Mushroom-Derived Bioactive Metabolites as Eco-Friendly Antifungal Agents Against Major Crop Diseases

Abstract

Fungal phytopathogens cause devastating yield losses ranging from 20% to 40% in global food crops, with conventional synthetic fungicides facing critical challenges including resistance emergence, environmental toxicity, and regulatory restrictions. Macrofungi (mushrooms) represent an underexploited reservoir of eco-friendly bioactive metabolites with potent antifungal properties. This review comprehensively examines mushroom-derived bioactive compounds as sustainable alternatives for crop disease management, encompassing their chemical diversity, mechanisms of action, key species profiles, production methodologies, and formulation strategies. Mushroom metabolites exhibit remarkable structural diversity, including polyketides (strobilurins), bioactive proteins (Lentin), polysaccharides (β-glucans), triterpenoids (ganoderic acids), and phenolic derivatives. These compounds function through direct antifungal pathways disrupting mitochondrial respiration, compromising cell membrane integrity, and inhibiting spore germination alongside indirect mechanisms that prime plant systemic acquired resistance through salicylic acid and jasmonic acid signaling cascades. Key species including Strobilurus tenacellus, Lentinula edodes, Ganoderma lucidum, and Pleurotus ostreatus demonstrate potent activity against major pathogens such as Pyricularia oryzae, Botrytis cinerea, Fusarium species, and Colletotrichum spp. Biotechnological production via submerged and solid-state fermentation, coupled with advanced nanoencapsulation strategies using biodegradable polymers (chitosan, polycaprolactone, zein), addresses critical stability and field application barriers. Despite promising efficacy, commercialization faces challenges in batch-to-batch standardization, fermentation economics, and regulatory modernization. Integrating mushroom-derived biofungicides within integrated pest management frameworks offers a sustainable pathway to reduce chemical inputs, mitigate resistance development, and enhance global food security while aligning with consumer demand for residue-free agricultural produce.