Genetic Resistance Mechanisms in Leptosphaeria maculans Pathosystem
Summary
The interaction between Leptosphaeria maculans, the causal agent of blackleg disease, and Brassica napus underpins a classic gene-for-gene pathosystem in which host resistance (R) genes recognise specific pathogen avirulence (Avr) effectors. Major R genes confer high levels of specific resistance that can be rapidly eroded by pathogen adaptation, while quantitative resistance underpinned by multiple loci offers more durable but partial protection. At the molecular level, R-gene-mediated defence triggers effector-triggered immunity, often accompanied by localized cell death, whereas quantitative resistance engages a broader array of defence pathways without a hypersensitive response. From the pathogen side, effector gene expression is dynamically regulated by chromatin-based mechanisms and transcription factors, enabling temporal control of virulence programmes. The continual co-evolution of host and pathogen drives allelic diversification within Avr gene clusters, frequently located in repeat-rich genome compartments subjected to repeat-induced point mutations. Advances in genetic mapping, genomics and high-throughput phenotyping have led to the identification of numerous R genes and quantitative trait loci (QTL), guiding breeding strategies such as gene pyramiding and marker-assisted selection. Globally, elucidation of these resistance mechanisms is essential to secure canola yields and to inform integrated disease management in diverse production environments.
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Genetic Resistance Mechanisms in Leptosphaeria maculans Pathosystem publication trend
The graph below shows the total number of articles in genetic resistance mechanisms in leptosphaeria maculans pathosystem across all publications each year (not limited to Nature Index journals).
Technical terms
Effector: A secreted pathogen protein that modulates host defences or physiology to facilitate infection.
Avirulence gene (Avr): A pathogen gene encoding an effector that can be recognised by a corresponding host resistance gene, triggering defence.
Resistance gene (R gene): A host gene encoding a receptor that recognises specific pathogen effectors and initiates immune responses.
Quantitative trait locus (QTL): A genomic region associated with variation in a polygenic trait, such as partial disease resistance.
Chromatin remodelling: The modification of chromatin structure, often via histone marks, to regulate gene expression.
Genome-wide association study (GWAS): A statistical analysis linking genetic markers across the genome to phenotypic variation in a population.
References
- Effector-triggered defence against apoplastic fungal pathogens. Trends in Plant Science (2014).
- Regulation of effector gene expression as concerted waves in Leptosphaeria maculans: a two‐player game. New Phytologist (2024).
- Evolution of Linked Avirulence Effectors in Leptosphaeria maculans Is Affected by Genomic Environment and Exposure to Resistance Genes in Host Plants. PLOS Pathogens (2010).
- DArTseq-Based, High-Throughput Identification of Novel Molecular Markers for the Detection of Blackleg (Leptosphaeria Spp.) Resistance in Rapeseed. International Journal of Molecular Sciences (2024).
- Breeding and management of major resistance genes to stem canker/blackleg in Brassica crops. Theoretical and Applied Genetics (2024).
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