phys.org
A plant hormone's secret passage: Researchers elucidate molecular mechanism of auxin influx
Auxin is the first plant hormone—or "phytohormone"—ever identified, with its discovery dating to the late 19th and early 20th centuries. With its discovery, scientists began to understand how small, self-produced organic molecules could influence physiological processes in plants such as growth, cell division, flowering, fruit ripening, and stress responses.