Mechanisms of Symbiotic Engagement (IMAGE) American Phytopathological Society Caption Mechanisms of symbiotic engagement -- three principles by which plants may select for or restrict potential mutualists or pathogens. Credit David Thoms, Yan Liang, and Cara H. Haney Usage Restrictions None 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.