Genomic Insights into Plant-Pathogenic Fungi

Genomic studies of plant-pathogenic fungi have transformed our understanding of how these organisms evolve, interact with their hosts and overcome plant defences. High-quality genome assemblies and comparative analyses have revealed dynamic genome architectures, with core chromosomes housing conserved genes for growth and development, alongside accessory or mini-chromosomes enriched in virulence factors. Effector repertoires, often encoded on these variable chromosomes, mediate host specificity by modulating plant immune responses. Population-level resequencing has uncovered repeat-rich regions and horizontally acquired gene clusters that drive rapid adaptation to new hosts. Transcriptome profiling during infection stages has elucidated staged deployment of antagonistic effectors supporting biotrophic and necrotrophic phases. Collectively, these insights inform strategies for durable disease resistance and targeted control measures in agriculture.

Research from Nature Portfolio

Recent studies have interrogated the genomic basis of lifestyle transitions in closely related fungal species. Comparative genomics of a beneficial root endophyte and its pathogenic relative delineated signatures of adaptation, including contraction of secreted effector repertoires in the mutualist and expansion of chitin-binding and secondary metabolism genes. Transcriptomic analyses under varying phosphate conditions revealed that beneficial strains suppress activation of pathogenicity-related genes when colonising phosphate-starved roots, whereas the pathogen retains full virulence gene expression. This foundational work has established a framework for understanding how subtle genomic shifts underpin the continuum between mutualism and pathogenicity in soil-borne fungi.

Genomic Insights into Plant-Pathogenic Fungi publication trend

The graph below shows the total number of articles in genomic insights into plant-pathogenic fungi across all publications each year (not limited to Nature Index journals).

Technical terms

Effector: A secreted protein that manipulates host cell processes to facilitate fungal infection.

Nonhost resistance: Innate immunity exhibited by an entire plant species against a non-adapted pathogen.

Mini-chromosome: A small, dispensable chromosome enriched in repetitive DNA and virulence genes.

Accessory chromosome: Variably present genomic segments carrying niche-specific or horizontally acquired genes.

Non-ribosomal peptide synthetase (NRPS): A multi-enzyme complex that synthesises secondary metabolites independently of the ribosome.

References

1. Selective deployment of virulence effectors correlates with host specificity in a fungal plant pathogen. New Phytologist (2023).
2. Extracellular perception of multiple novel core effectors from the broad host-range pear anthracnose pathogen Colletotrichum fructicola in the nonhost Nicotiana benthamiana. Horticulture Research (2024).
3. Genome comparisons reveal accessory genes crucial for the evolution of apple Glomerella leaf spot pathogenicity in Colletotrichum fungi. Molecular Plant Pathology (2024).
4. Survival trade-offs in plant roots during colonization by closely related beneficial and pathogenic fungi. Nature Communications (2016).
5. Sequential Delivery of Host-Induced Virulence Effectors by Appressoria and Intracellular Hyphae of the Phytopathogen Colletotrichum higginsianum. PLOS Pathogens (2012).