Rapid Evolution of Heavy Metal Tolerance in Urban Populations of Taraxacum officinale
Gomez-Ariza J, Whitfield C, Kumar A
Urban Ecology
Weeds in your yard or local park may already be quietly evolving in response to pollution, and understanding how plants do this could help scientists engineer cleaner soils and safer urban green spaces.
Dandelions living in city soils contaminated with lead and zinc developed a heritable ability to survive those toxic conditions within just five generations — roughly a decade. Scientists looked at the plants' DNA and found changes in specific genes that help move heavy metals safely within the plant. This is evolution happening in real time, right in our cities, driven by human pollution.
Key Findings
Dandelion populations developed heritable heavy metal tolerance (zinc and lead) within just 5 generations on a decadal timescale.
Whole-genome sequencing revealed parallel selection acting on HMA4 transporter genes across independently evolved urban populations.
The study demonstrates that rapid adaptive evolution to human-caused pollution is possible in common weed species.
chevron_right Technical Summary
Dandelions growing in lead-polluted city soils have evolved genetic resistance to heavy metals in just a few decades — far faster than scientists expected evolution to work. This shows that common plants can adapt to human-made pollution surprisingly quickly.
Abstract Preview
Dandelion populations from lead-contaminated urban soils show heritable zinc and lead tolerance within 5 generations. Whole-genome sequencing identified parallel selection on HMA4 transporter genes...
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Taraxacum is a genus of flowering plants in the family Asteraceae, which consists of species commonly known as dandelions. The scientific and hobby study of the genus is known as taraxacology. The genus has a near-cosmopolitan distribution, absent only from tropical and polar areas. Two of the mo...