Spatial Genetic Structure and Gene Flow in Plant Populations

Spatial genetic structure and gene flow together determine the distribution of genetic diversity within and among plant populations. Spatial genetic structure arises when limited seed and pollen dispersal creates clusters of related individuals, often exhibiting isolation by distance. Gene flow counteracts the effects of genetic drift and local selection by introducing novel alleles, promoting connectivity across landscapes. The interplay of these processes shapes adaptive potential, resilience to environmental change and the capacity for range shifts under climate pressure. Modern molecular markers and analytical methods have revealed fine‐scale patterns of relatedness, quantified dispersal kernels for seeds and pollen, and linked landscape features to barriers or conduits of gene movement. Insights into mating systems, inbreeding depression and historical demography inform conservation strategies by identifying refugial populations, forecasting responses to fragmentation, and guiding provenance selection for restoration.

Research from Nature Portfolio

Recent studies of an endangered dioecious palm have demonstrated that surviving offspring often result from mating among closer relatives than expected at random, suggesting active mate choice for kin. Spatially explicit parentage analyses revealed mean interparent distances of under 30 metres, low correlated paternity and potential benefits of retaining favourable allelic combinations for large‐seed development. These findings underscore the importance of preserving natural pollinator communities and using in situ seed germination to maintain genetic integrity. In another work on a long‐lived conifer, plastid DNA haplotypes delineated three major genetic groups aligned with post‐glacial refugia. Evidence of southward demographic expansion and historical population fluctuations supports the existence of central and southern refugial zones. This phylogeographic framework has been used to propose seed‐collection zones and to inform in situ conservation priorities, ensuring representation of distinct genetic lineages and adaptive potential across the species range.

Spatial Genetic Structure and Gene Flow in Plant Populations publication trend

The graph below shows the total number of articles in spatial genetic structure and gene flow in plant populations across all publications each year (not limited to Nature Index journals).

Technical terms

Spatial genetic structure (SGS): The non‐random spatial distribution of genetic variation within populations due to limited dispersal and demographic processes.

Gene flow: The movement of genes among populations via seed or pollen dispersal, which counteracts genetic drift and promotes connectivity.

Fixation index (FST): A statistic measuring genetic differentiation among populations, reflecting the balance of gene flow and drift.

Inbreeding depression: Reduced fitness of offspring resulting from mating between genetically related individuals, often manifesting as lower survival or growth.

Isolation by distance (IBD): A pattern in which genetic similarity declines with increasing geographic distance due to restricted dispersal.

References

1. Mate-choice for close kin is associated with improved offspring survival in Lodoicea maldivica, the largest-seeded plant in the world. Scientific Reports (2023).
2. Phylogeography of plastid DNA sequences suggests post-glacial southward demographic expansion and the existence of several glacial refugia for Araucaria angustifolia. Scientific Reports (2019).
3. A decade of genetic makeup in the aerial seed bank of a fire-evader tree. Fire Ecology (2024).
4. Inbreeding depression affects the growth of seedlings of an African timber species with a mixed mating reproductive system, Pericopsis elata (Harms) Meeuwen. Heredity (2024).
5. Gene flow and natural selection shape spatial patterns of genes in tree populations: implications for evolutionary processes and applications. Evolutionary Applications (2015).