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Mating-Type Genes Control Sexual Reproduction, Conidial Germination, and Virulence in Cochliobolus lunatus
1College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, P.R. China.
Phytopathology
|November 5, 2021
Summary
Mating-type (MAT) genes in Cochliobolus lunatus are crucial for sexual development and virulence. Knockout mutants showed defects in pseudothecia formation and reduced pathogenicity, impacting maize leaf spot disease.
Area of Science:
- Mycology
- Plant Pathology
- Molecular Biology
Background:
- Cochliobolus lunatus causes Curvularia leaf spot in maize.
- Mating-type (MAT) genes regulate sexual reproduction in fungi.
- Understanding MAT gene function is key to controlling fungal pathogens.
Purpose of the Study:
- To investigate the functions of ClMAT1-1-1 and ClMAT1-2-1 in C. lunatus.
- To determine the role of these MAT genes in fungal development and pathogenicity.
Main Methods:
- Southern blot analysis to confirm single copy of MAT genes.
- Gene knockout and complementation to create mutant and restored strains.
- Phenotypic analysis of growth rate, conidia production, sexual development, and virulence.
Main Results:
- MAT genes exist as single copies in the C. lunatus genome.
- Mutant strains exhibited defective sexual development (no pseudothecia) and reduced aerial mycelia and dry weight.
- Virulence and conidial germination were significantly reduced in knockout mutants compared to wild-type.
Conclusions:
- ClMAT1-1-1 and ClMAT1-2-1 are essential for sexual development in C. lunatus.
- MAT genes influence asexual development, cell wall integrity, and osmotic adaptation.
- These genes play a critical role in the pathogenicity of C. lunatus on maize.
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