Genomic Analysis of Soilborne Fungal Pathogens

Genomic analysis of soilborne fungal pathogens has transformed our understanding of the molecular mechanisms underlying host invasion, adaptation and virulence. High-throughput sequencing approaches now enable the assembly of complex, often heterokaryotic genomes, revealing gene repertoires that include carbohydrate-active enzymes (CAZymes), secreted effectors and detoxification systems. Comparative genomics across isolates and anastomosis groups exposes patterns of gene gain and loss, mobile elements and repeat-induced mutations that underpin host specificity and aggressiveness. Transcriptomic profiling during infection further delineates temporal waves of hydrolase, peptidase and oxidative-stress response genes, as well as novel candidate effectors, providing stage-specific markers of pathogenesis. Integrating secretome predictions with functional assays has identified cell-death inducing proteins and unveiled strategies to manipulate host immunity. Collectively, these genomic insights inform breeding of resistant cultivars, development of targeted biocontrol agents and novel agrochemical strategies, underscoring the global significance of this research for sustainable crop protection.

Research from Nature Portfolio

Comparative secretome analysis across isolates with differing host ranges has uncovered unique suites of secreted proteins, including cell-death inducing effectors, revealing how broad-host and specialist strains deploy distinct virulence arsenals while avoiding host recognition. Time-resolved transcriptomics of a potato-infecting strain during early sprout colonisation has mapped successive peaks of peptidase and cell-wall hydrolase gene expression, alongside previously unannotated candidate effectors, to characterise the necrotrophic lifestyle and pinpoint molecular signatures of infection stages.

Genomic Analysis of Soilborne Fungal Pathogens publication trend

The graph below shows the total number of articles in genomic analysis of soilborne fungal pathogens across all publications each year (not limited to Nature Index journals).

Technical terms

Anastomosis group (AG): Classification of fungal isolates based on hyphal fusion compatibility.

Effector: Secreted protein that alters host physiology or suppresses immunity to facilitate infection.

Secretome: Entire set of proteins secreted by an organism, often enriched in virulence factors.

Comparative genomics: Genome-wide comparison across strains to identify shared and unique genetic features.

CAZyme: Carbohydrate-active enzyme involved in degradation or modification of host cell-wall polysaccharides.

Transcriptomics: Profiling of RNA transcripts to reveal gene expression changes during developmental or infection stages.

References

1. Advances in molecular interactions on the Rhizoctonia solani-sugar beet pathosystem. Fungal Biology Reviews (2023).
2. Identification and characterization of pathogenicity-related genes of Rhizoctonia solani AG3 during tobacco infection. Frontiers in Plant Science (2023).
3. Genome sequencing and comparative genome analysis of Rhizoctonia solani AG-3. Frontiers in Microbiology (2024).
4. Comparative secretome analysis of Rhizoctonia solani isolates with different host ranges reveals unique secretomes and cell death inducing effectors. Scientific Reports (2017).
5. Development of a Rhizoctonia solani AG1-IB Specific Gene Model Enables Comparative Genome Analyses between Phytopathogenic R. solani AG1-IA, AG1-IB, AG3 and AG8 Isolates. PLOS ONE (2015).
6. Necrotrophic lifestyle of Rhizoctonia solani AG3-PT during interaction with its host plant potato as revealed by transcriptome analysis. Scientific Reports (2020).