Why can dried plant specimens be useful for DNA research?

Dried plant specimens, housed in collections known as herbaria, serve as invaluable sources of genetic material for DNA analysis.12

These specimens are useful for research because they provide a stable, preserved record of plant material that can be accessed long after the original plant was collected—sometimes centuries later. While the DNA within these dried leaves may be partially degraded, modern molecular techniques such as the polymerase chain reaction (PCR) allow scientists to amplify and analyze even small or damaged amounts of genetic material.123

By extracting this DNA, researchers can conduct a variety of critical studies, including:

• Phylogenetic research: Tracing evolutionary relationships between different plant species.1
• Ecological studies: Understanding historical biogeography and the original biodiversity of habitats.12
• Conservation biology: Identifying rare or endangered species and documenting their historic ranges.2

Because herbaria contain specimens from diverse locations and time periods, they provide a unique temporal and spatial perspective that is essential for modern genomic research.12