gene encoding MIPC synthase in Penicillium digitatum, one of the most important pathogens of postharvest citrus fruits. To understand the function of PdMit1, a PdMit1 deletion mutant was generated. Compared to its wild-type control, the PdMit1 deletion mutant exhibited slow radial growth, decreased conidia production and delayed conidial germination, suggesting that PdMit1 is important for the growth of mycelium, sporulation and conidial germination. The PdMit1 deletion mutant also showed hypersensitivity to Ca(2+). Treatment with 250 mmol/l Ca(2+) induced vacuole fusion in the wild-type strain, but not in the PdMit1 deletion mutant. Treatment with 250mmol/lCaCl2 upregulated three Ca(2+)-ATPase genes in the wild-type strain, and this was significantly inhibited in the PdMit1 deletion mutant. These results suggest that PdMit1 may have a role in regulating vacuole fusion and expression of Ca(2+)-ATPase genes by controlling biosynthesis of MIPC, and thereby imparts P. digitatum Ca(2+) tolerance. However, we found that PdMit1 is dispensable for virulence of P. digitatum.
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Affiliation(s)
- Congyi Zhu
- Institute of Biotechnology, Zhejiang University, Hangzhou, Zhejiang, 310058, China; Ministry of Agriculture Key Laboratory of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Weili Wang
- Institute of Biotechnology, Zhejiang University, Hangzhou, Zhejiang, 310058, China; Ministry of Agriculture Key Laboratory of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Mingshuang Wang
- Institute of Biotechnology, Zhejiang University, Hangzhou, Zhejiang, 310058, China; Ministry of Agriculture Key Laboratory of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Ruoxin Ruan
- Institute of Biotechnology, Zhejiang University, Hangzhou, Zhejiang, 310058, China; Ministry of Agriculture Key Laboratory of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Xuepeng Sun
- Institute of Biotechnology, Zhejiang University, Hangzhou, Zhejiang, 310058, China; Ministry of Agriculture Key Laboratory of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Meixian He
- Jinhua Polytechnic, Jinhua, Zhejiang, 321007, China
| | - Cungui Mao
- Department of Medicine and Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY, 11794-8155, USA
| | - Hongye Li
- Institute of Biotechnology, Zhejiang University, Hangzhou, Zhejiang, 310058, China; Ministry of Agriculture Key Laboratory of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
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