Plant Growth Without Light Control (IMAGE) Helmholtz Association Caption The seedling on the right was fed with a synthetic photoreceptor and opens it cotyledons. In the dark control (left seedling), they remain closed. Credit T. Lamparter, KIT 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.