Plants Are Calling 9-11 (IMAGE) University of Delaware Caption In studies of Arabidopsis thaliana, also known as mustard weed, a team of researchers at the University of Delaware found that when a plant has its leaf nicked, it plant sends out an emergency alert to neighboring plants, which begin beefing up their defenses. Credit Illustration by Jeff Chase/ University of Delaware Usage Restrictions Must credit Jeff Chase/ University of Delaware 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.