Comparative Genomics of Plant and Mushroom Pathogenic Fungi for Identification of Conserved Virulence Factors

Abstract

Fungal pathogens pose severe threats to agricultural production and mushroom cultivation, yet comparative genomic analyses across these divergent pathosystems remain limited. This review synthesizes current knowledge on conserved virulence mechanisms shared between phytopathogenic and fungicolous fungi, with emphasis on genomic architectures, carbohydrate-active enzyme repertoires, effector biology, signal transduction, secondary metabolism, and emerging RNAi-based control strategies. Comparative genomics reveals that while plant pathogens possess expanded pectinolytic and cellulolytic enzyme families targeting cellulosic host walls, mushroom pathogens exhibit major expansions in chitinases (GH18), β-glucanases, and secreted peptidases tailored to dismantle fungal cell walls composed of chitin-glucan matrices. Both pathogen groups deploy LysM effector proteins that sequester chitin oligomers to suppress host immunity and protect hyphae from enzymatic hydrolysis, representing a conserved virulence strategy across kingdoms. Functional analyses demonstrate divergence in MAPK signaling requirements, with Pmk1 orthologs essential for plant infection but dispensable for mushroom pathogenicity, reflecting differences in penetration mechanisms. Secondary metabolite arsenals, particularly peptaibols and biosynthetic gene clusters, alongside expanded drug efflux transporters, facilitate niche colonization and chemical warfare. The identification of conserved, essential virulence factors enables targeted disease management through spray-induced gene silencing (SIGS), with validated targets including dicer-like genes, chitin synthases, and cell wall integrity kinases. Advanced nanocarrier delivery systems address environmental stability challenges, promising broad-spectrum control strategies applicable to both crop protection and mushroom cultivation. This comparative framework advances understanding of fungal virulence evolution and facilitates development of sustainable disease management approaches.