Genetic Resistance Mechanisms in Albugo-candida Infections

White blister rust caused by the oomycete Albugo candida poses a major threat to Brassicaceae crops and their wild relatives. Genetic resistance underpins sustainable disease management and relies on layered plant immune responses. At the cell surface, pattern recognition receptors detect conserved microbial signatures, whereas intracellular nucleotide-binding leucine-rich repeat (NLR) proteins sense specific pathogen effectors and activate strong defences. Resistance is often race-specific, reflecting a history of host–pathogen coevolution: plants carry diverse R genes that recognise distinct effector repertoires, and pathogens evolve new effectors or mute existing ones to evade detection. In Arabidopsis thaliana, paralogous WRR (White Rust Resistance) loci have emerged as key determinants of broad-spectrum immunity, with allelic variation fine-tuning recognition specificity and breadth. In Brassica crops, introgression from wild or synthetic lines has yielded novel resistance loci that operate across multiple developmental stages. Advances in genomic mapping, effector profiling and functional assays have accelerated the discovery of resistance genes and their cognate effectors, guiding marker-assisted breeding and gene-stacking strategies to achieve durable control of white rust.

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Genetic Resistance Mechanisms in Albugo-candida Infections publication trend

The graph below shows the total number of articles in genetic resistance mechanisms in albugo-candida infections across all publications each year (not limited to Nature Index journals).

Technical terms

Nucleotide-binding leucine-rich repeat (NLR) protein: An intracellular immune receptor that recognises specific pathogen effectors and activates effector-triggered immunity.

Effector: A pathogen-secreted molecule that manipulates host cell processes and may be recognised by plant immune receptors to trigger defence.

Introgression: The incorporation of genetic material from one line or species into another through hybridisation and backcrossing, often used to introduce resistance genes into crops.

Pathogen race: A subgroup of a pathogen species defined by its ability to infect particular host genotypes, reflecting differences in effector repertoires.

R gene pyramiding: The breeding strategy of combining multiple resistance genes in a single plant genotype to enhance durability and spectrum of disease resistance.

References

1. The Arabidopsis WRR4A and WRR4B paralogous NLR proteins both confer recognition of multiple Albugo candida effectors. New Phytologist (2022).
2. Potential Source of Resistance in Introgressed, Mutant and Synthetic Brassica juncea L. Lines against Diverse Isolates of White Rust Pathogen, Albugo candida. Agronomy (2023).
3. Transgressive segregation reveals mechanisms of Arabidopsis immunity to Brassica-infecting races of white rust (Albugo candida). Proceedings of the National Academy of Sciences of the United States of America (2019).