Genetic Resistance Mechanisms in Apple Scab Pathosystem
Summary
Apple scab, caused by the fungus Venturia inaequalis, imposes significant economic and environmental burdens through extensive fungicide use and crop losses. Genetic resistance offers a sustainable alternative by harnessing both qualitative and quantitative defence strategies. Qualitative resistance is mediated by single dominant resistance (R) genes, such as the Rvi series, which encode receptors that recognise specific pathogen effectors and trigger rapid hypersensitive responses. Quantitative resistance arises from multiple polygenic loci (quantitative trait loci, QTL) that modulate basal defence pathways, cell-wall fortification, antioxidant production and phytoalexin accumulation, leading to partial but broadly durable protection. Pyramiding of R genes with complementary recognition spectra, combined with favourable QTL alleles, can delay pathogen adaptation and extend the lifespan of resistant cultivars. Advances in genomics, transcriptomics and phenotyping have revealed complex regulatory networks underpinning both constitutive defences and inducible responses, including hormone signalling (salicylic acid, jasmonic acid), transcriptional reprogramming and metabolic adjustments. Marker-assisted and genomic selection techniques now enable precise introgression of resistance loci from wild Malus relatives into elite germplasm. Functional studies of gene expression dynamics and effector repertoires continue to refine strategies for durable resistance, emphasising the integration of multiple defence layers in global breeding programmes.
Research from Nature Portfolio
No recent Nature Portfolio content available.
Genetic Resistance Mechanisms in Apple Scab Pathosystem publication trend
The graph below shows the total number of articles in genetic resistance mechanisms in apple scab pathosystem across all publications each year (not limited to Nature Index journals).
Technical terms
R gene: A plant gene encoding a receptor protein that recognises a specific pathogen effector and initiates a defence response.
Quantitative trait locus (QTL): A genomic region that contributes to variation in a quantitative trait, such as partial resistance to disease.
Effector: A pathogen-secreted molecule that alters host cell processes to facilitate infection or trigger defence when recognised.
Introgression: The incorporation of a specific gene or genomic region from one genotype or species into another through breeding.
Ontogenic resistance: Age-related increase in plant tissue resistance, often due to constitutive changes in gene expression and metabolism.
References
- Phenotyping, genetics, and “-omics” approaches to unravel and introgress enhanced resistance against apple scab (Venturia inaequalis) in apple cultivars (Malus × domestica). Horticulture Research (2024).
- The Hansen's baccata #2 gene Rvi12_Cd5 confers scab resistance to the susceptible apple cultivar “Gala Galaxy”. The Plant Journal (2024).
- RNA-Seq Analysis Reveals Candidate Genes for Ontogenic Resistance in Malus-Venturia Pathosystem. PLOS ONE (2013).
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.