Genetic Resistance Mechanisms in Cereal Crop Pathosystems

Genetic resistance in cereal crops arises from diverse mechanisms that enable plants to detect and restrain pathogen invasion. Race-specific resistance is typically mediated by single dominant resistance (R) genes coding for immune receptors that recognise pathogen effectors and activate rapid defence responses. In contrast, non-race-specific or adult plant resistance (APR) often involves multiple genes conveying partial, durable protection at later developmental stages. Polygenic quantitative resistance, governed by quantitative trait loci (QTL), combines multiple minor-effect genes to limit pathogen growth and reduce disease severity. Underlying processes include receptor-triggered signalling cascades, programmed cell death, cell-wall fortification, antimicrobial compound production and reactive oxygen species accumulation. Advances in genomics, transcriptomics and gene-editing have accelerated the discovery of novel resistance loci and alleles, informing strategies such as gene stacking, marker-assisted selection and precision breeding. Understanding the molecular evolution of resistance families across species further guides the design of durable resistance under variable pathogen pressures, with global significance for food security and sustainable crop protection.

Research from Nature Portfolio

Recent studies have harnessed high-throughput sequencing to clone previously uncharacterised resistance loci in wheat. By applying a sequencing trait-associated mutations approach, researchers identified a non-canonical gene combining NAM and ZnF-BED domains that confers robust stripe rust resistance when expressed in transgenic lines. Further work on the tandem kinase-pseudokinase family revealed a unique R-gene architecture present across the plant kingdom, shedding light on evolutionary conservation and offering new templates for breeding durable resistance against rust pathogens.

Genetic Resistance Mechanisms in Cereal Crop Pathosystems publication trend

The graph below shows the total number of articles in genetic resistance mechanisms in cereal crop pathosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Pathosystem: The interacting components of a host plant and its pathogen species.

Resistance gene (R-gene): A host gene encoding an immune receptor that recognises specific pathogen effectors and triggers defence responses.

Adult plant resistance (APR): A form of resistance that manifests in mature plants and often provides broad-spectrum, partial protection.

Quantitative trait locus (QTL): A genomic region that contributes to the variation of a quantitative trait, such as disease resistance.

Genome-wide association study (GWAS): A method that links genetic variants across the genome with phenotypic traits by analysing natural populations.

References

1. Sequencing trait-associated mutations to clone wheat rust-resistance gene YrNAM. Nature Communications (2023).
2. Safeguarding wheat yields from cereal fungal invaders in the postgenomic era. Current Opinion in Microbiology (2023).
3. Cloning of the wheat Yr15 resistance gene sheds light on the plant tandem kinase-pseudokinase family. Nature Communications (2018).
4. A Genome-Wide Association Study of Resistance to Stripe Rust (Puccinia striiformis f. sp. tritici) in a Worldwide Collection of Hexaploid Spring Wheat (Triticum aestivum L.). G3: Genes, Genomes, Genetics (2015).
5. Origin, Migration Routes and Worldwide Population Genetic Structure of the Wheat Yellow Rust Pathogen Puccinia striiformis f.sp. tritici. PLOS Pathogens (2014).