Durable Disease Resistance in Crop Systems
Summary
Durable disease resistance in crops is the capacity of plant varieties to maintain effective defence against pathogens over extended periods and across diverse environments. It rests on the interplay between host genetics, pathogen biology and deployment strategies. Resistance may be qualitative, governed by single major (R) genes that trigger complete immunity but can be rapidly overcome, or quantitative, conferred by multiple loci that each impart partial, often additive, reduction in pathogen development. Durable resistance typically arises from the strategic integration of both types: pyramiding complementary R genes to delay pathogen adaptation, and incorporating quantitative resistance to reduce selection pressure on pathogens. Beyond genetics, spatial and temporal deployment—through cultivar mixtures, crop rotations and landscape mosaics—modulates epidemic dynamics and evolutionary trajectories of pathogen populations. Advances in high-throughput genotyping, precision phenotyping and epidemiological modelling now enable breeders and agronomists to predict resistance breakdown and to design varieties and cropping schemes that extend protection. Globally, durable resistance underpins food security by reducing reliance on chemical control, lowering production costs and mitigating the environmental impact of intensive agriculture. Concrete examples include enhancement of rust resistance in wheat, blast management in rice and multi-locus resistance in cassava, each illustrating how integrated approaches can deliver long-lasting crop health.
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Durable Disease Resistance in Crop Systems publication trend
The graph below shows the total number of articles in durable disease resistance in crop systems across all publications each year (not limited to Nature Index journals).
Technical terms
Quantitative resistance: Partial, polygenic resistance conferred by multiple loci that reduces pathogen growth and disease severity rather than blocking infection outright.
Major (R) gene: Single, often dominant gene that recognises specific pathogen effectors and triggers strong defence responses, but can be overcome by pathogen evolution.
Pyramiding: Breeding or engineering of a single cultivar to carry multiple resistance genes or quantitative loci to enhance durability of protection.
Cultivar mixture: Spatial deployment of different resistant varieties within the same field to reduce uniform selection pressure on pathogen populations.
Durability: Longevity of effective resistance under practical agricultural conditions, measured by the time before significant breakdown due to pathogen adaptation.
References
- Quantitative Resistance to Plant Pathogens in Pyramiding Strategies for Durable Crop Protection. Frontiers in Plant Science (2017).
- Combining Selective Pressures to Enhance the Durability of Disease Resistance Genes. Frontiers in Plant Science (2016).
- Assessing the durability and efficiency of landscape-based strategies to deploy plant resistance to pathogens. PLOS Computational Biology (2018).
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