Consulting Editors: Elliot Meyerowitz, Wolf Frommer, Virginia Walbot

Plant growth and development are regulated by the plant hormones, small-molecule metabolites that have evolved signaling functions. Plants also respond with changes in morphology and physiology to a remarkable range of external signals - light, of course, and many others, including temperature, moisture, infection, and touch. For this series, we have invited Q&As on established and less well established plant signaling pathways, reflecting what is known and what is still to be discovered.

We welcome research submissions on the many open questions that remain to be answered in plant signaling.