Barley circadian clock (IMAGE) Heinrich-Heine University Duesseldorf Caption Plants carrying the LWD1 mutation flower earlier in short days than plants that do not carry the mutation (wild-type plants). (Image: HHU/Gesa Helmsorig) Credit HHU/Gesa Helmsorig Usage Restrictions No restrictions. License Public Domain 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.