Weedy Rice Root System (IMAGE) Washington University in St. Louis Caption New imaging techniques allow researchers to consider how weedy rice plants have repeatedly evolved root systems that may convey a competitive advantage. Credit Christopher Topp, Donald Danforth Plant Science Center Usage Restrictions For editorial purposes License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.