Genetic Diversity and Population Genetics of Tree Species

Genetic diversity underpins the adaptive capacity and long‐term resilience of tree species across varied ecosystems. Within natural and managed forests, intraspecific variation arises from mutation, recombination and historical demographic events, and is shaped by processes such as gene flow, genetic drift and selection. Population genetics provides the framework to quantify this variation, revealing how spatial structure, mating systems and life‐history traits influence effective population size and connectivity. Advances in high‐throughput sequencing and molecular markers have enabled fine‐scale characterisation of allelic richness, heterozygosity and population differentiation. This knowledge informs conservation strategies for rare or fragmented taxa, guides the restoration of degraded landscapes and aids the development of improved cultivars in forestry and horticulture. By integrating landscape genetics with ecological and climatic data, researchers can predict responses to environmental change, identify genetic corridors for gene exchange and prioritise populations for protection. The global significance of tree genetic diversity extends from carbon sequestration and biodiversity maintenance to cultural and economic benefits, emphasising the importance of robust population genetic assessment in safeguarding forests against accelerating threats.

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Genetic Diversity and Population Genetics of Tree Species publication trend

The graph below shows the total number of articles in genetic diversity and population genetics of tree species across all publications each year (not limited to Nature Index journals).

Technical terms

Genetic diversity: The variety of alleles and genotypes present within and among populations of a species, reflecting its evolutionary potential.

Population structure: The non‐random distribution of genetic variation across geographic or ecological subdivisions, often driven by limited gene flow or selection.

Single nucleotide polymorphism (SNP): A DNA sequence variation occurring at a single nucleotide position among individuals, widely used as a genetic marker.

Restriction‐site associated DNA sequencing (RADseq): A reduced‐representation approach that sequences genomic regions flanking restriction enzyme cut sites to discover and genotype SNPs.

Genotyping‐by‐sequencing (GBS): A high‐throughput method that uses restriction enzymes and multiplexed sequencing to generate genome‐wide marker data.

Microsatellite marker: A co‐dominant molecular marker based on repeated short DNA motifs, used to assess genetic diversity and parentage.

Gene flow: The movement of alleles among populations via pollen, seed or vegetative propagules, counteracting genetic drift and promoting connectivity.

References

1. Genetic diversity analysis of big-bracted dogwood (Cornus florida and C. kousa) cultivars, interspecific hybrids, and wild-collected accessions using RADseq. PLOS ONE (2024).
2. Genetic diversity and population structure of a rare flowering tree endemic to Appalachia, Stewartia ovata. Ecology and Evolution (2024).
3. Microsatellite Loci Reveal High Genetic Diversity, Mutation, and Migration Rates as Invasion Drivers of Callery Pear (Pyrus calleryana) in the Southeastern United States. Frontiers in Genetics (2022).