Plant root round (IMAGE) Salk Institute Caption Plant root cross-section showing iron deficiency signal IMA1 expression (yellow) during iron deficiency (left) and iron deficiency plus simulated bacterial presence (right). Credit Salk Institute Usage Restrictions With credit and related coverage License Original 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.