Genetic Diversity and Resistance Mechanisms in Corylus Avellana

European hazelnut (Corylus avellana) is a wind-pollinated, long-lived shrub cultivated across temperate regions for its nutritional and economic value. Studies have revealed a broad genetic base structured by glacial refugia and human selection, with regional lineages corresponding to climatic zones around the Black Sea, the Mediterranean and Atlantic Europe. Whole-genome resequencing and high-density marker surveys have identified patterns of heterozygosity, demographic bottlenecks and admixture between wild and cultivated populations. Adaptive variation is often localised in genomic regions under selection for drought tolerance, cold acclimation or disease resistance. Notably, resistance to eastern filbert blight, a major fungal threat, is conferred by dominant alleles at a single locus on linkage group 6, while quantitative trait loci have been mapped for phenology, budburst timing and nut-quality traits. Marker-assisted breeding has accelerated the pyramiding of resistance alleles, and genomic scans have uncovered selective sweeps associated with biotic and abiotic stress pathways. Conservation of wild germplasm and the integration of diverse landraces remain priorities to sustain future climate-resilient cultivars.

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Genetic Diversity and Resistance Mechanisms in Corylus Avellana publication trend

The graph below shows the total number of articles in genetic diversity and resistance mechanisms in corylus avellana across all publications each year (not limited to Nature Index journals).

Technical terms

Single nucleotide polymorphism (SNP): A single base-pair variation in the DNA sequence among individuals.

Simple sequence repeat (SSR): A short DNA motif repeated in tandem, used as a genetic marker for diversity studies.

Selective sweep: A genomic region where genetic variation is reduced due to recent positive selection on a beneficial allele.

Linkage group: A set of genes or markers on the same chromosome that tend to be inherited together.

Quantitative trait locus (QTL): A genomic region that contributes to variation in a continuous trait such as maturity or yield.

References

1. Population genomics reveals demographic history and selection signatures of hazelnut (Corylus). Horticulture Research (2023).
2. High density SNP mapping and QTL analysis for time of leaf budburst in Corylus avellana L.. PLOS ONE (2018).
3. Genetic diversity and domestication of hazelnut (Corylus avellana L.) in Turkey. Plants People Planet (2020).
4. New Sources of Eastern Filbert Blight Resistance and Simple Sequence Repeat Markers on Linkage Group 6 in Hazelnut (Corylus avellana L.). Frontiers in Plant Science (2021).