Journal
JOURNAL OF FUNGI
Volume 8, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/jof8080855
Keywords
Cochliobolus heterostrophus; sorting nexin; reproductive development; virulence
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Funding
- Project of International Collaboration Plan in Jilin Province [20210402035GH]
- Inter-governmental International Cooperation Special Project of the National Key R&D Program of China [2019YFE0114200]
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This study reveals the important role of sorting nexins in Cochliobolus heterostrophus, demonstrating their involvement in fungal growth, development, stress adaptation, and virulence.
Sorting nexins are a conserved protein family involved in many cellular processes in fungi, and the function of sorting nexin Snx4 (Atg24) and Snx41 (Atg20) in Cochliobolus heterostrophus was not clear. The Delta Chsnx4 and Delta Chsnx41 mutants were generated by a PCR-based marker method to determine the roles of Snx4 and Snx41 in reproductive development, stress adaption, and virulence in C. heterostrophus. Compared with the wild-type strain, the Delta Chsnx4 and Delta Chsnx41 mutants exhibited obvious changes in vegetative growth and in morphology of conidia. In addition, the conidiation, appressorium formation, and virulence of snx4 and snx41 mutants were dramatically reduced. Moreover, Delta Chsnx4 and Delta Chsnx41 mutants were more sensitive to oxidative stress (menadione and H2O2), cell wall integrity stress (Congo red and calcofluor white), fungicides, and isothiocyanates. All the phenotypes mentioned above were restored in complemented strains. In addition, ChSnx4 and ChSnx41 were proven to interact with each other through yeast two-hybrid. Taken together, these findings indicated that ChSNX4 and ChSNX41 were important for fungal growth, asexual development, stress adaption, and virulence in C. heterostrophus.
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