Waterhemp can drastically reduce corn and soy yields, as seen on the right in a corn field in Essex County. Credit: Julia Kreiner, University of British Columbia
“The genetic variants that help the plant do well in modern agricultural settings have risen to high frequencies remarkably quickly since agricultural intensification in the 1960s,” said first author Dr. Julia Kreiner, a postdoctoral researcher in UBC’s Department of Botany. The findings could inform conservation efforts to preserve natural areas in landscapes dominated by agriculture. Reducing gene flow out of agricultural sites and choosing more isolated natural populations for protection could help limit the evolutionary influence of farms.
Waterhemp occurring in natural habitats, the sandy merging of a lake in southern Illinois. Credit: Julia Kreiner, University of British Columbia Herbicide-resistant mutations were also discovered in natural habitats, albeit at a lower frequency, which raises questions about the costs of these adaptations for plant life in non-agricultural settings. “In the absence of herbicide applications, being resistant can actually be costly to a plant, so the changes happening on the farms are impacting the fitness of the plant in the wild,” said Dr. Kreiner.
Source: Education Headlines (educationheadlines.net)
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