Forensic botany clues: Development of a novel Osmanthus fragrans STR multiplex system.
Liang K, Li P, Zhang W, Shi C, Zhou B, Wu T, Ren F, Guo F.
Forensic Botany
Sweet osmanthus lines the streets, parks, and gardens across much of the world, and now a leaf or twig left behind at a crime scene can be traced back to the exact tree it came from — the same way human DNA places a person at a location.
Researchers built a DNA test for sweet osmanthus, the fragrant flowering shrub common in parks and gardens, that can tell individual plants apart from one another — just like human DNA testing identifies people. They also improved the technique for pulling usable DNA out of tiny plant scraps, like a single crushed leaf. The system was already put to work in two actual criminal investigations, where plant material left at a scene helped crack the case.
Key Findings
The 12-marker system achieves a combined power of discrimination of 1 − 1.0045×10⁻¹⁹ across 273 sampled plants, making accidental matches virtually impossible.
The method reliably detects plant DNA from as little as 50–500 picograms of material and holds up against common soil and blood contaminants (humic acid up to 400 ng/µL, hematin up to 500 µM).
Plant evidence was successfully linked to specific crime scenes in two real-world criminal cases, demonstrating operational forensic value.
chevron_right Technical Summary
Scientists developed a DNA fingerprinting system for sweet osmanthus (fragrant olive) that can identify individual plants from microscopic trace samples. The 12-marker system was validated against real criminal cases, successfully linking plant evidence collected at crime scenes to suspects.
Abstract Preview
Comprehensive research on human DNA genetic markers shows that short tandem repeats (STRs) have found extensive applications in individual identification and kinship testing. Botanical STRs are les...
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Osmanthus fragrans is a species of flowering plant in the family Oleaceae. In English, it is sometimes referred to by the common names sweet osmanthus, sweet olive, tea olive, and fragrant olive. It is native to Assam, Cambodia, China, the Himalayas, Hainan, Japan, Myanmar, Taiwan, Nepal, Thailan...