Examining urban weed response to elevated salt levels

Roadside lineages of Lamium purpureum and Veronica arvensis from Baltimore, MD show less adverse responses to salt than inner-park lineages, with reduced tissue damage overall.

• Why it matters: Urban stress from road salt is less studied than other city factors, and it is unclear whether local plant populations are adapting across heterogeneous urban salinity gradients.
• What they did: Plants were collected from parks around Baltimore, MD, using maternal lineages from roadside soils versus inner park soils, then tested in germination and greenhouse F1 experiments with salt treatments.
• The result: Germination showed a non-significant trend for Lamium purpureum, greenhouse F1 results showed a lineage difference for Veronica arvensis, and both species had less tissue damage in roadside lineages, warranting F2 confirmation.

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