Beneficial Soil Bacteria Come to the Rescue (image) University of Delaware Share Print E-Mail Caption Root colonization of Bacillus subtilis increases when the leaves of the plant are attacked by pathogens or treated with flagellin (a protein in the flagellum of bacteria). Credit University of Delaware Usage Restrictions Image must include credit to University of Delaware. Share Print E-Mail 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.