Genetic Diversity and Structure in Coastal Plant Species

Coastal plant species occupy dynamic environments shaped by tides, salt spray and shifting substrates. Genetic diversity within and among populations underpins their capacity to adapt to stressors such as sea-level rise, erosion and habitat fragmentation. Patterns of genetic structure in these taxa arise from seed dispersal via water currents, historical vicariance during glacial cycles and local adaptation to salinity and nutrient gradients. High connectivity may promote gene flow over long distances, whereas geographic barriers and human activities can isolate populations, reducing genetic variation. A thorough understanding of these processes is essential for conservation and restoration efforts, guiding the delineation of management units, informing translocation strategies and preserving the evolutionary potential of coastal flora under environmental change.

Research from Nature Portfolio

Research on an endemic shrub from a remote archipelago has revealed two genetically distinct clusters corresponding to northern and southern island groups. Genotyping across nuclear markers identified admixture in planted populations on one island, where individuals exhibited mixed ancestry. This work highlights the existence of discrete conservation units and cautions that current translocation practices risk genetic contamination between evolutionary lineages, underscoring the need for lineage-specific management.

A study of a freshwater emergent macrophyte previously regarded as a morphological hybrid confirmed its hybrid origin using genome-wide analyses. Sequencing of multiple nuclear loci and chloroplast DNA demonstrated bidirectional but asymmetrical hybridisation, with one parental species acting mainly as maternal donor. All sampled individuals were first-generation hybrids, indicating post-zygotic sterility maintains species integrity. These findings provide a framework for interpreting hybridisation dynamics and their influence on genetic diversity in wetland plant communities.

Genetic Diversity and Structure in Coastal Plant Species publication trend

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

Technical terms

Genetic diversity: The range of genetic variation within and between populations of a species.

Population structure: The organisation of genetic variation across geographic or ecological space.

Gene flow: The exchange of genetic material between populations through dispersal of individuals or gametes.

Haplotype: A specific combination of alleles or sequence variants at contiguous loci on a chromosome.

Single-nucleotide polymorphism (SNP): A DNA sequence variation occurring when a single nucleotide differs between individuals.

References

1. Conservation units and the origin of planted individuals of an endangered endemic species Lobelia boninensis in the Ogasawara Islands. Scientific Reports (2024).
2. Molecular confirmation of the hybrid origin of Sparganium longifolium (Typhaceae). Scientific Reports (2022).
3. Population Structure and Genetic Diversity Analyses Provide New Insight into the Endemic Species Aster spathulifolius Maxim. and Its Evolutionary History. Plants (2023).
4. Phenotypic and genetic variations of endangered Lysimachia maritima at global distribution limit. Global Ecology and Conservation (2024).