Genetic Resistance Mechanisms Against Cladosporium Fulvum in Tomato Plants

Tomato leaf mould, caused by the biotrophic fungus Cladosporium fulvum, represents a classic gene-for-gene interaction in plant pathology. Resistance in tomato is predominantly conferred by a family of Cf genes encoding cell-surface receptor-like proteins with leucine-rich repeats that recognise specific apoplastic effectors secreted by the pathogen. Upon effector recognition, a hypersensitive response is initiated, leading to localized cell death that restricts fungal growth. Pathogen populations evolve by mutating or deleting avirulence (Avr) genes, thereby evading detection and overcoming single Cf alleles. In response, breeders have utilised wild Solanum accessions to identify novel Cf genes and pyramid multiple resistance loci in elite cultivars. At the molecular level, Cf-mediated immunity engages calcium-dependent protein kinases and phytohormone signalling pathways, notably salicylic acid and jasmonic acid, to orchestrate downstream defences. Structural studies of effectors such as Avr4 have elucidated chitin-binding domains that protect fungal cell walls from plant chitinases, while revealing how mutations uncouple virulence functions from receptor recognition. Genomic comparisons highlight the contribution of repeat-rich regions and gene duplication to effector diversification. Transcriptomic profiling across infection stages has defined a core set of differentially expressed genes that underpin durable resistance and guide marker-assisted selection for sustainable management of leaf mould disease.

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Genetic Resistance Mechanisms Against Cladosporium Fulvum in Tomato Plants publication trend

The graph below shows the total number of articles in genetic resistance mechanisms against cladosporium fulvum in tomato plants across all publications each year (not limited to Nature Index journals).

Technical terms

Cf genes: A family of tomato resistance genes encoding receptor-like proteins that recognise specific C. fulvum effectors.

Avirulence (Avr) proteins: Secreted fungal effectors that, when recognised by a matching Cf receptor, trigger host immunity.

Receptor-like protein (RLP): A membrane-anchored protein lacking a kinase domain, often containing leucine-rich repeats for ligand recognition.

Hypersensitive response (HR): A rapid, localized cell death at the infection site that limits pathogen spread.

Transcriptome analysis: Genome-wide profiling of RNA expression levels to identify differentially expressed genes.

Differentially expressed genes (DEGs): Genes whose expression levels change significantly between treatments or time points.

Leucine-rich repeat (LRR) motif: A protein structural motif involved in protein–protein interactions, common in plant immune receptors.

Phytohormone signalling: Plant hormone-mediated pathways, including salicylic acid and jasmonic acid, coordinating defence responses.

References

1. Molecular mapping of the Cf-10 gene by combining SNP/InDel-index and linkage analysis in tomato (Solanum lycopersicum). BMC Plant Biology (2019).
2. Transcriptome Analysis of the Cf-12-Mediated Resistance Response to Cladosporium fulvum in Tomato. Frontiers in Plant Science (2017).
3. Comparative transcriptome analysis reveals the response mechanism of Cf-16-mediated resistance to Cladosporium fulvum infection in tomato. BMC Plant Biology (2020).
4. Structure of the Cladosporium fulvum Avr4 effector in complex with (GlcNAc)6 reveals the ligand-binding mechanism and uncouples its intrinsic function from recognition by the Cf-4 resistance protein. PLOS Pathogens (2018).
5. Novel Mutations Detected in Avirulence Genes Overcoming Tomato Cf Resistance Genes in Isolates of a Japanese Population of Cladosporium fulvum. PLOS ONE (2015).
6. The Genomes of the Fungal Plant Pathogens Cladosporium fulvum and Dothistroma septosporum Reveal Adaptation to Different Hosts and Lifestyles But Also Signatures of Common Ancestry. PLOS Genetics (2012).