crop varieties to nowadays mostly being derived from crop-weed hybridization,” Olsen said. “In the last 20 years, weedy rice has gone from being very genetically distinct from U.S. fields,” said Kenneth Olsen, professor of biology at Washington University and senior author on the study. rice farming since the 2000s have led to a complete genetic revolution in the makeup of the weedy rice that infests U.S. weedy rice has persisted through herbicide pressure with the survival of those few plants that outcross, consequently acquiring the herbicide- resistance trait.” “Throughout its nearly 200-year history in the United States, weedy rice had a very low rate of outcrossing with cultivated rice,” said Marshall Wedger, a postdoctoral research associate in biology in Arts & Sciences at Washington University and first author of the study.
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