This research compared two strains of a beneficial fungus that helps protect plants from harmful fungi. The study found important differences in how these strains respond to light and produce chemical compounds that affect their ability to fight plant diseases. The findings have practical implications for agriculture and plant protection. Impacts on everyday life: • Better understanding of natural plant protection methods could reduce chemical pesticide use • Improved selection of beneficial fungi for organic farming and sustainable agriculture • Development of more effective biological control products for plant diseases • Potential for new natural compounds discovery for various applications • Enhanced crop protection methods that are environmentally friendly