Plants Follow the Clock (IMAGE) University of California - Davis Caption Growth in Arabidopsis seedlings is influenced by the plant's internal clock through the plant hormone auxin. Credit Michael Covington/UC-Davis 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.